Testing.md

@@ -4,19 +4,30 @@ In order to assure that the preprocessor and building scripts work as intended,
 
 # Test Template
 
-Each test has 4 stages:
-* Prepare variables
+Each test has 5 stages:
+* [Prepare generic variables](#genericvariables).
 * Run the script to be tested (with different combinations of input arguments
-* Check the result, usually via a [`diff`](https://en.wikipedia.org/wiki/Diff) command.
-* Exit with exit code `1` if script is failed or continue with next test.
+* Compare the output with a reference file usually via a [`diff`](https://en.wikipedia.org/wiki/Diff) command.
+* Check whether all files where created using `if [ -f ...]` 
+* Exit with exit code `1` if script has failed or continue with next test.
+
+## Generic Variables
+
+In order to modularize tests, the following generic variables are used:
+
+| Name | Description | Example Value |
+| ---- | ----------- | ------- |
+|`$RESEARCH_TESTING` |  The base directory for this test | `$RESEARCH_ROOT/testing/test_preproc_wg.log` |
+| `$LOGFILE` | The name of the logfile for this test | `$RESEARCH_ROOT/log/preproc_wg.log` |
+| `$SCRIPT` | The basic command that is tested | `$RESEARCH_ROOT/bin/preproc_wg.sh` |
 
 ## Plain template 
 
 Use this template in order to register new tests; replace `NN` and `Description` accordingly:
 
 ```bash
-#BEGIN Test 1: Description
-T=1
+#BEGIN Test NN: Description
+T=NN
 #echo "##################################################"
 echo "Test $T: Description" 
 #echo "##################################################"