tldr/pages/common/test.md

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# test
> Evaluate condition.
> If it is true, returns 0 exit status, otherwise returns 1.
- Test if given variable is equal to given string
`test $MY_VAR == '/bin/zsh'`
- Test if given variable is empty
`test -z $GIT_BRANCH`
- Test if file exists
`test -e {{filename}}`
- Test if directory not exists
`test ! -d {{path/to/directory}}`
- If-else statement
`test {{condition}} && echo "true" || echo "false"`