diff --git a/spec/lib/zipline/zip_generator_spec.rb b/spec/lib/zipline/zip_generator_spec.rb
index 5213cbf..442d243 100644
--- a/spec/lib/zipline/zip_generator_spec.rb
+++ b/spec/lib/zipline/zip_generator_spec.rb
@@ -185,91 +185,4 @@ def create_filename
       end
     end
   end
-
-  describe '.write_file' do
-    let(:file) { StringIO.new('passthrough') }
-
-    context 'when passing an ActiveStorage::Filename object as filename' do
-      let(:filename) { ActiveStorage::Filename.new('test') }
-
-      let(:generator) do
-        Zipline::ZipGenerator.new([[file, filename]])
-      end
-
-      it 'passes a string as filename to ZipTricks' do
-        allow(file).to receive(:url).and_return('fakeurl')
-        expect_any_instance_of(ZipTricks::Streamer).to receive(:write_deflated_file)
-          .with('test')
-        generator.each { |_| 'Test' }
-      end
-    end
-  end
-
-  describe 'passing an options hash' do
-    let(:file) { StringIO.new('passthrough') }
-
-    context 'with optional arguments' do
-      let(:mtime) { 1.day.ago }
-      let(:generator) do
-        Zipline::ZipGenerator.new([[file, 'test', modification_time: mtime]])
-      end
-
-      it 'passes the options hash through handle_file' do
-        expect(generator).to receive(:handle_file)
-          .with(anything, anything, anything, { modification_time: mtime })
-        generator.each { |_| 'Test' }
-      end
-
-      it 'passes the options hash to ZipTricks as kwargs' do
-        allow(file).to receive(:url).and_return('fakeurl')
-        expect_any_instance_of(ZipTricks::Streamer).to receive(:write_deflated_file)
-          .with(anything, modification_time: mtime)
-        generator.each { |_| 'Test' }
-      end
-    end
-
-    context 'without optional arguments' do
-      let(:generator) do
-        Zipline::ZipGenerator.new([[file, 'test']])
-      end
-
-      it 'passes the options hash through handle_file' do
-        expect(generator).to receive(:handle_file)
-          .with(anything, anything, anything, {})
-        generator.each { |_| 'Test' }
-      end
-
-      it 'passes the options hash to ZipTricks as kwargs' do
-        allow(file).to receive(:url).and_return('fakeurl')
-        expect_any_instance_of(ZipTricks::Streamer).to receive(:write_deflated_file)
-          .with(anything)
-        generator.each { |_| 'Test' }
-      end
-    end
-
-    context 'with extra invalid options' do
-      let(:mtime) { 1.day.ago }
-      let(:generator) do
-        Zipline::ZipGenerator.new([[file, 'test', modification_time: mtime, extra: 'invalid']])
-      end
-
-      it 'passes the whole options hash through handle_file' do
-        expect(generator).to receive(:handle_file)
-          .with(anything, anything, anything, { modification_time: mtime, extra: 'invalid' })
-        generator.each { |_| 'Test' }
-      end
-
-      it 'only passes the kwargs to ZipTricks that it expects (i.e., :modification_time)' do
-        allow(file).to receive(:url).and_return('fakeurl')
-        expect_any_instance_of(ZipTricks::Streamer).to receive(:write_deflated_file)
-          .with(anything, modification_time: mtime)
-        generator.each { |_| 'Test' }
-      end
-    end
-  end
-  it 'passes along constructor options to ZipTricks streamer' do
-    expect(ZipTricks::Streamer).to receive(:open).with(anything, { :some => 'options' })
-    generator = Zipline::ZipGenerator.new([file, 'somefile'], :some => 'options')
-    generator.each { |_| 'Test' }
-  end
 end