Add stub_program_in_path Bats helper, apply assert_file_* everywhere
#106
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Much easier and more convenient than having to hand-roll `PATH` program stubs for every new test suite.
Also documents how to check for completely empty output or files, both in assertion comments and with new test cases in `tests/assertions.bats`.
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More work pertaining to #40.
Introduces the new
stub_program_in_pathfunction inlib/bats/helpers, which makes it super easy to stub out system programs by injecting testing stub implementations into thePATHof tests that call the function.Also updates a number of tests to use the
assert_file_*functions, and includes new comments and test cases indicating how to check for completely empty output or files.