public static void Abs()
{
Assert.Equal(MathF.PI, MathF.Abs(MathF.PI));
Assert.Equal(0.0f, MathF.Abs(0.0f));
Assert.Equal(MathF.PI, MathF.Abs(-MathF.PI));
Assert.Equal(float.NaN, MathF.Abs(float.NaN));
Assert.Equal(float.PositiveInfinity, MathF.Abs(float.PositiveInfinity));
Assert.Equal(float.PositiveInfinity, MathF.Abs(float.NegativeInfinity));
}