Fix coverage usage in CI

.gitignore

+hello
+.coverage
+*.pyc
+.pytest_cache/
+*.[oa]
+*~

.gitlab-ci.yml

@@ -49,7 +49,7 @@ tests:
     - ssec_shared
   script:
     - pip install pytest pytest-cov
-    - pytest .
+    - pytest --cov=. test.py
   coverage: '/TOTAL.*\s+(\d+%)$/'
   needs:
     - job: build_hello_world

test.py

@@ -5,7 +5,7 @@
 def test_hello_world_c():
     import subprocess
     bytes_out = subprocess.check_output(['./hello'])
-    assert bytes_out == b'Hello World!\n'
+    assert bytes_out == b'Hello, World!\n'
 
 
 def test_hello_world_py():