Added default check for mbed_app.json

Author: Jenny Plunkett

tools/test_configs/__init__.py

@@ -1,4 +1,4 @@
-from os.path import dirname, abspath, join
+from os.path import dirname, abspath, join, exists
 
 from tools.utils import json_file_to_dict
 from tools.targets import TARGET_MAP
@@ -28,12 +28,14 @@ def get_config_path(conf_name, target_name):
     else:
         return None
 
-def get_default_config(target_name):
+def get_default_config(source_dir, target_name):
     if target_name in TARGET_CONFIGS:
         config_name = TARGET_CONFIGS[target_name]['default_test_configuration']
         if config_name == "NONE":
             return None
         return join(CONFIG_DIR, CONFIG_MAP[config_name])
+    elif any(exists(join(dir or ".", "mbed_app.json")) for dir in source_dir):
+        config = None
     elif (target_name in TARGET_MAP and 'LWIP' in TARGET_MAP[target_name].features):
         return join(CONFIG_DIR, CONFIG_MAP["ETHERNET"])
     else: