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POBash and Test-Driven Development
 

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    <p>When writing more than a trivial script in bash, I often wonder how to make the code testable.</p> <p>It is typically hard to write tests for bash code, due to the fact that it is low on functions that take a value and return a value, and high on functions that check and set some aspect in the environment, modify the file-system, invoke a program, etc. - functions that depend on the environment or have side effects. Thus the setup and test code become much more complicated than the code they test.</p> <hr> <p>For example, consider a simple function to test:</p> <pre><code>function add_to_file() { local f=$1 cat &gt;&gt; $f sort -u $f -o $f } </code></pre> <p>Test code for this function might consist of:</p> <p>add_to_file.before:</p> <pre><code>foo bar baz </code></pre> <p>add_to_file.after:</p> <pre><code>bar baz foo qux </code></pre> <p>And test code:</p> <pre><code>function test_add_to_file() { cp add_to_file.{before,tmp} add_to_file add_to_file.tmp cmp add_to_file.{tmp,after} &amp;&amp; echo pass || echo fail rm add_to_file.tmp } </code></pre> <p>Here 5 lines of code are tested by 6 lines of test code and 7 lines of data.</p> <hr> <p>Now consider a slightly more complicated case:</p> <pre><code>function distribute() { local file=$1 ; shift local hosts=( "$@" ) for host in "${hosts[@]}" ; do rsync -ae ssh $file $host:$file done } </code></pre> <p>I can't even say how to start write a test for that...</p> <hr> <p>So, is there a good way to do TDD in bash scripts, or should I give up and put my efforts elsewhere?</p>
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    1. COsee also: http://stackoverflow.com/questions/1339416/testing-bash-scripts
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