Microphone injection (iOS) - QA Wolf Docs

Use device.injectAudio() to replace your app’s microphone input with a pre-recorded audio file. This lets you test voice recording, speech recognition, and audio processing features under controlled, repeatable conditions. See the iOS Device Controls for the full API.

Audio injection is only available for apps that QA Wolf resigns during installation. It is not available for system apps or Safari.

Examples

Inject audio into the microphone

const cleanup = await device.injectAudio(driver, process.env.BUNDLE_ID, {
  data: `${process.env.TEAM_STORAGE_DIR}/sample_audio_input.wav`,
});

// trigger the microphone feature in your app

await cleanup();

Pull the recording off the device

const recordingAsBase64 = await driver.execute("mobile: pullFile", {
  remotePath: `@${process.env.BUNDLE_ID}:/path/to/recording.m4a`,
});

const buffer = Buffer.from(recordingAsBase64, "base64");
const { writeFile } = await import("node:fs/promises");
await writeFile(`${process.env.TEAM_STORAGE_DIR}/recording.m4a`, buffer);

When to use

Your app records audio or processes microphone input and you need to test that flow with known audio data.
Your app has voice commands or speech recognition features that need consistent, repeatable input.
Your app validates or transforms microphone input and you need to assert on the output.
Your test needs to simulate a specific audio input that is difficult to produce in a test environment.

Supported file types

WAV

Full sample test

import { device, flow } from "@qawolf/flows/ios";

const audioPath = `${process.env.TEAM_STORAGE_DIR}/sample_audio_input.wav`;

export default flow(
  "Test microphone input",
  {
    target: "iOS - iPhone 15 (iOS 26)",
    launch: {
      app: { env: "IPA_BUILD_LOCATION" },
      respectSystemAlerts: true,
      autoAcceptAlerts: true,
    },
  },
  async ({ driver, test }) => {
    await test("inject audio and verify recording was saved", async () => {
      // Arrange
      await driver.$(`//XCUIElementTypeButton[@name='Record Audio']`).click();

      // Act
      const cleanup = await device.injectAudio(driver, process.env.BUNDLE_ID, {
        data: audioPath,
      });

      await driver.$(`//XCUIElementTypeButton[@name='Record']`).click();
      await driver.pause(10_000);
      await driver.$(`//XCUIElementTypeButton[@name='Done']`).click();

      await cleanup();

      // Assert
      const recordingAsBase64 = await driver.execute("mobile: pullFile", {
        remotePath: `@${process.env.BUNDLE_ID}:/path/to/recording.m4a`,
      });

      const buffer = Buffer.from(recordingAsBase64, "base64");
      const { writeFile } = await import("node:fs/promises");
      await writeFile(`${process.env.TEAM_STORAGE_DIR}/recording.m4a`, buffer);

      expect(buffer.length).toBeGreaterThan(0);
    });
  },
);

Last modified on September 16, 2026