String getProviderName() {
    return configuration.get(PROVIDER_NAME).orElseThrow(() -> new IllegalArgumentException("Provider Name is missing"));
  }
@Test
  public void return_provider_name() {
    settings.setProperty("sonar.auth.saml.providerName", "MyProviderName");

    assertThat(underTest.getProviderName()).isEqualTo("MyProviderName");
  }