[TEST] Audio Converter & audio processing tools

[jbaddley]

Routes

• /audio-converter
• /m4a-to-mp3, /mp3-to-wav, /ogg-to-mp3, /wav-to-mp3
• /change-audio-pitch
• /change-audio-speed
• /merge-audio
• /audio-fade
• /normalize-audio
• /online-voice-recorder

Scenarios to test

Audio Converter (core)

• Dropzone accepts .mp3, .wav, .ogg, .m4a, .flac
• Uploading an MP3 shows the file name and duration
• Output format selector shows MP3, WAV, OGG, M4A options
• Selecting MP3 output shows a bitrate selector
• Clicking "Convert" starts conversion (show loading/progress state)
• Download button appears when conversion completes
• Downloaded file has the correct extension

Format-specific routes

• /m4a-to-mp3 — uploads M4A, outputs MP3
• /mp3-to-wav — uploads MP3, outputs WAV
• /ogg-to-mp3 — uploads OGG, outputs MP3
• /wav-to-mp3 — uploads WAV, outputs MP3
• Each route shows the correct source → target label in the UI

Change Audio Pitch (/change-audio-pitch)

• Dropzone accepts audio files
• A pitch control (slider or semitone input) is present
• Adjusting pitch and converting produces a download
• Extreme pitch values (very high/low) do not crash the tool

Change Audio Speed (/change-audio-speed)

• Speed multiplier control is present (e.g. 0.5×, 1×, 2×)
• Adjusting speed and converting produces a download

Merge Audio (/merge-audio)

• Multiple audio files can be uploaded
• A list shows each uploaded file
• Reordering files (if supported) works
• "Merge" button combines them into a single download

Audio Fade (/audio-fade)

• Fade-in and fade-out duration inputs are present
• Applying fade produces a download with the fade applied

Normalize Audio (/normalize-audio)

• Dropzone accepts audio files
• Normalization runs and produces a download

Online Voice Recorder (/online-voice-recorder)

• Record button is present (may require microphone permission mock)
• UI shows a timer during recording
• Stop button appears while recording
• After stopping, a download button or audio playback is available

Acceptance criteria

• Audio converter completes MP3→WAV and WAV→MP3 conversions end-to-end
• All format-specific routes load without errors
• Merge produces a combined audio file download