ADD test directory itself to coverage ommit

.github/workflows/unittest-and-coverage.yml

@@ -30,7 +30,7 @@ jobs:
     - name: Run tests with coverage
       # pyjexl code is omit as it doesn't belong to us
       run: |
-        coverage run --omit=tcjexl/pyjexl/** -m pytest
+        coverage run --omit=tcjexl/pyjexl/**,tests/** -m pytest
 
     - name: Generate coverage report
       run: |