public void CalculateArea_ReturnsExpectedValue(double radius, double expected)
{
// Arrange
CircleByRadius sut = new CircleByRadius(radius);
// Act
double actual = sut.CalculateArea();
// Assert
Tolerance.AreEqual(actual, expected).Should().BeTrue();
}
public void Ctor_SetsRadius()
{
// Arrange
double radius = .1;
// Act
CircleByRadius sut = new CircleByRadius(radius);
// Assert
sut.Radius.Should().Be(radius);
}