@Override
  public boolean isDetected() {
    return "true".equalsIgnoreCase(system.envVariable("GITLAB_CI"));
  }
@Test
  public void isDetected() {
    setEnvVariable("GITLAB_CI", "true");
    assertThat(underTest.isDetected()).isTrue();

    setEnvVariable("GITLAB_CI", null);
    assertThat(underTest.isDetected()).isFalse();
  }