public void TestSelectWhenDoesntExists()
{
string[] strings =
{ "Ana",
"Andrei",
"Sabin",
"Alin",
"Mihai" };
Func <string, bool> myFunc = (x) => x.StartsWith("gf", StringComparison.InvariantCultureIgnoreCase) ? true : false;
var results = LinqFunctions.Select(strings, p => myFunc(p));
var matches = 0;
foreach (var result in results)
{
if (result)
{
matches++;
}
}
Assert.Equal(0, matches);
}
public void TestSelectWhenNullSource()
{
string[] strings = null;
Func <string, int> myFunc = x => x.Length;
var p = myFunc;
var results = LinqFunctions.Select(strings, p);
var numerator = results.GetEnumerator();
var msg = Assert.Throws <ArgumentNullException>(() => numerator.MoveNext());
Assert.Equal("source", msg.ParamName);
}
public void TestSelectWhenNullSelector()
{
string[] strings =
{ "Ana",
"Andrei",
"Sabin",
"Alin",
"Mihai" };
Func <string, int> myFunc = null;
var p = myFunc;
var results = LinqFunctions.Select(strings, p);
var numerator = results.GetEnumerator();
var msg = Assert.Throws <ArgumentNullException>(() => numerator.MoveNext());
Assert.Equal("selector", msg.ParamName);
}