Use pytest-cov plugin for getting coverage

Change-Id: Ifb5db0e8b1e12cf7d14045c2ccc7fc5ebfeaa40b

extra-requirements.txt

@@ -1,6 +1,9 @@
+# Additional requirements not in openstack/requirements project
+
 ansi2html                # LGPLv3+
 pandas                   # BSD
 podman                   # Apache-2.0
+pytest-cov               # MIT
 pytest-rerunfailures     # MPL-2.0
 pytest-timeout           # MIT
 validations-libs         # APACHE-2.0

test-requirements.txt

@@ -1,6 +1,5 @@
-# Unit tests requirements
+# Test cases requirements
 
-coverage>=5.3.1                # Apache-2.0
 mock>=3.0.5                    # BSD
 psutil>=5.8.0                  # BSD
 pytest>=6.2.1                  # MIT

tools/run_tests.py

@@ -54,10 +54,7 @@ TOX_RUN_TESTS_TIMEOUT = float(os.environ.get('TOX_RUN_TESTS_TIMEOUT') or 0.)
 TOX_RERUNS = int(os.environ.get('TOX_RERUNS') or 0)
 TOX_RERUNS_DELAY = int(os.environ.get('TOX_RERUNS_DELAY') or 5)
 
-
-TOX_PYDEV_DEBUG = bool(
-    os.environ.get('TOX_PYDEV_DEBUG', 'false').lower() in
-    ['true', 'yes', '1'])
+TOX_COVER = bool(os.environ.get('TOX_COVER', 'false').lower() in ['1', 'yes', 'true'])
 
 
 def main():
@@ -81,10 +78,6 @@ def run_tests():
     cleanup_report_dir()
     log_environ()
 
-    if TOX_PYDEV_DEBUG:
-        debug_test_cases()
-        return True
-
     succeeded = True
     try:
         run_test_cases()
@@ -144,9 +137,13 @@ def run_test_cases():
     rerun_options = ''
     if TOX_RERUNS:
         rerun_options = f"--reruns '{TOX_RERUNS}' --reruns-delay '{TOX_RERUNS_DELAY}'"
+    cover_options = ''
+    if TOX_COVER:
+        cover_options = f"--cov=tobiko"
     common.execute(f"pytest "
                    f"{xdist_options} "
                    f"{rerun_options} "
+                   f"{cover_options} "
                    f"--log-file={TOX_REPORT_LOG} "
                    f"--junitxml={TOX_REPORT_XML} "
                    f"--junit-prefix={TOX_REPORT_NAME} "

tox.ini

@@ -31,6 +31,8 @@ setenv =
     PYTHONWARNINGS = ignore::Warning,{env:PYTHONWARNINGS:}
     RUN_TESTS_EXTRA_ARGS = {env:OS_TEST_PATH}
     TOBIKO_PREVENT_CREATE = {env:TOBIKO_PREVENT_CREATE:false}
+    TOX_COVER = {env:TOX_COVER:false}
+    TOX_COVER_DIR = {env:TOX_COVER_DIR:{toxinidir}/cover}
     TOX_NUM_PROCESSES = {env:TOX_NUM_PROCESSES:auto}
     TOX_REPORT_NAME = {env:TOX_REPORT_NAME:tobiko_results_{envname}}
     TOX_REPORT_DIR = {env:TOX_REPORT_DIR:{envlogdir}}
@@ -54,17 +56,13 @@ basepython = {[testenv:py3]basepython}
 envdir = {[testenv:py3]envdir}
 setenv =
     {[testenv]setenv}
-    PYTHON = coverage run --parallel-mode
+    TOX_COVER = true
     TOX_COVER_DIR={env:TOX_COVER_DIR:{toxinidir}/cover}
+
 commands =
-    find . -type f -name ".coverage.*" -delete
-    coverage erase
     {[testenv]commands}
-    coverage combine
     coverage html -d "{env:TOX_COVER_DIR}"
-    coverage xml -o "{env:TOX_COVER_DIR}/cover/coverage.xml"
-    coverage report --skip-covered
-    find . -type f -name ".coverage.*" -delete
+    coverage xml -o "{env:TOX_COVER_DIR}/coverage.xml"
 whitelist_externals =
     find