public void Returns_Correct_Result(long n, long r, long expected)
{
// Arrange
// Act
var result = MathsF.Combinations(n, r);
// Assert
Assert.Equal(expected, result);
}
public void N_Less_Than_Zero_Returns_Minus_One()
{
// Arrange
// Act
var result = MathsF.Combinations(-1, Rnd.Lng);
// Assert
Assert.Equal(-1, result);
}
public void N_Less_Than_R_Returns_Minus_One()
{
// Arrange
var n = Rnd.NumberF.GetInt64(min: 2, max: 10);
var r = n + 1;
// Act
var result = MathsF.Combinations(n, r);
// Assert
Assert.Equal(-1, result);
}