String getSubstitutionVariable(String key) {
    return substitutionVariables.get(key);
  }
@Test
  public void testMavenFormat() {
    assertThat(new LoggingConfiguration(new EnvironmentInformation("maven", "1.0"))
      .getSubstitutionVariable(LoggingConfiguration.PROPERTY_FORMAT)).isEqualTo(LoggingConfiguration.FORMAT_MAVEN);
  }