Print the array module version in the tests header

Author: asmeurer

conftest.py

@@ -13,7 +13,7 @@
 from array_api_tests import api_version
 from array_api_tests._array_module import _UndefinedStub
 from array_api_tests.stubs import EXTENSIONS
-from array_api_tests import xp_name
+from array_api_tests import xp_name, xp as array_module
 
 from reporting import pytest_metadata, pytest_json_modifyreport, add_extra_json_metadata # noqa
 
@@ -23,7 +23,12 @@ def pytest_report_header(config):
         ext for ext in EXTENSIONS + ['fft'] if ext not in disabled_extensions and xp_has_ext(ext)
     })
 
-    return f"Array API Tests Module: {xp_name}. API Version: {api_version}. Enabled Extensions: {', '.join(enabled_extensions)}"
+    try:
+        array_module_version = array_module.__version__
+    except AttributeError:
+        array_module_version = "version unknown"
+
+    return f"Array API Tests Module: {xp_name} ({array_module_version}). API Version: {api_version}. Enabled Extensions: {', '.join(enabled_extensions)}"
 
 def pytest_addoption(parser):
     # Hypothesis max examples