Modify pytest coverage to use coverage command instead

Author: rhatgadkar-goog

noxfile.py

@@ -129,17 +129,27 @@ def default(session, path):
     session.install(".")
     session.install("-r", "requirements.txt")
     # Run pytest with coverage.
+    # Using the coverage command instead of `pytest --cov`, because
+    # `pytest ---cov` causes the module to be initialized twice, which returns
+    # this error: "ImportError: PyO3 modules compiled for CPython 3.8 or older
+    # may only be initialized once per interpreter process". More info about
+    # this is stated here: https://github.com/pytest-dev/pytest-cov/issues/614.
     session.run(
+        "coverage",
+        "run",
+        "--include=*/google/cloud/alloydb/connector/*.py",
+        "-m",
         "pytest",
-        "--cov=google.cloud.alloydb.connector",
         "-v",
-        "--cov-config=.coveragerc",
-        "--cov-report=",
-        "--cov-fail-under=0",
-        "--junitxml=sponge_log.xml",
         path,
         *session.posargs,
     )
+    session.run(
+        "coverage",
+        "xml",
+        "-o",
+        "sponge_log.xml",
+    )
 
 
 @nox.session(python=UNIT_TEST_PYTHON_VERSIONS)