public void SampleTest() { var service = new WeatherService(_loggerMock.Object); service.DoSomething(); _loggerMock.Verify(l => l.Log( LogLevel.Debug, It.IsAny <EventId>(), It.IsAny <It.IsAnyType>(), It.IsAny <Exception>(), (Func <It.IsAnyType, Exception, string>)It.IsAny <object>()), Times.Exactly(1)); }