public static void EachIsDistinct <T>(this IAssertionTool assertTool, Expression <Func <IEnumerable <T> > > collectionExp, string msg, params object[] fmt)
{
var set = new HashSet <T>();
Func <IAssertionTool, T, bool> isDistinct = (assert, t) => {
if (set.Contains(t))
{
return(false);
}
set.Add(t);
return(true);
};
assertTool.Each(collectionExp, (assert, t) => assert.IsTrue(() => isDistinct(assert, t)), msg, fmt);
}