Test-configuration.md

-## Test .json
+The test configuration is a .json file located in the test directory.
+Here the description of the fields:
+
+*    `name` (string): name of the test. Must be equal to the name of the directory.
+*    `authors` (list of strings): list of authors responsible for this test.
+*    `description` (string): small description of the use case.
+*    `exclude` (list of strings): list of tags to exclude; if a build has at least one tag included in the exclude list, it will be ignored.
+*    `include` (list of strings): list of tags to include; to run this test, a build needs to have all its tags that are included in the include list. 
+*    `modules` (list of strings): list of modules necessary to run this test.
+*    `postprocess` (string): postprocess tool. Choice between `mpio2txt` and `alya2pos`.
+*    `executions` (list of {}): list of the executions. Each item is a dictionnary. Fields of each item are:
+    *    `mpi` (int): number of MPI processes
+    *    `openmp` (int): number of OpenMP threads
+    *    `alya` (string, optional): replacement command for running this test. Replacement values: `[MPI]` (MPI process), `[ALYA]` (alya executable)
+    *    `pp` (string, optional): replacement command for running the post-process. Replacement values: `[ALYA-PATH]` (root path of alya), `[POST]` (postprocess command)
+*    `comparisons` (list of {}): list of the comparisons. Each item is a dictionnary. Fields of each item are:
+    *    `file` (string): file to compare
+    *    `method` (string): comparison method ("between `absolute`, `relative`, `power`)
+    *    `tolerance` (float/int/string): tolerance value associated to the method. Absolute and relative require a float, power an integer. String are converted.
 
 Here, you will find an example of json file for tests:
 
@@ -48,4 +66,4 @@ Here, you will find an example of json file for tests:
     "name": "non_prem_box_SqSq",
     "postprocess": "mpio2txt"
 }
-```
\ No newline at end of file
+```