public void Test_GetHashValue()
{
var mat1 = new MyMaterial (1, 2.0f, "String");
var mat2 = new MyMaterial (1, 2.0f, "String");
var hash1 = mat1.GetHashValue ();
var hash2 = mat2.GetHashValue ();
Assert.AreEqual (hash1, hash2);
mat1.Value1 = 0;
mat2.Value1 = -1;
hash1 = mat1.GetHashValue ();
hash2 = mat2.GetHashValue ();
Assert.AreNotEqual (hash1, hash2);
}