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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/
import AVFoundation
import Testing
@testable import QuickAnswersKit
@Suite
struct AudioManagerTests {
let session = MockAudioSession()
let engine = MockAudioEngine()
// MARK: - Audio Session Configuration Tests
@Test
func test_configureAudioSession_setsCorrectFields() throws {
let subject = createSubject()
try subject.configureAudioSession()
#expect(session.setCategoryCalls.count == 1)
#expect(session.setCategoryCalls[0].category == .record)
#expect(session.setCategoryCalls[0].mode == .measurement)
#expect(session.setCategoryCalls[0].options.contains(.duckOthers))
}
@Test
func test_configureAudioSession_activatesSessionWithCorrectOptions() throws {
let subject = createSubject()
try subject.configureAudioSession()
#expect(session.setActiveCalls.count == 1)
#expect(session.setActiveCalls[0].active == true)
#expect(session.setActiveCalls[0].options.contains(.notifyOthersOnDeactivation))
}
// MARK: - Engine Lifecycle Tests
@Test
func test_prepareAndStartEngine_callsExpectedEngineMethods() throws {
let subject = createSubject()
try subject.prepareAndStartEngine()
#expect(engine.prepareCallCount == 1)
#expect(engine.startCallCount == 1)
}
@Test
func test_stopEngine_callsStop() {
let subject = createSubject()
subject.stopEngine()
#expect(engine.stopCallCount == 1)
#expect(engine.mockInputNode.removeTapCallCount == 1)
}
// MARK: - Start Capture Tests
@Test
func test_startCapture_installsTapOnBus0() throws {
let subject = createSubject()
try subject.startCapture { _, _ in }
#expect(engine.mockInputNode.removeTapCallCount == 1)
#expect(engine.mockInputNode.installTapCallCount == 1)
}
@Test
func test_startCapture_usesCorrectBufferSize() throws {
let subject = createSubject()
try subject.startCapture(bufferSize: 1024) { _, _ in }
#expect(engine.mockInputNode.installTapCallCount == 1)
}
@Test
func test_startCapture_withFormatConversion_installsTap() throws {
let subject = createSubject()
let targetFormat = AVAudioFormat(
standardFormatWithSampleRate: 16000,
channels: 1
)!
try subject.startCapture(targetFormat: targetFormat) { _ in }
#expect(engine.mockInputNode.installTapCallCount == 1)
}
// MARK: - Format Conversion Tests
@Test
func test_convertIfNeeded_withDifferentSampleRate_convertsBuffer() throws {
let subject = createSubject()
let targetFormat = AVAudioFormat(standardFormatWithSampleRate: 16000, channels: 1)!
try subject.startCapture(targetFormat: targetFormat) { buffer in
#expect(buffer.format.sampleRate == 16000)
#expect(buffer.format.channelCount == 1)
// calculated by ratio (target sample rate / buffer sample rate) * buffer.frameLength
// (16000 / 44100) * 1024
#expect(buffer.frameLength == 371)
}
engine.mockInputNode.simulateAudioInput(frameCount: 1024)
#expect(engine.mockInputNode.outputFormatCallCount == 1)
#expect(engine.mockInputNode.removeTapCallCount == 1)
#expect(engine.mockInputNode.installTapCallCount == 1)
}
@Test
func test_convertIfNeeded_withMatchingSampleRate_passesThroughWithoutConversion() throws {
let subject = createSubject()
let targetFormat = AVAudioFormat(standardFormatWithSampleRate: 44100, channels: 1)!
try subject.startCapture(targetFormat: targetFormat) { buffer in
#expect(buffer.format.sampleRate == 44100.0)
#expect(buffer.format.channelCount == 1)
#expect(buffer.frameLength == 1024)
}
engine.mockInputNode.simulateAudioInput(frameCount: 1024)
#expect(engine.mockInputNode.outputFormatCallCount == 1)
#expect(engine.mockInputNode.removeTapCallCount == 1)
#expect(engine.mockInputNode.installTapCallCount == 1)
}
private func createSubject() -> AudioManager {
return AudioManager(audioEngine: engine, audioSession: session)
}
}