public void CalculateThrowsWithInvalidGrade(int numberGrade)
{
// Arrange
var sut = new GradeCalculator();
// Act / Assert
Assert.Throws <ArgumentOutOfRangeException>(() => sut.Calculate(numberGrade));
}
public void CalculateReturnsApproprateGrade(int numberGrade, LetterGrade letterGrade)
{
// Arrange
var sut = new GradeCalculator();
// Act
var result = sut.Calculate(numberGrade);
// Assert
Assert.Equal(letterGrade, result);
}