run only impacted tests

Author: ABHISHEKSONI121

.github/workflows/python-app.yml

@@ -31,7 +31,7 @@ jobs:
     - name: Test with pytest
       run: |
        git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*
-       git diff origin/main HEAD --name-only -- practice | xargs dirname | sort | uniq | xargs 
+       git diff origin/main HEAD --name-only -- practice | xargs dirname | sort | uniq | xargs pytest
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names