| 1 | import AVFoundation |
| 2 | import CallsKit |
| 3 | import XCTest |
| 4 | |
| 5 | /// The Bluetooth rule, which only exists on iOS and so can only be tested |
| 6 | /// here — CallsKitTests builds for macOS, where AVAudioSession does not |
| 7 | /// exist at all. |
| 8 | final class AudioRouteTests: XCTestCase { |
| 9 | func testBluetoothIsAllowedOnlyWhenItIsTheChosenMicrophone() { |
| 10 | // .allowBluetoothHFP is what lets a Bluetooth microphone be used, and |
| 11 | // it is also what drags the whole call to the 8 kHz hands-free |
| 12 | // profile the moment any headset connects. Left on unconditionally — |
| 13 | // as it was until this change — every pair of AirPods silently cost |
| 14 | // the call its audio quality in both directions, and nothing said so. |
| 15 | let ordinary = AudioRoutes.options(bluetoothInput: false) |
| 16 | XCTAssertFalse( |
| 17 | ordinary.contains(.allowBluetoothHFP), |
| 18 | "a call with no Bluetooth microphone chosen must not offer the hands-free profile") |
| 19 | XCTAssertTrue( |
| 20 | ordinary.contains(.allowBluetoothA2DP), |
| 21 | "output should still reach a headset, at A2DP quality") |
| 22 | XCTAssertTrue(ordinary.contains(.defaultToSpeaker)) |
| 23 | |
| 24 | // Picking the headset microphone is an informed trade, and then HFP |
| 25 | // is exactly what has to be allowed for it to work at all. |
| 26 | let headset = AudioRoutes.options(bluetoothInput: true) |
| 27 | XCTAssertTrue(headset.contains(.allowBluetoothHFP)) |
| 28 | XCTAssertTrue(headset.contains(.defaultToSpeaker)) |
| 29 | } |
| 30 | |
| 31 | func testOnlyTheHandsFreePortCountsAsABluetoothMicrophone() { |
| 32 | // A2DP is output-only, so a Bluetooth device being used as a |
| 33 | // microphone is always on the hands-free port. Treating A2DP as a |
| 34 | // microphone would turn HFP back on for a headset nobody is |
| 35 | // recording from, which is the bug this rule exists to avoid. |
| 36 | XCTAssertEqual(AVAudioSession.Port.bluetoothHFP.rawValue, "BluetoothHFP") |
| 37 | XCTAssertNotEqual(AVAudioSession.Port.bluetoothA2DP, AVAudioSession.Port.bluetoothHFP) |
| 38 | } |
| 39 | } |
| 40 | |
amadan