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- Read TEST_TAG/TEST_FILTER env vars from cmake/RunTests.cmake. Setting these environment variables will pass --tags/--filter to busted, which can used to filter which tests are executed. - Remove calls to nvim msgpack-rpc API outside tests. This removes the requirement of having a static `clear` call in test/functional/helpers.lua - Use the new busted command-line option "--lazy" to ensure the setup/teardown hooks are only executed when a suite runs at least one test. Now its possible to run/debug a single test like this: ```sh TEST_FILTER='some test string' make test ``` Which will only run tests containing "some test string" in the title. Another option is: ```sh TEST_TAG=some-tag make test ``` After putting #some-tag into the test title. This also improves debugging experience because there will be no unnecessary gdbserver instances whe GDB=1 is passed.