public void OneSetIsEmpty_SetMultiply()
{
var a = new[] { 1, 2, 3 };
var b = new string[0];
Assert.That(a.SetMultiply(b, (i, s) => s + i), Is.Empty);
}
public void TestSetMultiply()
{
var a = new[] { 1, 2, 3 };
var b = new[] { "a", "b" };
CollectionAssert.AreEquivalent(
a.SetMultiply(b, (i, s) => s + i),
new[] { "a1", "a2", "a3", "b1", "b2", "b3" });
}