Support ignoring collection order in Recursive comparison API

[zeljko-mirovic]

It will be nice to be able to ignore collection order with Recursive comparison API.
Instead of writing something like:

assertThat(actual).usingRecursiveComparison()
                  .ignoringFields("unorderedCollection")
                  .isEqualTo(expected);
assertThat(actual.getUnorderedCollection()).hasSameElementsAs(expected.getUnorderedCollection());

to have option to ignore collection order like this:

assertThat(actual).usingRecursiveComparison()
                  .ignoringCollectionOrderInFields("unorderedCollection")
                  .isEqualTo(expected);

[joel-costigliola]

Sure, I had a bullet point in #1002 for it.

[joel-costigliola]

@zeljko-mirovic do you have a use case where specifying fields is necessary ?
I was at first considering a global option ignoringCollectionOrder() for all collections.

[zeljko-mirovic]

Yes I do.
I am asserting complex DTO generated by maven plugin. All collections in DTO are Lists but some of them are backed up by entities using Lists and some by entities using Sets.

[joel-costigliola]

alright fair enough.