Add multi-checker

[hpidcock]

MultiChecker allows you to perform a DeepEquals but have bespoke checkers based on path matching.

For example, this allows the value at "b" to be ignored.

a1 := map[string]string{"a": "a", "b": "b", "c": "c"}
a2 := map[string]string{"a": "a", "b": "bbbb", "c": "c"}

checker := jc.NewMultiChecker().Add(`["b"]`, jc.Ignore)
c.Check(a1, checker, a2)

This allows the second element to have the SameContents check applied, ignoring order of elements:

a1 := [][]string{{"a", "b", "c"}, {"c", "d", "e"}}
a2 := [][]string{{"a", "b", "c"}, {"e", "c", "d"}}

checker := jc.NewMultiChecker().Add("[1]", jc.SameContents, jc.ExpectedValue)
c.Check(a1, checker, a2)

[hpidcock]

!!build!!

[hpidcock]

!!build!!

[hpidcock]

!!build!!

[hpidcock]

!!build!!

[wallyworld]

Nice improvement

[wallyworld]

does this need to be exported?

[hpidcock]

$$merge$$