test: refac fb_user test

test/test_fb_users.py

 from helper import *
 import json
 from test_users import run_user, assert_exec_time_equals_profile
+
+##### Utils... #####
 Workload = namedtuple('Workload', ['name', 'filename'])
 Platform = namedtuple('Platform', ['name', 'filename'])
 
 empty_workload = Workload(
     name='empty_workload', filename='test/workloads/multicore/empty_workload.json')
-
 two_machine_platform = Platform(
     name='two_machine_platform', filename='test/platforms/multicore/toy_pform_taurus_like.xml')
 
-users = [
-    "fb_user_think_time_only",
-]
-
-
 def make_user_description_file(file_path, user_name, user_category, input_json):
     user_description = {
         "users": [
@@ -30,11 +26,7 @@ def make_user_description_file(file_path, user_name, user_category, input_json):
     with open(file_path, 'w') as user_description_file:
         json.dump(user_description, user_description_file)
 
-
-def test_tt_only_simple_workload():
-    user_category = 'fb_user_think_time_only'
-    test_input = 'proto_SABjson_v2'
-
+def launch_fb_test(user_category, test_input):
     make_user_description_file(
         file_path=f'test/schedconf/{user_category}.json',
         user_name=user_category,
@@ -45,17 +37,14 @@ def test_tt_only_simple_workload():
                        empty_workload, test_name=f'{user_category}-{test_input}')
     assert_exec_time_equals_profile(out_dir)
 
+##### Tests #####
+def test_tt_only_simple_workload():
+    """A simple SAB json. See diagram https://app.diagrams.net/#G1tbo7oHahsgxTmhICucCGam5XNtshOUOb"""
+    launch_fb_test(user_category = 'fb_user_think_time_only',
+                   test_input = 'proto_SABjson_v2')
 
-def test_tt_only_fully_loaded_platform():
-    user_category = 'fb_user_think_time_only'
-    test_input = 'load_platform'
 
-    make_user_description_file(
-        file_path=f'test/schedconf/{user_category}.json',
-        user_name=user_category,
-        user_category=user_category,
-        input_json=f"test/workloads/SABjson/{test_input}.json")
-
-    out_dir = run_user(user_category, two_machine_platform,
-                       empty_workload, test_name=f'{user_category}-{test_input}')
-    assert_exec_time_equals_profile(out_dir)
+def test_tt_only_fully_loaded_platform():
+    """Test feedback when platform is fully loaded."""
+    launch_fb_test(user_category = 'fb_user_think_time_only',
+                   test_input = 'load_platform')

test/workloads/SABjson/load_platform.json

 {
-    "description": "Test feedback when  platform is fully loaded.",
+    "description": "Test feedback when platform is fully loaded.",
     "nb_res": 16,
     "sessions": [
         {