Capture All Groups in the Field Trial For Testing Studies

tools/variations/unittest_data/test_config.json

 {
-  "TestStudy1": [
+  "TestTrial1": [
     {"group_name": "TestGroup1"}
   ],
-  "TestStudy2": [
+  "TestTrial2": [
     {
       "group_name": "TestGroup2",
       "params": {
         "x": "1",
         "y": "2"
       },
       "enable_features": ["A", "B"],
       "disable_features": ["C"]
+    },
+    {
+      "group_name": "TestGroup2-2",
+      "params": {
+        "x": "3",
+        "y": "4"
+      },
+      "enable_features": ["D", "E"],
+      "disable_features": ["F"]
     }
   ],
-  "TestStudy3": [
+  "TestTrial3": [
     {"group_name": "TestGroup3", "enable_features": ["X"]}
   ]
-}
+}