equals function
Returns a matcher that matches if the value is structurally equal to
expected.
If expected is a Matcher, then it matches using that. Otherwise it tests
for equality using == on the expected value.
For Iterables and Maps, this will recursively match the elements. To
handle cyclic structures a recursion depth limit can be provided. The
default limit is 100. Sets will be compared order-independently.
Implementation
Matcher equals(expected, [int limit = 100]) => expected is String
? new _StringEqualsMatcher(expected)
: new _DeepMatcher(expected, limit);