Have IdentityConversion flag com.google.errorprone.matchers.Matchers#{allOf,anyOf}

[EvgheniiShipilov]

Check for cases when allOf and anyOf Matchers have a single parameter. Such cases can be rewritten by simply omitting the respective method.

• Solves Drop redundant Matchers.{allOf,anyOf} containing a single Matcher #340

Suggested commit message:

Drop redundant Matchers.{allOf,anyOf} containing a single Matcher

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[rickie]

Added a commit.

Alternative suggested commit message:

Have `IdentityConversion` flag `com.google.errorprone.matchers.Matchers#{allOf,anyOf}` (#420)

Thanks for opening a PR @EvgheniiShipilov , it looks good 🚀!

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[Stephan202]

Rebased and added a commit. Expanding on @rickie's suggested commit message:

Have `IdentityConversion` flag `com.google.errorprone.matchers.Matchers#{allOf,anyOf}` (#420)

While there, sort and rename some (test) code.

Fixes #340.

[Stephan202]

We can also move these up a bit, in line with the main code order. (Edit: seems there are other inconsistencies. Will move some stuff around.)

Next to that:

1. We can use simpler expressions for this test.
2. We should do this more generally, but since it's cheap for this case: let's also add some non-matching cases.

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[rickie]

Changes LGTM @Stephan202!