diff --git a/test/common.py b/test/common.py
index 65fa4c33bd3d..3f366c2d5e53 100644
--- a/test/common.py
+++ b/test/common.py
@@ -2192,7 +2192,7 @@ def make_reftest(self, expected, manually_trigger=False):
     # make sure the pngs used here have no color correction, using e.g.
     #   pngcrush -rem gAMA -rem cHRM -rem iCCP -rem sRGB infile outfile
     reporting = read_file(test_file('browser_reporting.js'))
-    shutil.copyfile(expected, 'expected.png')
+    shutil.copy(expected, 'expected.png')
     create_file('reftest.js', '''
       function doReftest() {
         if (doReftest.done) return;
diff --git a/test/test_browser.py b/test/test_browser.py
index 5a3c4919eb54..e4b32d40b671 100644
--- a/test/test_browser.py
+++ b/test/test_browser.py
@@ -442,7 +442,7 @@ def test_preload_file_with_manual_data_download(self, args):
     create_file('file.txt', 'Hello!')
 
     self.compile_btest('browser/test_manual_download_data.c', ['-sEXIT_RUNTIME', '-o', 'out.js', '--preload-file', 'file.txt@/file.txt'] + args)
-    shutil.copyfile(test_file('browser/test_manual_download_data.html'), 'test_manual_download_data.html')
+    shutil.copy(test_file('browser/test_manual_download_data.html'), '.')
 
     # Move .data file out of server root to ensure that getPreloadedPackage is actually used
     os.mkdir('test')
@@ -758,7 +758,7 @@ def test_sdl_surface_lock_opts(self):
   @also_with_wasmfs
   def test_sdl_image(self):
     # load an image file, get pixel data. Also O2 coverage for --preload-file
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.jpg')
+    shutil.copy(test_file('screenshot.jpg'), '.')
     src = test_file('browser/test_sdl_image.c')
     for dest, dirname, basename in [('screenshot.jpg', '/', 'screenshot.jpg'),
                                     ('screenshot.jpg@/assets/screenshot.jpg', '/assets', 'screenshot.jpg')]:
@@ -769,7 +769,7 @@ def test_sdl_image(self):
 
   @also_with_wasmfs
   def test_sdl_image_jpeg(self):
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.jpeg')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.jpeg')
     self.btest_exit('test_sdl_image.c', args=[
       '--preload-file', 'screenshot.jpeg',
       '-DSCREENSHOT_DIRNAME="/"', '-DSCREENSHOT_BASENAME="screenshot.jpeg"', '--use-preload-plugins',
@@ -777,7 +777,7 @@ def test_sdl_image_jpeg(self):
     ])
 
   def test_sdl_image_webp(self):
-    shutil.copyfile(test_file('screenshot.webp'), 'screenshot.webp')
+    shutil.copy(test_file('screenshot.webp'), '.')
     self.btest_exit('test_sdl_image.c', args=[
       '--preload-file', 'screenshot.webp',
       '-DSCREENSHOT_DIRNAME="/"', '-DSCREENSHOT_BASENAME="screenshot.webp"', '--use-preload-plugins',
@@ -788,7 +788,7 @@ def test_sdl_image_webp(self):
   @also_with_proxying
   def test_sdl_image_prepare(self):
     # load an image file, get pixel data.
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.not')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.not')
     self.reftest('test_sdl_image_prepare.c', 'screenshot.jpg', args=['--preload-file', 'screenshot.not', '-lSDL', '-lGL'], manually_trigger_reftest=True)
 
   @parameterized({
@@ -800,46 +800,46 @@ def test_sdl_image_prepare(self):
   })
   def test_sdl_image_prepare_data(self, args):
     # load an image file, get pixel data.
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.not')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.not')
     self.reftest('test_sdl_image_prepare_data.c', 'screenshot.jpg', args=['--preload-file', 'screenshot.not', '-lSDL', '-lGL'] + args, manually_trigger_reftest=True)
 
   def test_sdl_image_must_prepare(self):
     # load an image file, get pixel data.
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.jpg')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.jpg')
     self.reftest('test_sdl_image_must_prepare.c', 'screenshot.jpg', args=['--preload-file', 'screenshot.jpg', '-lSDL', '-lGL'], manually_trigger_reftest=True)
 
   def test_sdl_stb_image(self):
     # load an image file, get pixel data.
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.not')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.not')
     self.reftest('test_sdl_stb_image.c', 'screenshot.jpg', args=['-sSTB_IMAGE', '--preload-file', 'screenshot.not', '-lSDL', '-lGL'])
 
   def test_sdl_stb_image_bpp(self):
     # load grayscale image without alpha
-    shutil.copyfile(test_file('browser/test_sdl-stb-bpp1.png'), 'screenshot.not')
+    shutil.copy(test_file('browser/test_sdl-stb-bpp1.png'), 'screenshot.not')
     self.reftest('test_sdl_stb_image.c', 'test_sdl-stb-bpp1.png', args=['-sSTB_IMAGE', '--preload-file', 'screenshot.not', '-lSDL', '-lGL'])
 
     # load grayscale image with alpha
     self.clear()
-    shutil.copyfile(test_file('browser/test_sdl-stb-bpp2.png'), 'screenshot.not')
+    shutil.copy(test_file('browser/test_sdl-stb-bpp2.png'), 'screenshot.not')
     self.reftest('test_sdl_stb_image.c', 'test_sdl-stb-bpp2.png', args=['-sSTB_IMAGE', '--preload-file', 'screenshot.not', '-lSDL', '-lGL'])
 
     # load RGB image
     self.clear()
-    shutil.copyfile(test_file('browser/test_sdl-stb-bpp3.png'), 'screenshot.not')
+    shutil.copy(test_file('browser/test_sdl-stb-bpp3.png'), 'screenshot.not')
     self.reftest('test_sdl_stb_image.c', 'test_sdl-stb-bpp3.png', args=['-sSTB_IMAGE', '--preload-file', 'screenshot.not', '-lSDL', '-lGL'])
 
     # load RGBA image
     self.clear()
-    shutil.copyfile(test_file('browser/test_sdl-stb-bpp4.png'), 'screenshot.not')
+    shutil.copy(test_file('browser/test_sdl-stb-bpp4.png'), 'screenshot.not')
     self.reftest('test_sdl_stb_image.c', 'test_sdl-stb-bpp4.png', args=['-sSTB_IMAGE', '--preload-file', 'screenshot.not', '-lSDL', '-lGL'])
 
   def test_sdl_stb_image_data(self):
     # load an image file, get pixel data.
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.not')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.not')
     self.reftest('test_sdl_stb_image_data.c', 'screenshot.jpg', args=['-sSTB_IMAGE', '--preload-file', 'screenshot.not', '-lSDL', '-lGL'])
 
   def test_sdl_stb_image_cleanup(self):
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.not')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.not')
     self.btest_exit('test_sdl_stb_image_cleanup.c', args=['-sSTB_IMAGE', '--preload-file', 'screenshot.not', '-lSDL', '-lGL', '--memoryprofiler'])
 
   @parameterized({
@@ -924,7 +924,7 @@ def test_sdl_key(self, delay, async_, defines):
     self.btest_exit('test_sdl_key.c', 223092870, args=defines + async_ + ['--pre-js', test_file('browser/fake_events.js'), '--pre-js=pre.js', '-lSDL', '-lGL'])
 
   def test_sdl_key_proxy(self):
-    shutil.copyfile(test_file('browser/fake_events.js'), 'fake_events.js')
+    shutil.copy(test_file('browser/fake_events.js'), '.')
     create_file('pre.js', '''
       Module.postRun = () => {
         function doOne() {
@@ -977,7 +977,7 @@ def post():
 
       create_file('test.html', html)
 
