public void Transform_ThrowsArgumentException_IfThereIsNoFieldOrPropertyWithName()
{
// Creating the expression "instance.GetNonExistentField()"
Expression instance = Expression.Parameter(typeof(Fixture), "instance");
Expression input = Expression.Call(instance, FixtureGetNonExistentField);
// Validating that FieldGetAttribute fails on non-existent field
FieldGetAttribute attribute = new FieldGetAttribute("NonExistentField");
Assert.ThrowsException <ArgumentException>(() => attribute.Transform(input));
}
public void Transform_ReplacesMethodCallExpressionWithAddAssignExpression_ForFieldEvents()
{
// Creating the expression "instance.GetField()"
ParameterExpression instance = Expression.Parameter(typeof(Fixture), "instance");
Expression input = Expression.Call(instance, FixtureGetField);
// Validating that FieldGetAttribute creates expression reading Field
Expression output = new FieldGetAttribute("Field").Transform(input);
Func <Fixture, int> getField = Expression.Lambda <Func <Fixture, int> >(output, new[] { instance }).Compile();
Fixture fixture = new Fixture()
{
Field = 5
};
Assert.AreEqual(5, getField(fixture));
}