Add: test-case to validate the run is successful when there are no warnings/errors

Author: TrueBrain

.github/workflows/testing.yml

@@ -6,8 +6,8 @@ on:
     - master
 
 jobs:
-  run_action:
-    name: Test run action
+  run_action_warnings:
+    name: Test run action (triggers warnings)
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
@@ -17,6 +17,15 @@ jobs:
         only_warn: 1
         max_line_length: 90
 
+  run_action_valid:
+    name: Test run action (valid)
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: ./
+      with:
+        path: example_valid
+
   codespell:
     name: Check for spelling errors
     runs-on: ubuntu-latest

example_valid/example.py

@@ -0,0 +1,2 @@
+def good_code():
+    pass