-    shutil.copyfile(test_file('browser/fake_events.js'), 'fake_events.js')
+    shutil.copy(test_file('browser/fake_events.js'), '.')
     self.btest_exit('browser/test_keydown_preventdefault_proxy.c', 300, args=['--proxy-to-worker'], post_build=post)
 
   def test_sdl_text(self):
@@ -1211,7 +1211,7 @@ def test_webgl_context_attributes(self):
     # Copy common code file to temporary directory
     filepath = test_file('browser/test_webgl_context_attributes_common.c')
     temp_filepath = os.path.basename(filepath)
-    shutil.copyfile(filepath, temp_filepath)
+    shutil.copy(filepath, temp_filepath)
 
     # testAntiAliasing uses a window-sized buffer on the stack
     self.set_setting('STACK_SIZE', '1MB')
@@ -1380,9 +1380,9 @@ def test_fs_lz4fs_package(self):
       os.mkdir('files')
     except OSError:
       pass
-    shutil.copyfile('file1.txt', Path('files/file1.txt'))
-    shutil.copyfile('file2.txt', Path('files/file2.txt'))
-    shutil.copyfile('file3.txt', Path('files/file3.txt'))
+    shutil.copy('file1.txt', 'files/'))
+    shutil.copy('file2.txt', 'files/'))
+    shutil.copy('file3.txt', 'files/'))
     out = subprocess.check_output([FILE_PACKAGER, 'files.data', '--preload', 'files/file1.txt', 'files/file2.txt', 'files/file3.txt'])
     create_file('files.js', out, binary=True)
     self.btest_exit('fs/test_lz4fs.cpp', 2, args=['--pre-js', 'files.js'])'''
@@ -1440,62 +1440,62 @@ def test_sdl_gl_mapbuffers(self):
 
   @requires_graphics_hardware
   def test_sdl_ogl(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_ogl.c', 'screenshot-gray-purple.png', reference_slack=1,
                  args=['-O2', '--minify=0', '--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins', '-lSDL', '-lGL'])
 
   @requires_graphics_hardware
   def test_sdl_ogl_regal(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_ogl.c', 'screenshot-gray-purple.png', reference_slack=1,
                  args=['-O2', '--minify=0', '--preload-file', 'screenshot.png', '-sUSE_REGAL', '-DUSE_REGAL', '--use-preload-plugins', '-lSDL', '-lGL', '-lc++', '-lc++abi'])
 
   @requires_graphics_hardware
   def test_sdl_ogl_defaultmatrixmode(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_ogl_defaultMatrixMode.c', 'screenshot-gray-purple.png', reference_slack=1,
                  args=['--minify=0', '--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins', '-lSDL', '-lGL'])
 
   @requires_graphics_hardware
   def test_sdl_ogl_p(self):
     # Immediate mode with pointers
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_ogl_p.c', 'screenshot-gray.png', reference_slack=1,
                  args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins', '-lSDL', '-lGL'])
 
   @requires_graphics_hardware
   def test_sdl_ogl_proc_alias(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_ogl_proc_alias.c', 'screenshot-gray-purple.png', reference_slack=1,
                  args=['-O2', '-g2', '-sINLINING_LIMIT', '--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '-sGL_ENABLE_GET_PROC_ADDRESS', '--use-preload-plugins', '-lSDL', '-lGL'])
 
   @requires_graphics_hardware
   def test_sdl_fog_simple(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_fog_simple.c', 'screenshot-fog-simple.png',
                  args=['-O2', '--minify=0', '--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins', '-lSDL', '-lGL'])
 
   @requires_graphics_hardware
   def test_sdl_fog_negative(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_fog_negative.c', 'screenshot-fog-negative.png',
                  args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins', '-lSDL', '-lGL'])
 
   @requires_graphics_hardware
   def test_sdl_fog_density(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_fog_density.c', 'screenshot-fog-density.png',
                  args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins', '-lSDL', '-lGL'])
 
   @requires_graphics_hardware
   def test_sdl_fog_exp2(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_fog_exp2.c', 'screenshot-fog-exp2.png',
                  args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins', '-lSDL', '-lGL'])
 
   @requires_graphics_hardware
   def test_sdl_fog_linear(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_fog_linear.c', 'screenshot-fog-linear.png', reference_slack=1,
                  args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins', '-lSDL', '-lGL'])
 
@@ -1682,7 +1682,7 @@ def test_glgears_long(self, args):
     'full_944': ('hello_world_gles_full_944.c',),
   })
   def test_glgears_animation(self, filename):
-    shutil.copyfile(test_file('browser/fake_events.js'), 'fake_events.js')
+    shutil.copy(test_file('browser/fake_events.js'), '.')
     args = ['-o', 'something.html',
             '-DHAVE_BUILTIN_SINCOS', '-sGL_TESTING', '-lGL', '-lglut',
             '--shell-file', test_file('hello_world_gles_shell.html')]
@@ -1723,11 +1723,11 @@ def book_path(path):
       basename = os.path.basename(program)
       args = ['-lGL', '-lEGL', '-lX11']
       if basename == 'CH10_MultiTexture.o':
-        shutil.copyfile(book_path('Chapter_10/MultiTexture/basemap.tga'), 'basemap.tga')
-        shutil.copyfile(book_path('Chapter_10/MultiTexture/lightmap.tga'), 'lightmap.tga')
+        shutil.copy(book_path('Chapter_10/MultiTexture/basemap.tga'), '.')
+        shutil.copy(book_path('Chapter_10/MultiTexture/lightmap.tga'), '.')
         args += ['--preload-file', 'basemap.tga', '--preload-file', 'lightmap.tga']
       elif basename == 'CH13_ParticleSystem.o':
-        shutil.copyfile(book_path('Chapter_13/ParticleSystem/smoke.tga'), 'smoke.tga')
+        shutil.copy(book_path('Chapter_13/ParticleSystem/smoke.tga'), '.')
         args += ['--preload-file', 'smoke.tga', '-O2'] # test optimizations and closure here as well for more coverage
 
       self.reftest(program, book_path(basename.replace('.o', '.png')), args=args)
@@ -1739,9 +1739,9 @@ def book_path(path):
     'full_es3': (['-sFULL_ES3'],)
   })
   def test_gles2_emulation(self, args):
-    shutil.copyfile(test_file('third_party/glbook/Chapter_10/MultiTexture/basemap.tga'), 'basemap.tga')
-    shutil.copyfile(test_file('third_party/glbook/Chapter_10/MultiTexture/lightmap.tga'), 'lightmap.tga')
-    shutil.copyfile(test_file('third_party/glbook/Chapter_13/ParticleSystem/smoke.tga'), 'smoke.tga')
+    shutil.copy(test_file('third_party/glbook/Chapter_10/MultiTexture/basemap.tga'), '.')
+    shutil.copy(test_file('third_party/glbook/Chapter_10/MultiTexture/lightmap.tga'), '.')
+    shutil.copy(test_file('third_party/glbook/Chapter_13/ParticleSystem/smoke.tga'), '.')
 
     for source, reference in [
       ('third_party/glbook/Chapter_2/Hello_Triangle/Hello_Triangle_orig.c', 'third_party/glbook/CH02_HelloTriangle.png'),
@@ -1787,7 +1787,7 @@ def setup():
     setup()
     ensure_dir('sub')
     self.run_process([FILE_PACKAGER, 'sub/test.data', '--preload', 'file1.txt', 'file2.txt'], stdout=open('script2.js', 'w'))
-    shutil.copyfile(Path('sub/test.data'), 'test.data')
+    shutil.copy(Path('sub/test.data'), '.')
     self.btest_exit('test_emscripten_async_load_script.c', args=['-sFORCE_FILESYSTEM'])
 
   def test_emscripten_api_infloop(self):
@@ -1795,7 +1795,7 @@ def test_emscripten_api_infloop(self):
 
