Bats is a TAP\-compliant testing framework for Bash\. It provides a simple way to verify that the UNIX programs you write behave as expected\.
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A Bats test file is a Bash script with special syntax for defining test cases\. Under the hood, each test case is just a function with a description\.
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Test cases consist of standard shell commands\. Bats makes use of Bash\'s \fBerrexit\fR (\fBset \-e\fR) option when running test cases\. If every command in the test case exits with a \fB0\fR status code (success), the test passes\. In this way, each line is an assertion of truth\.
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See \fBbats\fR(7) for more information on writing Bats tests\.
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.SH"RUNNING TESTS"
To run your tests, invoke the \fBbats\fR interpreter with a path to a test file\. The file\'s test cases are run sequentially and in isolation\. If all the test cases pass, \fBbats\fR exits with a \fB0\fR status code\. If there are any failures, \fBbats\fR exits with a \fB1\fR status code\.
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You can invoke the \fBbats\fR interpreter with multiple test file arguments, or with a path to a directory containing multiple \fB\.bats\fR files\. Bats will run each test file individually and aggregate the results\. If any test case fails, \fBbats\fR exits with a \fB1\fR status code\.
\fB\-\-code\-quote\-style <style>\fR: A two character string of code quote delimiters or \fBcustom\fR which requires setting \fB$BATS_BEGIN_CODE_QUOTE\fR and \fB$BATS_END_CODE_QUOTE\fR\. Can also be set via \fB$BATS_CODE_QUOTE_STYLE\fR\.
When you run Bats from a terminal, you\'ll see output as each test is performed, with a check\-mark next to the test\'s name if it passes or an "X" if it fails\.
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.IP""4
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.nf
$ bats addition\.bats
✓ addition using bc
✓ addition using dc
2 tests, 0 failures
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.fi
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.IP""0
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If Bats is not connected to a terminal\-\-in other words, if you run it from a continuous integration system or redirect its output to a file\-\-the results are displayed in human\-readable, machine\-parsable TAP format\. You can force TAP output from a terminal by invoking Bats with the \fB\-\-tap\fR option\.
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.IP""4
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.nf
$ bats \-\-tap addition\.bats
1\.\.2
ok 1 addition using bc
ok 2 addition using dc
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.fi
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.IP""0
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.SH"EXIT STATUS"
The \fBbats\fR interpreter exits with a value of \fB0\fR if all test cases pass, or \fB1\fR if one or more test cases fail\.