public void WhenLineProvided_MessageLogged() { // Arrange var line = "some message"; // Act _sut.LogLine(line); // Assert _buildEngine.DidNotReceive().LogErrorEvent(Arg.Any <BuildErrorEventArgs>()); _buildEngine.DidNotReceive().LogWarningEvent(Arg.Any <BuildWarningEventArgs>()); _buildEngine.Received(1).LogMessageEvent(Arg.Any <BuildMessageEventArgs>()); }