   @also_with_wasmfs
   def test_emscripten_fs_api(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png') # preloaded *after* run
+    shutil.copy(test_file('screenshot.png'), '.') # preloaded *after* run
     self.btest_exit('emscripten_fs_api_browser.c', assert_returncode=1, args=['-lSDL'])
 
   def test_emscripten_fs_api2(self):
@@ -1891,24 +1891,24 @@ def test_gl_textures(self, args):
   @requires_graphics_hardware
   def test_gl_ps(self):
     # pointers and a shader
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('gl_ps.c', 'gl_ps.png', args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '-lGL', '-lSDL', '--use-preload-plugins'], reference_slack=1)
 
   @requires_graphics_hardware
   def test_gl_ps_packed(self):
     # packed data that needs to be strided
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('gl_ps_packed.c', 'gl_ps.png', args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '-lGL', '-lSDL', '--use-preload-plugins'], reference_slack=1)
 
   @requires_graphics_hardware
   def test_gl_ps_strides(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('gl_ps_strides.c', 'gl_ps_strides.png', args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '-lGL', '-lSDL', '--use-preload-plugins'])
 
   @requires_graphics_hardware
   @also_with_proxying
   def test_gl_ps_worker(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('gl_ps_worker.c', 'gl_ps.png', args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '-lGL', '-lSDL', '--use-preload-plugins'], reference_slack=1)
 
   @requires_graphics_hardware
@@ -2128,7 +2128,7 @@ def test_sdl_create_rgb_surface_from(self):
     self.reftest('test_sdl_create_rgb_surface_from.c', 'test_sdl_create_rgb_surface_from.png', args=['-lSDL', '-lGL'])
 
   def test_sdl_rotozoom(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl_rotozoom.c', 'test_sdl_rotozoom.png', args=['--preload-file', 'screenshot.png', '--use-preload-plugins', '-lSDL', '-lGL'], reference_slack=3)
 
   def test_sdl_gfx_primitives(self):
@@ -2171,17 +2171,17 @@ def test_sdl_free_screen(self):
 
   @requires_graphics_hardware
   def test_glbegin_points(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('glbegin_points.c', 'glbegin_points.png', args=['--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '-lGL', '-lSDL', '--use-preload-plugins'])
 
   @requires_graphics_hardware
   def test_s3tc(self):
-    shutil.copyfile(test_file('screenshot.dds'), 'screenshot.dds')
+    shutil.copy(test_file('screenshot.dds'), '.')
     self.reftest('s3tc.c', 's3tc.png', args=['--preload-file', 'screenshot.dds', '-sLEGACY_GL_EMULATION', '-lGL', '-lSDL'])
 
   @requires_graphics_hardware
   def test_s3tc_ffp_only(self):
-    shutil.copyfile(test_file('screenshot.dds'), 'screenshot.dds')
+    shutil.copy(test_file('screenshot.dds'), '.')
     self.reftest('s3tc.c', 's3tc.png', args=['--preload-file', 'screenshot.dds', '-sLEGACY_GL_EMULATION', '-sGL_FFP_ONLY', '-lGL', '-lSDL'])
 
   @requires_graphics_hardware
@@ -2190,7 +2190,7 @@ def test_s3tc_ffp_only(self):
     'subimage': (['-DTEST_TEXSUBIMAGE'],),
   })
   def test_anisotropic(self, args):
-    shutil.copyfile(test_file('browser/water.dds'), 'water.dds')
+    shutil.copy(test_file('browser/water.dds'), '.')
     self.reftest('test_anisotropic.c', 'test_anisotropic.png', reference_slack=2, args=['--preload-file', 'water.dds', '-sLEGACY_GL_EMULATION', '-lGL', '-lSDL', '-Wno-incompatible-pointer-types'] + args)
 
   @requires_graphics_hardware
@@ -2813,7 +2813,7 @@ def test_glfw3_hi_dpi_aware(self):
   @also_with_wasm2js
   def test_sdl2_image(self):
     # load an image file, get pixel data. Also O2 coverage for --preload-file
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.jpg')
+    shutil.copy(test_file('screenshot.jpg'), '.')
 
     for dest, dirname, basename in [('screenshot.jpg', '/', 'screenshot.jpg'),
                                     ('screenshot.jpg@/assets/screenshot.jpg', '/assets', 'screenshot.jpg')]:
@@ -2827,7 +2827,7 @@ def test_sdl2_image(self):
 
   @requires_graphics_hardware
   def test_sdl2_image_jpeg(self):
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.jpeg')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.jpeg')
     self.btest_exit('test_sdl2_image.c', 600, args=[
       '--preload-file', 'screenshot.jpeg',
       '-DSCREENSHOT_DIRNAME="/"', '-DSCREENSHOT_BASENAME="screenshot.jpeg"',
@@ -2837,8 +2837,8 @@ def test_sdl2_image_jpeg(self):
   @also_with_wasmfs
   @requires_graphics_hardware
   def test_sdl2_image_formats(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.jpg')
+    shutil.copy(test_file('screenshot.png'), '.')
+    shutil.copy(test_file('screenshot.jpg'), '.')
     self.btest_exit('test_sdl2_image.c', 512, args=[
       '--preload-file', 'screenshot.png',
       '-DSCREENSHOT_DIRNAME="/"', '-DSCREENSHOT_BASENAME="screenshot.png"', '-DNO_PRELOADED',
@@ -2972,13 +2972,13 @@ def test_sdl2_swsurface(self):
   @requires_graphics_hardware
   def test_sdl2_image_prepare(self):
     # load an image file, get pixel data.
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.not')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.not')
     self.reftest('test_sdl2_image_prepare.c', 'screenshot.jpg', args=['--preload-file', 'screenshot.not', '-sUSE_SDL=2', '-sUSE_SDL_IMAGE=2'], manually_trigger_reftest=True)
 
   @requires_graphics_hardware
   def test_sdl2_image_prepare_data(self):
     # load an image file, get pixel data.
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.not')
+    shutil.copy(test_file('screenshot.jpg'), 'screenshot.not')
     self.reftest('test_sdl2_image_prepare_data.c', 'screenshot.jpg', args=['--preload-file', 'screenshot.not', '-sUSE_SDL=2', '-sUSE_SDL_IMAGE=2'], manually_trigger_reftest=True)
 
   @requires_graphics_hardware
@@ -3025,31 +3025,31 @@ def test_sdl2_glalphatest(self):
 
   @requires_graphics_hardware
   def test_sdl2_fog_simple(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl2_fog_simple.c', 'screenshot-fog-simple.png',
                  args=['-sUSE_SDL=2', '-sUSE_SDL_IMAGE=2', '-O2', '--minify=0', '--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins'])
 
   @requires_graphics_hardware
   def test_sdl2_fog_negative(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl2_fog_negative.c', 'screenshot-fog-negative.png',
                  args=['-sUSE_SDL=2', '-sUSE_SDL_IMAGE=2', '--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins'])
 
   @requires_graphics_hardware
   def test_sdl2_fog_density(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl2_fog_density.c', 'screenshot-fog-density.png',
                  args=['-sUSE_SDL=2', '-sUSE_SDL_IMAGE=2', '--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins'])
 
   @requires_graphics_hardware
   def test_sdl2_fog_exp2(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl2_fog_exp2.c', 'screenshot-fog-exp2.png',
                  args=['-sUSE_SDL=2', '-sUSE_SDL_IMAGE=2', '--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins'])
 
   @requires_graphics_hardware
   def test_sdl2_fog_linear(self):
-    shutil.copyfile(test_file('screenshot.png'), 'screenshot.png')
+    shutil.copy(test_file('screenshot.png'), '.')
     self.reftest('test_sdl2_fog_linear.c', 'screenshot-fog-linear.png', reference_slack=1,
                  args=['-sUSE_SDL=2', '-sUSE_SDL_IMAGE=2', '--preload-file', 'screenshot.png', '-sLEGACY_GL_EMULATION', '--use-preload-plugins'])
 
