public void should_add_and_return_variable() { // given const string environment = "YAY"; var variableContainer = new VariableContainer(environment, _reservedVariableProvider, _sharedVariablesProvider); var variable = new Variable("my variable", "some value", environment); // when variableContainer.Add(variable); // then var result = variableContainer.First(x => x == variable); Assert.That(result, Is.Not.Null); }