RFR: 8065554: MatchResult should provide values of named-capturing groups [v4]

[Stuart Marks]

On Mon, 29 Aug 2022 13:49:52 GMT, Raffaello Giulietti <duke at openjdk.org> wrote:

>> Add support for named groups to java.util.regex.MatchResult
>
> Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8065554: MatchResult should provide values of named-capturing groups

test/jdk/java/util/regex/NamedGroupsTests.java line 45:

> 43: 
> 44:         testMatchResultStartEndGroup();
> 45:     }

I haven't gone through all the tests in great detail (yet), but it occurs to me that we potentially have THREE implementations of some of the logic, and strictly speaking we should test all the code paths. The three implementations are in:

1. Matcher
2. Matcher$ImmutableMatchResult
3. MatchResult's default methods

I took a quick look and it looks like Matcher and Matcher$ImmutableMatchResult override the default methods, so the default methods themselves need to be tested. This is essentially testing the `@implSpec`. The typical way to do that is to have the test create its own MatchResult implementation(s). There might need to be implementations that do and do not implement `namedGroups`, in order to test UOE. They might also need some state to cover various cases of no-match, has-match with and without group names, etc.

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PR: https://git.openjdk.org/jdk/pull/10000