	@Test
	public void testSimpleEnvironmentVariable() {


		String environmentVariableKey = "key";
		String environmentVariableValue = "value";
		
		new MockUp<System>() {
			@Mock
			Map<String,String> getenv() {
				Map<String, String> environmentVariables = new HashMap<>();
				environmentVariables.put(environmentVariableKey, environmentVariableValue);
				return environmentVariables;
			}
		};
		
		JsonNode configuration = environmentVariablesConfigurationSource.getConfiguration();
		
		String actualEnvironmentVariableValue = configuration.at(JsonPointerUtils.fromProperty(environmentVariableKey)).asText();
		assertThat(actualEnvironmentVariableValue, is(equalTo(environmentVariableValue)));
	}