PYTHON-5754 Fix USE_ACTIVE_VENV support (#2728)

.evergreen/scripts/setup_tests.py

@@ -153,6 +153,10 @@ def handle_test_env() -> None:
     # Start compiling the args we'll pass to uv.
     UV_ARGS = ["--extra test --no-group dev"]
 
+    # If USE_ACTIVE_VENV is set, add --active to UV_ARGS so run-tests.sh uses the active venv.
+    if is_set("USE_ACTIVE_VENV"):
+        UV_ARGS.append("--active")
+
     test_title = test_name
     if sub_test_name:
         test_title += f" {sub_test_name}"

justfile

@@ -57,7 +57,9 @@ lint-manual *args="": && resync
 
 [group('test')]
 test *args="-v --durations=5 --maxfail=10": && resync
-    uv run --extra test python -m pytest {{args}}
+    #!/usr/bin/env bash
+    set -euo pipefail
+    uv run ${USE_ACTIVE_VENV:+--active} --extra test python -m pytest {{args}}
 
 [group('test')]
 test-numpy *args="": && resync