Make test script independent of pwd

Author: pimterry

test.sh

@@ -1,2 +1,7 @@
-# Run this file to run all the tests, once
+#!/usr/bin/env bash
+
+# Run this file to run all the tests in test/*.bats
+
+parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )
+cd "$parent_path"
 ./test/libs/bats/bin/bats test/*.bats