@@ -3078,7 +3078,7 @@ def test_sdl2_ttf_rtl(self):
                  args=['-O2', '-sUSE_SDL=2', '-sUSE_SDL_TTF=2', '--embed-file', 'NotoNaskhArabic-Regular.ttf'])
 
   def test_sdl2_custom_cursor(self):
-    shutil.copyfile(test_file('cursor.bmp'), 'cursor.bmp')
+    shutil.copy(test_file('cursor.bmp'), '.')
     self.btest_exit('test_sdl2_custom_cursor.c', args=['--preload-file', 'cursor.bmp', '-sUSE_SDL=2'])
 
   def test_sdl2_misc(self):
@@ -3098,7 +3098,7 @@ def test_sdl2_misc_via_object(self):
   })
   @requires_sound_hardware
   def test_sdl2_mixer_wav(self, flags):
-    shutil.copyfile(test_file('sounds/the_entertainer.wav'), 'sound.wav')
+    shutil.copy(test_file('sounds/the_entertainer.wav'), 'sound.wav')
     self.btest_exit('test_sdl2_mixer_wav.c', args=['--preload-file', 'sound.wav'] + flags)
 
   @parameterized({
@@ -3111,7 +3111,7 @@ def test_sdl2_mixer_wav(self, flags):
   })
   @requires_sound_hardware
   def test_sdl2_mixer_music(self, formats, flags, music_name):
-    shutil.copyfile(test_file('sounds', music_name), music_name)
+    shutil.copy(test_file('sounds', music_name), '.')
     args = [
       '--preload-file', music_name,
       '-DSOUND_PATH="%s"' % music_name,
@@ -3392,7 +3392,7 @@ def test_dylink(self, args):
       }
     ''')
     self.emcc('side.c', ['-sSIDE_MODULE', '-O2', '-o', 'side.wasm'])
-    self.btest_exit(self.in_dir('main.c'), args=['-sMAIN_MODULE=2', '-O2', 'side.wasm'] + args)
+    self.btest_exit('main.c', args=['-sMAIN_MODULE=2', '-O2', 'side.wasm'] + args)
 
   def test_dlopen_async(self):
     create_file('side.c', 'int foo = 42;\n')
@@ -3447,7 +3447,7 @@ def do_run(src, expected_output, emcc_args):
       # --proxy-to-worker only on main
       if inworker:
         emcc_args += ['--proxy-to-worker']
-      self.btest_exit(self.in_dir('test_dylink_dso_needed.c'), args=['--post-js', 'post.js'] + emcc_args)
+      self.btest_exit('test_dylink_dso_needed.c', args=['--post-js', 'post.js'] + emcc_args)
 
     self._test_dylink_dso_needed(do_run)
 
@@ -3477,7 +3477,7 @@ def test_dylink_glemu(self):
     ''')
     self.emcc('side.c', ['-sSIDE_MODULE', '-O2', '-o', 'side.wasm', '-lSDL'])
 
-    self.btest_exit(self.in_dir('main.c'), args=['-sMAIN_MODULE=2', '-O2', '-sLEGACY_GL_EMULATION', '-lSDL', '-lGL', 'side.wasm'])
+    self.btest_exit('main.c', args=['-sMAIN_MODULE=2', '-O2', '-sLEGACY_GL_EMULATION', '-lSDL', '-lGL', 'side.wasm'])
 
   def test_dylink_many(self):
     # test asynchronously loading two side modules during startup
@@ -3499,7 +3499,7 @@ def test_dylink_many(self):
     ''')
     self.emcc('side1.c', ['-sSIDE_MODULE', '-o', 'side1.wasm'])
     self.emcc('side2.c', ['-sSIDE_MODULE', '-o', 'side2.wasm'])
-    self.btest_exit(self.in_dir('main.c'), args=['-sMAIN_MODULE=2', 'side1.wasm', 'side2.wasm'])
+    self.btest_exit('main.c', args=['-sMAIN_MODULE=2', 'side1.wasm', 'side2.wasm'])
 
   def test_dylink_pthread_many(self):
     # Test asynchronously loading two side modules during startup
@@ -4005,7 +4005,7 @@ def test_main_thread_async_em_asm(self):
     self.btest_exit('core/test_main_thread_async_em_asm.cpp', args=['-O3', '-pthread', '-sPROXY_TO_PTHREAD', '-sASSERTIONS'])
 
   def test_main_thread_em_asm_blocking(self):
-    shutil.copyfile(test_file('browser/test_em_asm_blocking.html'), 'page.html')
+    shutil.copy(test_file('browser/test_em_asm_blocking.html'), 'page.html')
 
     self.compile_btest('browser/test_em_asm_blocking.cpp', ['-O2', '-o', 'wasm.js', '-pthread', '-sPROXY_TO_PTHREAD', '-sEXIT_RUNTIME'])
     self.run_browser('page.html', '/report_result?exit:8')
@@ -4087,7 +4087,7 @@ def test_manual_wasm_instantiate(self, args):
       if self.is_2gb() or self.is_4gb():
         self.skipTest('asan doesnt support GLOBAL_BASE')
     self.compile_btest('manual_wasm_instantiate.cpp', ['-o', 'manual_wasm_instantiate.js'] + args)
-    shutil.copyfile(test_file('manual_wasm_instantiate.html'), 'manual_wasm_instantiate.html')
+    shutil.copy(test_file('manual_wasm_instantiate.html'), '.')
     self.run_browser('manual_wasm_instantiate.html', '/report_result?1')
 
   def test_wasm_locate_file(self):
@@ -4388,7 +4388,7 @@ def test_fetch_to_memory(self):
                     args=['-sFETCH_DEBUG', '-sFETCH', '-DFILE_DOES_NOT_EXIST'])
 
     # Test the positive case when the file URL exists. (http 200)
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     for arg in ([], ['-sFETCH_SUPPORT_INDEXEDDB=0']):
       self.btest_exit('fetch/test_fetch_to_memory.cpp',
                       args=['-sFETCH_DEBUG', '-sFETCH'] + arg)
@@ -4400,26 +4400,26 @@ def test_fetch_to_memory(self):
   @no_firefox('https://github.com/emscripten-core/emscripten/issues/16868')
   @also_with_wasm2js
   def test_fetch_from_thread(self, args):
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     self.btest_exit('fetch/test_fetch_from_thread.cpp',
                     args=args + ['-pthread', '-sPROXY_TO_PTHREAD', '-sFETCH_DEBUG', '-sFETCH', '-DFILE_DOES_NOT_EXIST'])
 
   @also_with_wasm2js
   def test_fetch_to_indexdb(self):
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     self.btest_exit('fetch/test_fetch_to_indexeddb.cpp', args=['-sFETCH_DEBUG', '-sFETCH'])
 
   # Tests emscripten_fetch() usage to persist an XHR into IndexedDB and subsequently load up from there.
   @also_with_wasm2js
   def test_fetch_cached_xhr(self):
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     self.btest_exit('fetch/test_fetch_cached_xhr.cpp', args=['-sFETCH_DEBUG', '-sFETCH'])
 
   # Tests that response headers get set on emscripten_fetch_t values.
   @no_firefox('https://github.com/emscripten-core/emscripten/issues/16868')
   @also_with_wasm2js
   def test_fetch_response_headers(self):
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     self.btest_exit('fetch/test_fetch_response_headers.cpp', args=['-sFETCH_DEBUG', '-sFETCH', '-pthread', '-sPROXY_TO_PTHREAD'])
 
