Reflection Assert / Lenient Assertions

Originally reported on Google Code with ID 287

Describe the new feature you have in mind.

Provide a good syntax that works like Unitils ReflectionAssert.assertReflectionEquals

e.g. 

expect:
x refeq y
x === y
y ~~ y

Which particular problem would this feature solve for you?

Would make Spock even more convenient :) Objects often have equality implementations,
but tests often want to check for "full" equality (all properties are equal)

Please provide any additional information below. You can also assign
labels.

When adding this feature it would be cool if lenient assertions could be added too.
Here is an example: 

["a", "b"] equalsIgnoringOrder ["b", "a"]
[x, y] reflectionEqualsIgnoringOrder [y, x]

AND this would be a very helpful lenient assertion too: 

a ~ [ id: 1, name: "x" ]
where the assertion succeeds if a has the properties id, name with the given values.

Reported by peter.rietzler@smarter-ecommerce.com on 2012-12-10 14:02:20

The issue names no files, tests, or entry points. Start by reviewing Spock's existing assertion APIs and the referenced Unitils ReflectionAssert behavior. Done requires a decided syntax and semantics for reflection equality, order-insensitive comparisons, and lenient property matching, with corresponding tests.