Merge pull request #3065 from kmaehashi/bp-2979-v7-test-print-install…

…ed-packages

[backport] Print installed packages in pytest

tests/conftest.py

@@ -0,0 +1,23 @@
+import os
+import subprocess
+import sys
+
+
+def _is_pip_installed():
+    try:
+        import pip  # NOQA
+        return True
+    except ImportError:
+        return False
+
+
+def _is_in_ci():
+    ci_name = os.environ.get('CUPY_CI', '')
+    return ci_name != ''
+
+
+def pytest_configure(config):
+    # Print installed packages
+    if _is_in_ci() and _is_pip_installed():
+        print("***** Installed packages *****", flush=True)
+        subprocess.check_call([sys.executable, '-m', 'pip', 'freeze', '--all'])