public void GetHashCode_gets_hash_code_from_every_rule(IEqualityRule <string> rule1,
IEqualityRule <string> rule2,
string str)
{
var sut = new MultipleEqualityRuleRunner <string>(new [] { rule1, rule2 });
sut.GetHashCode(str);
Mock.Get(rule1).Verify(x => x.GetHashCode(str), Times.Once);
Mock.Get(rule2).Verify(x => x.GetHashCode(str), Times.Once);
}