void FromDelegate()
{
IEqualityComparer comp = null;
Test.If.Action.ThrowsException(() => comp = DynamicEqualityComparer.FromDelegate(null, null), out ArgumentNullException ex1);
Test.If.Value.IsEqual(ex1.ParamName, "equals");
Test.If.Action.ThrowsException(() => comp = DynamicEqualityComparer.FromDelegate(null, (obj) => 42), out ex1);
Test.If.Value.IsEqual(ex1.ParamName, "equals");
Test.If.Action.ThrowsException(() => comp = DynamicEqualityComparer.FromDelegate((x, y) => true, null), out ex1);
Test.If.Value.IsEqual(ex1.ParamName, "getHashCode");
Test.IfNot.Action.ThrowsException(() => comp = DynamicEqualityComparer.FromDelegate((x, y) => true, (obj) => 42), out Exception ex2);
}
void FromComparer()
{
IEqualityComparer <Dummy> comp = null;
Boolean result = false;
Int32 hash = 0;
Test.If.Action.ThrowsException(() => comp = DynamicEqualityComparer.FromComparer <Dummy>(null), out ArgumentNullException ex1);
Test.If.Value.IsEqual(ex1.ParamName, "comparer");
Test.IfNot.Action.ThrowsException(() => comp = DynamicEqualityComparer.FromComparer <Dummy>(DynamicEqualityComparer.FromDelegate((x, y) => true, (obj) => 42)), out Exception ex2);
result = comp.Equals(0, 1);
Test.If.Value.IsEqual(result, true);
hash = comp.GetHashCode(0);
Test.If.Value.IsEqual(hash, 42);
}
void ComparisonInvokes()
{
IEqualityComparer comp = null;
Boolean result = false;
Int32 hash = 0;
comp = DynamicEqualityComparer.FromDelegate((x, y) => throw new NotImplementedException(), (obj) => throw new NotImplementedException());
Test.If.Action.ThrowsException(() => result = comp.Equals(0, 1), out NotImplementedException ex1);
Test.If.Action.ThrowsException(() => hash = comp.GetHashCode(0), out ex1);
comp = DynamicEqualityComparer.FromDelegate((x, y) => true, (obj) => 42);
Test.IfNot.Action.ThrowsException(() => result = comp.Equals(0, 1), out Exception ex2);
Test.If.Value.IsEqual(result, true);
Test.IfNot.Action.ThrowsException(() => hash = comp.GetHashCode(0), out ex2);
Test.If.Value.IsEqual(hash, 42);
}
void FromIEquatable()
{
IEqualityComparer <EXDummyIEquatableT> comp = null;
Boolean result = false;
Test.IfNot.Action.ThrowsException(() => comp = DynamicEqualityComparer.FromIEquatable <EXDummyIEquatableT>(), out Exception ex);
Test.IfNot.Action.ThrowsException(() => result = comp.Equals(null, null), out ArithmeticException ex2);
Test.If.Value.IsTrue(result);
Test.IfNot.Action.ThrowsException(() => result = comp.Equals(null, 0), out ex2);
Test.If.Value.IsFalse(result);
Test.IfNot.Action.ThrowsException(() => result = comp.Equals(0, null), out ex2);
Test.If.Value.IsFalse(result);
Test.If.Action.ThrowsException(() => result = comp.Equals(0, 1), out ex2);
Test.If.Value.IsEqual(ex2.Message, "'1'");
}