feat: initial commit

test/testutil/fake_file_downloader.go

@@ -0,0 +1,25 @@
+package testutil
+
+import "context"
+
+type FakeFileDownloader struct {
+	Data     []byte
+	MimeType string
+	Error    error
+}
+
+func (f *FakeFileDownloader) Download(_ context.Context, _ string) ([]byte, string, error) {
+	return f.Data, f.MimeType, f.Error
+}
+
+type FakeAudioConverter struct {
+	Output []byte
+	Error  error
+}
+
+func (f *FakeAudioConverter) Convert(_ context.Context, _ []byte, _, _ string) ([]byte, error) {
+	if f.Output != nil {
+		return f.Output, f.Error
+	}
+	return []byte("converted-audio"), f.Error
+}