public void CalculateSalaryByInflationRateAndYear_WhenValidYear__WhenSalary3000andRate0_3_Return3900AndLogMetotRun() { double expected = 3900; _mockRate.Setup(x => x.GetInflationRateByYear(It.IsAny <int>())).Returns(0.3); var actual = _salaryService.CalculateSalaryByInflationRateAndYear(2020, 3000); Assert.Equal <double>(expected, actual); _mockLog.Verify(x => x.LogWrite(It.IsAny <string>()), Times.Once()); }