shell/platform/android/test/io/flutter/util/FakeKeyEvent.java

package io.flutter.util;

import android.view.KeyEvent;

// In the test environment, keyEvent.getUnicodeChar throws an exception. This
// class works around the exception by hardcoding the returned value.
public class FakeKeyEvent extends KeyEvent {
  public FakeKeyEvent(int action, int keyCode) {
    super(action, keyCode);
  }

  public final int getUnicodeChar() {
    if (getKeyCode() == KeyEvent.KEYCODE_BACK) {
      return 0;
    }
    return 1;
  }
}