   # Test emscripten_fetch() usage to stream a XHR in to memory without storing the full file in memory
@@ -4441,7 +4441,7 @@ def test_fetch_headers_received(self):
     self.btest_exit('fetch/test_fetch_headers_received.c', args=['-sFETCH_DEBUG', '-sFETCH'])
 
   def test_fetch_xhr_abort(self):
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     self.btest_exit('fetch/test_fetch_xhr_abort.cpp', args=['-sFETCH_DEBUG', '-sFETCH'])
 
   # Tests emscripten_fetch() usage in synchronous mode when used from the main
@@ -4449,20 +4449,20 @@ def test_fetch_xhr_abort(self):
   @no_firefox('https://github.com/emscripten-core/emscripten/issues/16868')
   @also_with_wasm2js
   def test_fetch_sync_xhr(self):
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     self.btest_exit('fetch/test_fetch_sync_xhr.cpp', args=['-sFETCH_DEBUG', '-sFETCH', '-pthread', '-sPROXY_TO_PTHREAD'])
 
   # Tests synchronous emscripten_fetch() usage from pthread
   @no_firefox('https://github.com/emscripten-core/emscripten/issues/16868')
   def test_fetch_sync(self):
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     self.btest_exit('fetch/test_fetch_sync.c', args=['-sFETCH', '-pthread', '-sPROXY_TO_PTHREAD'])
 
   # Tests that the Fetch API works for synchronous XHRs when used with --proxy-to-worker.
   @no_firefox('https://github.com/emscripten-core/emscripten/issues/16868')
   @also_with_wasm2js
   def test_fetch_sync_xhr_in_proxy_to_worker(self):
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     self.btest_exit('fetch/test_fetch_sync_xhr.cpp',
                     args=['-sFETCH_DEBUG', '-sFETCH', '--proxy-to-worker'])
 
@@ -4472,7 +4472,7 @@ def test_fetch_idb_store(self):
 
   @disabled('https://github.com/emscripten-core/emscripten/issues/16746')
   def test_fetch_idb_delete(self):
-    shutil.copyfile(test_file('gears.png'), 'gears.png')
+    shutil.copy(test_file('gears.png'), '.')
     self.btest_exit('fetch/test_fetch_idb_delete.cpp', args=['-pthread', '-sFETCH_DEBUG', '-sFETCH', '-sWASM=0', '-sPROXY_TO_PTHREAD'])
 
   def test_fetch_post(self):
@@ -4528,7 +4528,7 @@ def test_emscripten_get_device_pixel_ratio(self, args):
     'mt': (['-pthread', '-sPROXY_TO_PTHREAD'],),
   })
   def test_pthread_run_script(self, args):
-    shutil.copyfile(test_file('pthread/foo.js'), 'foo.js')
+    shutil.copy(test_file('pthread/foo.js'), '.')
     self.btest_exit('pthread/test_pthread_run_script.c', args=['-O3'] + args)
 
   # Tests emscripten_set_canvas_element_size() and OffscreenCanvas functionality in different build configurations.
@@ -4615,7 +4615,7 @@ def test_load_js_from_blob_with_pthreads(self):
     # Now run the test with the JS file renamed and with its content
     # stored in Module['mainScriptUrlOrBlob'].
     shutil.move('out.js', 'hello_thread_with_blob_url.js')
-    shutil.copyfile(test_file('pthread/main_js_as_blob_loader.html'), 'hello_thread_with_blob_url.html')
+    shutil.copy(test_file('pthread/main_js_as_blob_loader.html'), 'hello_thread_with_blob_url.html')
     self.run_browser('hello_thread_with_blob_url.html', '/report_result?exit:0')
 
   # Tests that SINGLE_FILE works as intended in generated HTML (with and without Worker)
@@ -4925,7 +4925,7 @@ def test_wasm2js_fallback_on_wasm_compilation_failure(self, args):
 
     # Restore the .wasm.js file, then corrupt the .wasm file, that should trigger the Wasm2js fallback to run
     os.rename('test.wasm.js.unused', 'test.wasm.js')
-    shutil.copyfile('test.js', 'test.wasm')
+    shutil.copy('test.js', 'test.wasm')
     self.run_browser('test.html', '/report_result?exit:0')
 
   def test_system(self):
@@ -5373,7 +5373,7 @@ def test_webpack(self, es6):
     with utils.chdir('webpack'):
       self.compile_btest('hello_world.c', ['-sEXIT_RUNTIME', '-sMODULARIZE', '-sENVIRONMENT=web,worker', '-o', outfile])
       self.run_process(shared.get_npm_cmd('webpack') + ['--mode=development', '--no-devtool'])
-    shutil.copyfile('webpack/src/hello.wasm', 'webpack/dist/hello.wasm')
+    shutil.copy('webpack/src/hello.wasm', 'webpack/dist/')
     self.run_browser('webpack/dist/index.html', '/report_result?exit:0')
 
   def test_fetch_polyfill_preload(self):
diff --git a/test/test_core.py b/test/test_core.py
index c2ce1129731f..a040f44a7832 100644
--- a/test/test_core.py
+++ b/test/test_core.py
@@ -556,7 +556,7 @@ def test_core_types(self):
 
   def test_cube2md5(self):
     self.emcc_args += ['--embed-file', 'cube2md5.txt']
-    shutil.copyfile(test_file('cube2md5.txt'), 'cube2md5.txt')
+    shutil.copy(test_file('cube2md5.txt'), '.')
     self.do_run_in_out_file_test('cube2md5.cpp', assert_returncode=NON_ZERO)
 
   @also_with_standalone_wasm()
@@ -1155,7 +1155,7 @@ def test_exceptions_allowed(self):
     size = os.path.getsize('test_exceptions_allowed.js')
     if self.is_wasm():
       size += os.path.getsize('test_exceptions_allowed.wasm')
-    shutil.copyfile('test_exceptions_allowed.js', 'orig.js')
+    shutil.copy('test_exceptions_allowed.js', 'orig.js')
 
     # check that an empty allow list works properly (as in, same as exceptions disabled)
 
@@ -1164,21 +1164,21 @@ def test_exceptions_allowed(self):
     empty_size = os.path.getsize('test_exceptions_allowed.js')
     if self.is_wasm():
       empty_size += os.path.getsize('test_exceptions_allowed.wasm')
-    shutil.copyfile('test_exceptions_allowed.js', 'empty.js')
+    shutil.copy('test_exceptions_allowed.js', 'empty.js')
 
     self.set_setting('EXCEPTION_CATCHING_ALLOWED', ['fake'])
     self.do_run_in_out_file_test('core/test_exceptions_allowed.cpp', out_suffix='_empty', assert_returncode=NON_ZERO)
     fake_size = os.path.getsize('test_exceptions_allowed.js')
     if self.is_wasm():
       fake_size += os.path.getsize('test_exceptions_allowed.wasm')
-    shutil.copyfile('test_exceptions_allowed.js', 'fake.js')
+    shutil.copy('test_exceptions_allowed.js', 'fake.js')
 
     self.clear_setting('EXCEPTION_CATCHING_ALLOWED')
     self.do_run_in_out_file_test('core/test_exceptions_allowed.cpp', out_suffix='_empty', assert_returncode=NON_ZERO)
     disabled_size = os.path.getsize('test_exceptions_allowed.js')
     if self.is_wasm():
       disabled_size += os.path.getsize('test_exceptions_allowed.wasm')
-    shutil.copyfile('test_exceptions_allowed.js', 'disabled.js')
+    shutil.copy('test_exceptions_allowed.js', 'disabled.js')
 
     print('size: %d' % size)
     print('empty_size: %d' % empty_size)
@@ -2595,7 +2595,7 @@ def test_pthread_tls_dylink(self):
     self.do_run_in_out_file_test('pthread/test_pthread_tls_dylink.c')
 
   def test_pthread_run_script(self):
-    shutil.copyfile(test_file('pthread/foo.js'), 'foo.js')
+    shutil.copy(test_file('pthread/foo.js'), '.')
     self.do_runf('pthread/test_pthread_run_script.c')
 
