feat: add file_basename_equals, file_extension_in matchers These come from some of experience from porting the cc rules to use rules_testing * Also moves the matcher tests into their own file because the truth_tests.bzl file is getting large. * Also switches the matcher tests to be basic tests, since they don't really require a target graph to be setup. Fixed #44
rules_testing provides frameworks and utilities to make testing Starlark code easier and convenient.
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