no log: Add tests header warning

dev-requirements.txt

@@ -7,3 +7,4 @@ pytest-cov
 pytest-vcr
 pytest-mock
 requests-mock
+setuptools

tests/conftest.py

@@ -1,6 +1,32 @@
 # -*- coding: utf-8 -*-
 import os
+import pkgutil
 import sys
 
+import pkg_resources
+
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), "../libs/"))
 sys.path.insert(0, os.path.join(os.path.dirname(__file__), "../bazarr/"))
+
+
+def pytest_report_header(config):
+    conflicting_packages = _get_conflicting("libs")
+    if conflicting_packages:
+        return f"Conflicting packages detected:\n{conflicting_packages}"
+
+
+def _get_conflicting(path):
+    libs_packages = []
+    for _, package_name, _ in pkgutil.iter_modules([path]):
+        libs_packages.append(package_name)
+
+    installed_packages = pkg_resources.working_set
+    package_names = [package.key for package in installed_packages]
+    unique_package_names = set(package_names)
+
+    conflicting = []
+    for installed in unique_package_names:
+        if installed in libs_packages:
+            conflicting.append(installed)
+
+    return conflicting