     # Run the test again with PROXY_TO_PTHREAD
@@ -3234,7 +3234,7 @@ def test_dlfcn_alignment_and_zeroing(self):
     self.build_dlfcn_lib('liblib.c')
     for i in range(10):
       curr = '%d.so' % i
-      shutil.copyfile('liblib.so', curr)
+      shutil.copy('liblib.so', curr)
 
     self.prep_dlfcn_main()
     self.set_setting('INITIAL_MEMORY', '128mb')
@@ -6701,7 +6701,7 @@ def test_freetype(self):
     ))
 
     # Not needed for js, but useful for debugging
-    shutil.copyfile(test_file('freetype/LiberationSansBold.ttf'), 'font.ttf')
+    shutil.copy(test_file('freetype/LiberationSansBold.ttf'), 'font.ttf')
     ftlib = self.get_freetype_library()
 
     # Main
@@ -6809,7 +6809,7 @@ def test_poppler(self):
     # See https://github.com/emscripten-core/emscripten/issues/20757
     self.emcc_args.append('-Wno-deprecated-declarations')
     poppler = self.get_poppler_library()
-    shutil.copyfile(test_file('poppler/paper.pdf'), 'paper.pdf')
+    shutil.copy(test_file('poppler/paper.pdf'), '.')
 
     create_file('pre.js', '''
     Module.preRun = () => {
@@ -7804,7 +7804,7 @@ def test_dwarf(self):
 
     js_filename = 'a.out.js'
     wasm_filename = 'a.out.wasm'
-    shutil.copyfile(test_file('core/test_dwarf.c'), 'test_dwarf.c')
+    shutil.copy(test_file('core/test_dwarf.c'), '.')
 
     self.emcc('test_dwarf.c', output_filename=js_filename)
 
@@ -8391,7 +8391,7 @@ def break_wasm(name):
           break
       if wat is None:
         # $foo_end is not present in the wasm, nothing to break
-        shutil.copyfile(name, name + '.orig')
+        shutil.copy(name, name + '.orig')
         return False
       create_file('wat.wat', wat)
       shutil.move(name, name + '.orig')
@@ -8416,8 +8416,8 @@ def verify_broken(args):
     verify_broken(['0'])
 
     # restore
-    shutil.copyfile('emscripten_lazy_load_code.wasm.orig', 'emscripten_lazy_load_code.wasm')
-    shutil.copyfile('emscripten_lazy_load_code.wasm.lazy.wasm.orig', 'emscripten_lazy_load_code.wasm.lazy.wasm')
+    shutil.copy('emscripten_lazy_load_code.wasm.orig', 'emscripten_lazy_load_code.wasm')
+    shutil.copy('emscripten_lazy_load_code.wasm.lazy.wasm.orig', 'emscripten_lazy_load_code.wasm.lazy.wasm')
     verify_working(['0'])
 
     if conditional:
@@ -9327,7 +9327,7 @@ def test_pthread_dlopen_many(self):
     self.emcc_args += ['-Wno-experimental', '-pthread']
     self.build_dlfcn_lib(test_file('core/pthread/test_pthread_dlopen_side.c'))
     for i in range(nthreads):
-      shutil.copyfile('liblib.so', f'liblib{i}.so')
+      shutil.copy('liblib.so', f'liblib{i}.so')
 
     self.prep_dlfcn_main()
     self.set_setting('EXIT_RUNTIME')
diff --git a/test/test_interactive.py b/test/test_interactive.py
index 5c53b37e2342..ea2467548543 100644
--- a/test/test_interactive.py
+++ b/test/test_interactive.py
@@ -55,10 +55,10 @@ def test_sdl2_togglefullscreen(self):
     self.btest_exit('browser/test_sdl_togglefullscreen.c', args=['-sUSE_SDL=2'])
 
   def test_sdl_audio(self):
-    shutil.copyfile(test_file('sounds/alarmvictory_1.ogg'), self.in_dir('sound.ogg'))
-    shutil.copyfile(test_file('sounds/alarmcreatemiltaryfoot_1.wav'), self.in_dir('sound2.wav'))
-    shutil.copyfile(test_file('sounds/noise.ogg'), self.in_dir('noise.ogg'))
-    shutil.copyfile(test_file('sounds/the_entertainer.ogg'), self.in_dir('the_entertainer.ogg'))
+    shutil.copy(test_file('sounds/alarmvictory_1.ogg'), 'sound.ogg')
+    shutil.copy(test_file('sounds/alarmcreatemiltaryfoot_1.wav'), 'sound2.wav')
+    shutil.copy(test_file('sounds/noise.ogg'), 'noise.ogg')
+    shutil.copy(test_file('sounds/the_entertainer.ogg'), 'the_entertainer.ogg')
     create_file('bad.ogg', 'I claim to be audio, but am lying')
 
     # use closure to check for a possible bug with closure minifying away newer Audio() attributes
@@ -70,7 +70,7 @@ def test_sdl_audio(self):
     #        depended on fragile SDL1/SDL2 mixing, which stopped working with
     #        7a5744d754e00bec4422405a1a94f60b8e53c8fc (which just uncovered
     #        the existing problem)
-    # self.run_process([EMCC, '-O1', '--closure', '0', '--minify=0', self.in_dir('sdl_audio.c'), '--preload-file', 'sound.ogg', '--preload-file', 'sound2.wav', '--embed-file', 'the_entertainer.ogg', '--preload-file', 'noise.ogg', '--preload-file', 'bad.ogg', '-o', 'page.html', '-sEXPORTED_FUNCTIONS=[_main,_play,_play2', '-sUSE_SDL=2', '-DUSE_SDL2']).communicate()
+    # self.run_process([EMCC, '-O1', '--closure', '0', '--minify=0', 'sdl_audio.c', '--preload-file', 'sound.ogg', '--preload-file', 'sound2.wav', '--embed-file', 'the_entertainer.ogg', '--preload-file', 'noise.ogg', '--preload-file', 'bad.ogg', '-o', 'page.html', '-sEXPORTED_FUNCTIONS=[_main,_play,_play2', '-sUSE_SDL=2', '-DUSE_SDL2']).communicate()
     # self.run_browser('page.html', '', '/report_result?1')
 
   @parameterized({
@@ -78,7 +78,7 @@ def test_sdl_audio(self):
     'wasmfs': (['-sWASMFS'],),
   })
   def test_sdl_audio_mix_channels(self, args):
-    shutil.copyfile(test_file('sounds/noise.ogg'), self.in_dir('sound.ogg'))
+    shutil.copy(test_file('sounds/noise.ogg'), 'sound.ogg')
 
     self.btest_exit('test_sdl_audio_mix_channels.c', args=['-O2', '--minify=0', '--preload-file', 'sound.ogg'] + args)
 
@@ -87,14 +87,14 @@ def test_sdl_audio_mix_channels(self, args):
     'wasmfs': (['-sWASMFS'],),
   })
   def test_sdl_audio_mix(self, args):
-    shutil.copyfile(test_file('sounds/pluck.ogg'), self.in_dir('sound.ogg'))
-    shutil.copyfile(test_file('sounds/the_entertainer.ogg'), self.in_dir('music.ogg'))
-    shutil.copyfile(test_file('sounds/noise.ogg'), self.in_dir('noise.ogg'))
+    shutil.copy(test_file('sounds/pluck.ogg'), 'sound.ogg')
+    shutil.copy(test_file('sounds/the_entertainer.ogg'), 'music.ogg')
+    shutil.copy(test_file('sounds/noise.ogg'), 'noise.ogg')
 
     self.btest_exit('test_sdl_audio_mix.c', args=['-O2', '--minify=0', '--preload-file', 'sound.ogg', '--preload-file', 'music.ogg', '--preload-file', 'noise.ogg'] + args)
 
   def test_sdl_audio_panning(self):
-    shutil.copyfile(test_file('sounds/the_entertainer.wav'), self.in_dir('the_entertainer.wav'))
+    shutil.copy(test_file('sounds/the_entertainer.wav'), '.')
 
