tests: add `--branch` to coverage run (#2825)

diff --git a/scripts/test b/scripts/test
index 720a66392d6260c8535a6e5908f4c0d09412de79..17dd9fb69d1bb36524ad1e4a2debf173f37cb06d 100755 (executable)
--- a/scripts/test
+++ b/scripts/test
@@ -11,7 +11,10 @@ if [ -z $GITHUB_ACTIONS ]; then
     scripts/check
 fi
 
-${PREFIX}coverage run -m pytest $@
+# TODO: Remove this custom logic, and add `branch = true` to the `[coverage.run]` when we drop support for Python 3.9.
+# See https://github.com/encode/starlette/issues/2452.
+branch_option=$(python -c 'import sys; print("--branch" if sys.version_info >= (3, 10) else "")')
+${PREFIX}coverage run $branch_option -m pytest $@
 
 if [ -z $GITHUB_ACTIONS ]; then
     scripts/coverage