TOOLS: fix failed python test

Author: Qinghao Shi

tools/build_api.py

@@ -454,6 +454,7 @@ def prepare_toolchain(src_paths, build_dir, target, toolchain_name,
     app_config - location of a chosen mbed_app.json file
     build_profile - a list of mergeable build profiles
     ignore - list of paths to add to mbedignore
+    coverage_patterns - list of patterns for code coverage
     """
 
     # We need to remove all paths which are repeated to avoid

tools/toolchains/arm.py

@@ -63,7 +63,7 @@ def check_executable():
         return mbedToolchain.generic_check_executable("ARM", 'armcc', 2, 'bin')
 
     def __init__(self, target, notify=None, macros=None,
-                 build_profile=None, build_dir=None):
+                 build_profile=None, build_dir=None, coverage_patterns=None):
         mbedToolchain.__init__(
             self, target, notify, macros, build_dir=build_dir,
             build_profile=build_profile)
@@ -440,15 +440,17 @@ def __init__(
             notify=None,
             macros=None,
             build_profile=None,
-            build_dir=None
+            build_dir=None,
+            coverage_patterns=None
     ):
         ARM.__init__(
             self,
             target,
             notify,
             macros,
             build_dir=build_dir,
-            build_profile=build_profile
+            build_profile=build_profile,
+            coverage_patterns=None
         )
         if int(target.build_tools_metadata["version"]) > 0:
             # check only for ARMC5 because ARM_STD means using ARMC5, and thus

tools/toolchains/iar.py

@@ -44,7 +44,7 @@ def check_executable():
         )
 
     def __init__(self, target, notify=None, macros=None, build_profile=None,
-                 build_dir=None):
+                 build_dir=None, coverage_patterns=None):
         mbedToolchain.__init__(
             self,
             target,