     # use closure to check for a possible bug with closure minifying away newer Audio() attributes
     self.btest_exit('test_sdl_audio_panning.c', args=['-O2', '--closure=1', '--minify=0', '--preload-file', 'the_entertainer.wav', '-sEXPORTED_FUNCTIONS=_main,_play'])
@@ -104,7 +104,7 @@ def test_sdl_audio_beeps(self):
     self.btest_exit('test_sdl_audio_beep.cpp', args=['-O2', '--closure=1', '--minify=0', '-sDISABLE_EXCEPTION_CATCHING=0', '-o', 'page.html'])
 
   def test_sdl2_mixer_wav(self):
-    shutil.copyfile(test_file('sounds/the_entertainer.wav'), 'sound.wav')
+    shutil.copy(test_file('sounds/the_entertainer.wav'), 'sound.wav')
     self.btest_exit('browser/test_sdl2_mixer_wav.c', args=[
       '-O2',
       '-sUSE_SDL=2',
@@ -119,7 +119,7 @@ def test_sdl2_mixer_wav(self):
     'mp3': (['mp3'],    'MIX_INIT_MP3', 'pudinha.mp3'),
   })
   def test_sdl2_mixer_music(self, formats, flags, music_name):
-    shutil.copyfile(test_file('sounds', music_name), music_name)
+    shutil.copy(test_file('sounds', music_name), '.')
     self.btest('browser/test_sdl2_mixer_music.c', expected='exit:0', args=[
       '-O2',
       '--minify=0',
@@ -142,7 +142,7 @@ def test_sdl2_audio_beeps(self):
     'proxy_to_pthread': (['-sPROXY_TO_PTHREAD', '-pthread'],),
   })
   def test_openal_playback(self, args):
-    shutil.copyfile(test_file('sounds/audio.wav'), self.in_dir('audio.wav'))
+    shutil.copy(test_file('sounds/audio.wav'), '.')
     self.btest('openal/test_openal_playback.c', '1', args=['-O2', '--preload-file', 'audio.wav'] + args)
 
   def test_openal_buffers(self):
diff --git a/test/test_other.py b/test/test_other.py
index 5969606f258a..5a7d2d9ef841 100644
--- a/test/test_other.py
+++ b/test/test_other.py
@@ -1166,7 +1166,7 @@ def test_odd_suffixes(self):
     for suffix in ('CPP', 'c++', 'C++', 'cxx', 'CXX', 'cc', 'CC'):
       self.clear()
       print(suffix)
-      shutil.copyfile(test_file('hello_world.c'), 'test.' + suffix)
+      shutil.copy(test_file('hello_world.c'), 'test.' + suffix)
       self.do_runf('test.' + suffix, 'hello, world!')
 
     for suffix in ('lo'):
@@ -1743,10 +1743,8 @@ def test_ungetc_fscanf(self):
     self.assertContained('zyx', self.run_process(config.JS_ENGINES[0] + ['a.out.js'], stdout=PIPE, stderr=PIPE).stdout)
 
   def test_abspaths(self):
-    # Includes with absolute paths are generally dangerous, things like -I/usr/.. will get to system local headers, not our portable ones.
-
-    shutil.copyfile(test_file('hello_world.c'), 'main.c')
-
+    # Includes with absolute paths are generally dangerous, things like -I/usr/.. will get to system
+    # local headers, not our portable ones.
     for args, expected in [(['-I/usr/something', '-Wwarn-absolute-paths'], True),
                            (['-L/usr/something', '-Wwarn-absolute-paths'], True),
                            (['-I/usr/something'], False),
@@ -1757,7 +1755,7 @@ def test_abspaths(self):
                            (['-Lsubdir/something', '-Wwarn-absolute-paths'], False),
                            ([], False)]:
       print(args, expected)
-      proc = self.run_process([EMCC, 'main.c'] + args, stderr=PIPE)
+      proc = self.run_process([EMCC, test_file('hello_world.c')] + args, stderr=PIPE)
       WARNING = 'encountered. If this is to a local system header/library, it may cause problems (local system files make sense for compiling natively on your system, but not necessarily to JavaScript)'
       self.assertContainedIf(WARNING, proc.stderr, expected)
 
@@ -2118,7 +2116,7 @@ def test(link_flags, lib_suffix):
       self.assertContained('*hello from lib\n|hello from lib|\n*\n', self.run_js('a.out.js'))
 
     test(['-lfile'], '') # -l, auto detection from library path
-    test([self.in_dir('libdir', 'libfile.so.3.1.4.1.5.9')], '.3.1.4.1.5.9') # handle libX.so.1.2.3 as well
+    test([self.in_dir('libdir/libfile.so.3.1.4.1.5.9')], '.3.1.4.1.5.9') # handle libX.so.1.2.3 as well
 
   @node_pthreads
   def test_dylink_pthread_static_data(self):
@@ -2417,7 +2415,7 @@ def test_sdl2_gfx_linkable(self):
 
   @requires_network
   def test_libpng(self):
-    shutil.copyfile(test_file('third_party/libpng/pngtest.png'), 'pngtest.png')
+    shutil.copy(test_file('third_party/libpng/pngtest.png'), '.')
     self.do_runf('third_party/libpng/pngtest.c', 'libpng passes test',
                  emcc_args=['--embed-file', 'pngtest.png', '-sUSE_LIBPNG'])
     self.do_runf('third_party/libpng/pngtest.c', 'libpng passes test',
@@ -2426,7 +2424,7 @@ def test_libpng(self):
   @node_pthreads
   @requires_network
   def test_libpng_with_pthreads(self):
-    shutil.copyfile(test_file('third_party/libpng/pngtest.png'), 'pngtest.png')
+    shutil.copy(test_file('third_party/libpng/pngtest.png'), '.')
     self.do_runf('third_party/libpng/pngtest.c', 'libpng passes test',
                  emcc_args=['--embed-file', 'pngtest.png', '-sUSE_LIBPNG', '-pthread'])
 
@@ -2434,7 +2432,7 @@ def test_libpng_with_pthreads(self):
   def test_giflib(self):
     # giftext.c contains a sprintf warning
     self.emcc_args += ['-Wno-fortify-source']
-    shutil.copyfile(test_file('third_party/giflib/treescap.gif'), 'treescap.gif')
+    shutil.copy(test_file('third_party/giflib/treescap.gif'), '.')
     self.do_runf('third_party/giflib/giftext.c',
                  'GIF file terminated normally',
                  emcc_args=['--embed-file', 'treescap.gif', '-sUSE_GIFLIB'],
@@ -2451,7 +2449,7 @@ def test_giflib(self):
 
