public void CoerceDelegate_WhenSourceDelegateIsAssignableToTargetDelegateType_ReturnsSameDelegate()
{
VoidDelegate1 sourceDelegate = () => { };
var targetDelegate = (VoidDelegate1)ProxyUtils.CoerceDelegate(typeof(VoidDelegate1), sourceDelegate);
Assert.AreSame(sourceDelegate, targetDelegate);
}
public void CoerceDelegate_Void_To_Void()
{
bool called = false;
VoidDelegate1 d1 = () => { called = true; };
var d2 = (VoidDelegate2)ProxyUtils.CoerceDelegate(typeof(VoidDelegate2), d1);
d2();
Assert.IsTrue(called);
}
public void CoerceDelegate_IntInt_To_IntInt()
{
bool called = false;
IntIntDelegate1 d1 = x => { called = true; return(x * x); };
var d2 = (IntIntDelegate2)ProxyUtils.CoerceDelegate(typeof(IntIntDelegate2), d1);
int result = d2(4);
Assert.IsTrue(called);
Assert.AreEqual(16, result);
}
public void CoerceDelegate_ObjectRefObject_To_ObjectRefObject()
{
bool called = false;
ObjectRefObjectDelegate1 d1 = (ref object x) => { called = true; int y = (int)x; x = y + 1; return(y * y); };
var d2 = (ObjectRefObjectDelegate2)ProxyUtils.CoerceDelegate(typeof(ObjectRefObjectDelegate2), d1);
object arg = 4;
object result = d2(ref arg);
Assert.IsTrue(called);
Assert.AreEqual(16, result);
Assert.AreEqual(5, arg);
}
public void CoerceDelegate_IntRefInt_To_ObjectRefObject()
{
bool called = false;
IntRefIntDelegate1 d1 = (ref int x) => { called = true; return(x * x++); };
var d2 = (ObjectRefObjectDelegate1)ProxyUtils.CoerceDelegate(typeof(ObjectRefObjectDelegate1), d1);
object arg = 4;
object result = d2(ref arg);
Assert.IsTrue(called);
Assert.AreEqual(16, result);
Assert.AreEqual(5, arg);
}
public void CoerceDelegate_WhenDelegateTypesIncompatible_Throws()
{
Assert.Multiple(() =>
{
Assert.Throws <InvalidOperationException>(() => ProxyUtils.CoerceDelegate(
typeof(VoidDelegate1), new IntDelegate1(() => 42)));
Assert.Throws <InvalidOperationException>(() => ProxyUtils.CoerceDelegate(
typeof(IntDelegate1), new IntIntDelegate1(x => 42)));
Assert.Throws <InvalidOperationException>(() => ProxyUtils.CoerceDelegate(
typeof(IntIntDelegate1), new IntOutIntDelegate1((out int x) => { x = 42; return(42); })));
Assert.Throws <InvalidOperationException>(() => ProxyUtils.CoerceDelegate(
typeof(IntIntDelegate1), new IntRefIntDelegate1((ref int x) => { x = 42; return(42); })));
Assert.Throws <InvalidOperationException>(() => ProxyUtils.CoerceDelegate(
typeof(IntOutIntDelegate1), new IntRefIntDelegate1((ref int x) => { x = 42; return(42); })));
});
}
public void CoerceDelegate_EventHandler_To_EventHandler()
{
bool called = false;
object actualSender = null;
EventArgs actualEventArgs = null;
EventHandlerDelegate1 d1 = (sender, e) => { called = true; actualSender = sender; actualEventArgs = e; };
var d2 = (EventHandlerDelegate2)ProxyUtils.CoerceDelegate(typeof(EventHandlerDelegate2), d1);
object expectedSender = this;
EventArgs expectedEventArgs = EventArgs.Empty;
d2(expectedSender, expectedEventArgs);
Assert.IsTrue(called);
Assert.AreSame(expectedSender, actualSender);
Assert.AreSame(expectedEventArgs, actualEventArgs);
}
public void CoerceDelegate_WhenSourceDelegateIsNull_ReturnsNull()
{
Assert.IsNull(ProxyUtils.CoerceDelegate(typeof(VoidDelegate1), null));
}
public void CoerceDelegate_WhenTargetDelegateTypeIsNotAValidDelegateType_Throws()
{
Assert.Throws <ArgumentException>(() => ProxyUtils.CoerceDelegate(typeof(object), new VoidDelegate1(() => { })));
}
public void CoerceDelegate_WhenTargetDelegateTypeIsNull_Throws()
{
Assert.Throws <ArgumentNullException>(() => ProxyUtils.CoerceDelegate(null, new VoidDelegate1(() => { })));
}