use specific python version

Author: blink1073

.evergreen/run-tests.sh

@@ -31,9 +31,10 @@ if [ -f "./secrets-export.sh" ]; then
 fi
 
 # List the packages.
-PIP_QUIET=0 uv run ${UV_ARGS} --with pip pip list
+uv sync ${UV_ARGS}
+uv pip list
 
 # Start the test runner.
-uv run ${UV_ARGS} .evergreen/scripts/run_tests.py "$@"
+uv run .evergreen/scripts/run_tests.py "$@"
 
 popd

.evergreen/scripts/run_tests.py

@@ -4,7 +4,6 @@
 import logging
 import os
 import platform
-import shutil
 import sys
 from datetime import datetime
 
@@ -142,10 +141,6 @@ def run() -> None:
     if TEST_PERF:
         handle_perf(start_time)
 
-    # Handle coverage post actions.
-    if os.environ.get("COVERAGE"):
-        shutil.rmtree(".pytest_cache", ignore_errors=True)
-
 
 if __name__ == "__main__":
     run()

.evergreen/scripts/setup_tests.py

@@ -43,6 +43,9 @@
 # Map the test name to test group.
 GROUP_MAP = dict(mockupdb="mockupdb", perf="perf")
 
+# The python version used for perf tests.
+PERF_PYTHON_VERSION = "3.9.13"
+
 
 def is_set(var: str) -> bool:
     value = os.environ.get(var, "")
@@ -371,6 +374,8 @@ def handle_test_env() -> None:
         write_env("TEST_PATH", str(data_dir))
         write_env("OUTPUT_FILE", str(ROOT / "results.json"))
 
+        UV_ARGS.append(f"--python={PERF_PYTHON_VERSION}")
+
         # PYTHON-4769 Run perf_test.py directly otherwise pytest's test collection negatively
         # affects the benchmark results.
         if sub_test_name == "sync":

.evergreen/scripts/teardown_tests.py

@@ -57,4 +57,8 @@
 
     teardown_mod_wsgi()
 
+# Tear down coverage if applicable.
+if os.environ.get("COVERAGE"):
+    shutil.rmtree(".pytest_cache", ignore_errors=True)
+
 LOGGER.info(f"Tearing down tests of type '{TEST_NAME}'... done.")