   @requires_network
   def test_libjpeg(self):
-    shutil.copyfile(test_file('screenshot.jpg'), 'screenshot.jpg')
+    shutil.copy(test_file('screenshot.jpg'), '.')
     self.do_runf('jpeg_test.c', 'Image is 600 by 450 with 3 components',
                  emcc_args=['--embed-file', 'screenshot.jpg', '-sUSE_LIBJPEG'],
                  args=['screenshot.jpg'])
@@ -2896,7 +2894,7 @@ def test_js_optimizer_py(self, name, passes):
     # run the js optimizer python script. this differs from test_js_optimizer
     # which runs the internal js optimizer JS script directly (which the python
     # script calls)
-    shutil.copyfile(test_file('js_optimizer', name + '.js'), name + '.js')
+    shutil.copy(test_file('js_optimizer', name + '.js'), '.')
     self.run_process([PYTHON, path_from_root('tools/js_optimizer.py'), name + '.js'] + passes)
     actual = read_file(name + '.js.jsopt.js')
     self.assertFileContents(test_file('js_optimizer', name + '-output.js'), actual)
@@ -3748,7 +3746,7 @@ def test_file_packager_modularize(self):
     self.assertContained('|hello world|', result)
 
   def test_sdl_headless(self):
-    shutil.copyfile(test_file('screenshot.png'), 'example.png')
+    shutil.copy(test_file('screenshot.png'), 'example.png')
     self.do_other_test('test_sdl_headless.c', emcc_args=['-sHEADLESS'])
 
   def test_preprocess(self):
@@ -3888,7 +3886,7 @@ def test_module_exports_with_closure(self):
 
     # Check that main.js (which requires test.js) completes successfully when run in node.js
     # in order to check that the exports are indeed functioning correctly.
-    shutil.copyfile(test_file('module_exports/main.js'), 'main.js')
+    shutil.copy(test_file('module_exports/main.js'), '.')
     self.assertContained('bufferTest finished', self.run_js('main.js'))
 
     # Delete test.js again and check it's gone.
@@ -4297,10 +4295,10 @@ def test_proxyfs(self):
                       '-sEXPORTED_RUNTIME_METHODS=ccall,cwrap,FS,PROXYFS',
                       '-lproxyfs.js',
                       '-sWASM_ASYNC_COMPILATION=0'])
-    # Following shutil.copyfile just prevent 'require' of node.js from caching js-object.
+    # Following shutil.copy just prevent 'require' of node.js from caching js-object.
     # See https://nodejs.org/api/modules.html
-    shutil.copyfile('proxyfs_test.js', 'proxyfs_test1.js')
-    shutil.copyfile('proxyfs_test.js', 'proxyfs_test2.js')
+    shutil.copy('proxyfs_test.js', 'proxyfs_test1.js')
+    shutil.copy('proxyfs_test.js', 'proxyfs_test2.js')
     out = self.run_js('proxyfs_test_main.js')
     section = "child m1 reads and writes local file."
     self.assertContained(section + ":m1 read embed:test", out)
@@ -4369,21 +4367,21 @@ def test_dependency_file(self):
     self.assertContained('test.h', tail)
 
   def test_dependency_file_2(self):
-    shutil.copyfile(test_file('hello_world.c'), 'a.c')
+    shutil.copy(test_file('hello_world.c'), 'a.c')
     self.run_process([EMCC, 'a.c', '-MMD', '-MF', 'test.d', '-c'])
     self.assertContained('a.o: a.c\n', read_file('test.d'))
 
-    shutil.copyfile(test_file('hello_world.c'), 'a.c')
+    shutil.copy(test_file('hello_world.c'), 'a.c')
     self.run_process([EMCC, 'a.c', '-MMD', '-MF', 'test2.d', '-c', '-o', 'test.o'])
     self.assertContained('test.o: a.c\n', read_file('test2.d'))
 
-    shutil.copyfile(test_file('hello_world.c'), 'a.c')
+    shutil.copy(test_file('hello_world.c'), 'a.c')
     ensure_dir('obj')
     self.run_process([EMCC, 'a.c', '-MMD', '-MF', 'test3.d', '-c', '-o', 'obj/test.o'])
     self.assertContained('obj/test.o: a.c\n', read_file('test3.d'))
 
   def test_compilation_database(self):
-    shutil.copyfile(test_file('hello_world.c'), 'a.c')
+    shutil.copy(test_file('hello_world.c'), 'a.c')
     self.run_process([EMCC, 'a.c', '-MJ', 'hello.json', '-c', '-o', 'test.o'])
     self.assertContained('"file": "a.c", "output": "test.o"', read_file('hello.json'))
 
@@ -6424,7 +6422,7 @@ def test_cleanup_os(self):
     def test(args, be_clean):
       print(args)
       self.clear()
-      shutil.copyfile(test_file('hello_world.c'), 'a.c')
+      shutil.copy(test_file('hello_world.c'), 'a.c')
       create_file('b.c', ' ')
       self.run_process([EMCC, 'a.c', 'b.c'] + args)
       clutter = glob.glob('*.o')
@@ -8115,8 +8113,8 @@ def test(p1, p2, p3, last, expected):
       create_file('src.cpp', src)
       self.run_process([EMXX, 'src.cpp', '-O2', '-sEVAL_CTORS', '-profiling-funcs'])
       self.assertContained('total is %s.' % hex(expected), self.run_js('a.out.js'))
-      shutil.copyfile('a.out.js', 'x' + hex(expected) + '.js')
-      shutil.copyfile('a.out.wasm', 'x' + hex(expected) + '.wasm')
+      shutil.copy('a.out.js', 'x' + hex(expected) + '.js')
+      shutil.copy('a.out.wasm', 'x' + hex(expected) + '.wasm')
       return os.path.getsize('a.out.wasm')
 
     print('no bad ctor')
@@ -9612,7 +9610,7 @@ def test_closure_webgpu(self):
   def test_closure_externs(self):
     # Test with relocate path to the externs file to ensure that incoming relative paths
     # are translated correctly (Since closure runs with a different CWD)
-    shutil.copyfile(test_file('test_closure_externs.js'), 'local_externs.js')
+    shutil.copy(test_file('test_closure_externs.js'), 'local_externs.js')
     test_cases = (
       ['--closure-args', '--externs "local_externs.js"'],
       ['--closure-args', '--externs=local_externs.js'],
@@ -9627,7 +9625,7 @@ def test_closure_externs(self):
   # Tests that it is possible to enable the Closure compiler via --closure=1 even if any of the input files reside in a path with unicode characters.
   def test_closure_cmdline_utf8_chars(self):
     test = "☃ äö Ć € ' 🦠.c"
-    shutil.copyfile(test_file('hello_world.c'), test)
+    shutil.copy(test_file('hello_world.c'), test)
     externs = '💩' + test
     create_file(externs, '')
     self.run_process([EMCC, test, '--closure=1', '--closure-args', '--externs "' + externs + '"'])
@@ -9955,7 +9953,7 @@ def test_check_sourcemapurl_default(self, *args):
 
   def test_wasm_sourcemap(self):
     # The no_main.c will be read (from relative location) due to speficied "-s"
-    shutil.copyfile(test_file('other/wasm_sourcemap/no_main.c'), 'no_main.c')
+    shutil.copy(test_file('other/wasm_sourcemap/no_main.c'), '.')
     wasm_map_cmd = [PYTHON, path_from_root('tools/wasm-sourcemap.py'),
                     '--sources', '--prefix', '=wasm-src://',
                     '--load-prefix', '/emscripten/test/other/wasm_sourcemap=.',
@@ -9993,7 +9991,7 @@ def test(infile, source_map_added_dir=''):
       if source_map_added_dir:
         expected_source_map_path = source_map_added_dir + '/' + expected_source_map_path
       print(infile, expected_source_map_path)
-      shutil.copyfile(test_file('hello_123.c'), infile)
+      shutil.copy(test_file('hello_123.c'), infile)
       infiles = [
         infile,
         os.path.abspath(infile),
@@ -14800,7 +14798,7 @@ def test_no_minify_and_later_closure(self):
     temp = building.closure_compiler('a.out.js',
                                      advanced=True,
                                      extra_closure_args=['--formatting', 'PRETTY_PRINT'])
-    shutil.copyfile(temp, 'closured.js')
+    shutil.copy(temp, 'closured.js')
     self.assertContained('hello, world!', self.run_js('closured.js'))
 
   def test_table_base(self):