public void NegativeDiapason() {
Assert.AreEqual(201, "-100-100".ToDiapason(-1000, 1000).Count());
Assert.AreEqual(0, "-100-100".ToDiapason(-1000, 1000).Sum());
Assert.AreEqual(1, "-100 - -100".ToDiapason(-1000, 1000).Count());
Assert.AreEqual(1, "0 --0".ToDiapason(-1000, 1000).Count());
Assert.AreEqual(11, "--10".ToDiapason(-20, 1000).Count());
Assert.AreEqual(11, "-10-".ToDiapason(-20, 0).Count());
Assert.IsTrue("-10--5".DiapasonContains(-7));
}