Adds screenshot testing

tests/test_convert_chromium_screenshots.py

@@ -5,6 +5,7 @@
 from httpx import codes
 
 from gotenberg_client import GotenbergClient
+from tests.conftest import SAMPLE_DIR
 from tests.conftest import SAVE_DIR
 from tests.conftest import SAVE_OUTPUTS
 
@@ -123,3 +124,26 @@ def test_status_codes_empty(self, client: GotenbergClient):
         assert resp.headers["Content-Type"] == "image/png"
         if SAVE_OUTPUTS:
             (SAVE_DIR / "test_screenshot_optimize_quality.png").write_bytes(resp.content)
+
+
+class TestChromiumScreenshotsFromMarkdown:
+    def test_markdown_screenshot(self, client: GotenbergClient):
+        test_file = SAMPLE_DIR / "basic.html"
+        md_files = [SAMPLE_DIR / "markdown1.md", SAMPLE_DIR / "markdown2.md"]
+
+        with client.chromium.screenshot_markdown() as route:
+            resp = route.index(test_file).resources(md_files).run_with_retry()
+        assert resp.status_code == codes.OK
+        assert "Content-Type" in resp.headers
+        assert resp.headers["Content-Type"] == "image/png"
+
+
+class TestChromiumScreenshotsFromHtml:
+    def test_markdown_screenshot(self, client: GotenbergClient):
+        test_file = SAMPLE_DIR / "basic.html"
+
+        with client.chromium.screenshot_html() as route:
+            resp = route.index(test_file).run_with_retry()
+        assert resp.status_code == codes.OK
+        assert "Content-Type" in resp.headers
+        assert resp.headers["Content-Type"] == "image/png"