public void MemoizeLast()
{
var calls = 0;
var f = Memoization.MemoizeLast(delegate(int i) { calls++; return(i * 2); });
Assert.Equal(4, f(2));
Assert.Equal(1, calls);
Assert.Equal(4, f(2));
Assert.Equal(1, calls);
Assert.Equal(8, f(4));
Assert.Equal(2, calls);
}
public void MemoizeLastWithCustomComparer()
{
var calls = 0;
var comparer = StringComparer.OrdinalIgnoreCase;
var f = Memoization.MemoizeLast(delegate(string s) { calls++; return(s.ToUpperInvariant()); }, comparer);
Assert.Equal("FOOBAR", f("foobar"));
Assert.Equal(1, calls);
Assert.Equal("FOOBAR", f("FOOBAR"));
Assert.Equal(1, calls);
Assert.Equal("FOOBAR", f("FoObAr"));
Assert.Equal(1, calls);
}
public void MemoizeLastWithNullInputComparer()
{
var f = Memoization.MemoizeLast <object, object>(_ => null, null);
Assert.Null(f(new object()));
}
public void MemoizeLastThrowsWithNullFunction()
{
var e = Assert.Throws <ArgumentNullException>(() => Memoization.MemoizeLast <object, object>(null));
Assert.Equal("function", e.ParamName);
}