public void IsOverlappingは２つの領域が重なっているかどうかを調べる(double x1, double x2, double y1, double y2, bool expected)
{
var value1 = new Region(x1, x2);
var value2 = new Region(y1, y2);
Assert.AreEqual(expected, value1.IsOverlapping(value2));
Assert.AreEqual(expected, value2.IsOverlapping(value1));
}