tldr/pages/common/test.md

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# test
> Evaluate condition.
> Returns 0 if the condition evaluates to true, 1 if it evaluates to false.
> More information: <https://www.gnu.org/software/coreutils/manual/html_node/test-invocation.html>.
- Test if a given variable is equal to a given string:
`test "{{$MY_VAR}}" == "{{/bin/zsh}}"`
- Test if a given variable is empty:
`test -z "{{$GIT_BRANCH}}"`
- Test if a file exists:
`test -f "{{path/to/file_or_directory}}"`
- Test if a directory does not exist:
`test ! -d "{{path/to/directory}}"`
- If-else statement:
`test {{condition}} && {{echo "true"}} || {{echo "false"}}`