Add testing documentation to README

README.md

@@ -8,3 +8,10 @@ Provides some nice utility methods for bash scripts.
 
 ## Documentation
 See [bashutils.staropensource.de](https://bashutils.staropensource.de)
+
+## Testing
+You run bashutils' tests by invoking the `test.sh` script.
+The test script accepts environment variables as configuration.
+### Configuration
+| VARIABLE   | TYPE | DEFAULT | DESCRIPTION                                      |
+| `FAILFAST` | bool | `false` | Terminates if a test fails instead of continuing |

test.sh

@@ -2,6 +2,8 @@
 set -uo pipefail
 IFS=$'\n'
 
+unset TEST TESTS
+
 TESTS="
 # Logging
 logger_diag
@@ -25,7 +27,7 @@ check_command_defined
 function invalid() { echo ":: Error: Invalid test ${TEST}, skipping"; }
 function fail() {
   echo -e ":: Test ${TEST} failed\n   ${*//\\n/\\n   }"
-  [ -n "${FAILFAST}" ] && exit 1
+  [ "${TEST_FAILFAST}" == "true" ] && exit 1
 }
 ## Assertions
 function assert_equals() {