public async Task Should_Return_Calculated_Result_As_Response_For_Valid_Expression()
{
// Arrange
_calculatorService.Setup(x => x.ValidateInput(It.IsAny <InputModel>()))
.ReturnsAsync(true);
_calculatorService.Setup(x => x.CalculateExpression(It.IsAny <InputModel>()))
.ReturnsAsync(14);
//Act
var result = await _sut.CalculateExpression(new InputModel()) as OkObjectResult;
//Assert
_calculatorService.Verify(x => x.ValidateInput(It.IsAny <InputModel>()), Times.Once);
Assert.IsNotNull(result);
result.Value.Should().BeOfType <string>().Which.Should().Contain("14");
result.Should().BeOfType <OkObjectResult>().Which.StatusCode.Should().Be(200);
}
