Updated bash testing suite

As a followup to last week's testing post I wanted to expand from a test script, to a testing suite.

Anyone familiar with TDD will often see something like a `tests` directory and a simple `run_tests` script. I wanted to do this in bash.

Using the same style trapping as before, with a simple change, we can achieve a nice result.

#!/usr/local/bin/bash

set -o pipefail

# Begin tests

function error_exit() {

  echo -e "\E[31mTest $TEST failed\E[0m"

  exit 1

}

function success_exit() {

  echo -e "\E[32m $TEST OK\E[0m"

}

trap "error_exit" ERR

trap "success_exit" RETURN

for i in `ls tests/*`; do

  source $i
done

Any file in the tests directory will be evaluated and the results will be reported through the run_tests script

Here's some sample tests:

ls tests/

01-file.sh 02-cows

looking at tests/01-file.sh

export TEST="File exists"

find . -name file &>/dev/null

looking at tests/02-cows:

export TEST="File has cows"

grep -q cows file

Super simple, no shebang interpreter needed, not even an executable file. All we need is to set the value of $TEST to something meaningful. Here's what the test run looks like:

 $ ./run_tests.sh 

 File exists OK

Test File has cows failed

Lets see what's wrong with this...

cat file 

Cows

Ah... wrong case, lets fix that:

 cat file 

cows

$ ./run_tests.sh 

 File exists OK

 File has cows OK