public void IsTriangle_PositiveSides_ReturnsFalse(int a, int b, int c)
 {
     Assert.IsFalse(IsthisTriangle.IsTriangle(a, b, c));
 }
 public void IsTriangle_ValidPostiveNumbers_ReturnsTrue()
 {
     Assert.IsTrue(IsthisTriangle.IsTriangle(5, 7, 10));
 }
 public void IsTriangle_SumOfSidesEqualOtherSide_ReturnsFalse(int a, int b, int c)
 {
     Assert.IsFalse(IsthisTriangle.IsTriangle(a, b, c));
 }