bats/helpers: Add run convenience functions
#196
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Also adds `restore_programs_in_path`, which allows a single call to remove multiple command stub scripts. `run_test_script` creates and runs a test script in one step, so that `create_bats_test_script` and `run` need not be called separately. `run_bats_test_suite` is a specialized version of `run_test_script` specifically for generating and running Bats test cases. `run_bats_test_suite_in_isolation` is an even more specialized version of `run_bats_test_suite` to ensure that `PATH` is restricted to `BATS_TEST_BINDIR` and the Bats `libexec/` directory within the suite. Along with `stub_program_in_path` and `create_forwarding_script`, this is useful for testing helper functions whose behavior depends on the available system commands, such as `skip_if_...` helpers.
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Also adds
restore_programs_in_path, which allows a single call to remove multiple command stub scripts.run_test_scriptcreates and runs a test script in one step, so thatcreate_bats_test_scriptandrunneed not be called separately.run_bats_test_suiteis a specialized version ofrun_test_scriptspecifically for generating and running Bats test cases.run_bats_test_suite_in_isolationis an even more specialized version ofrun_bats_test_suiteto ensure thatPATHis restricted toBATS_TEST_BINDIRand the Batslibexec/directory within the suite. Along withstub_program_in_pathandcreate_forwarding_script, this is useful for testing helper functions whose behavior depends on the available system commands, such asskip_if_...helpers.