Add a pre-commit hook for long test files

.pre-commit-config.yaml

@@ -34,3 +34,13 @@ repos:
   - repo: meta
     hooks:
       - id: check-useless-excludes
+  - repo: local
+    hooks:
+      - id: long-test-files
+        name: Warn about long unit test files
+        language: script
+        entry: ci/long-test-files.sh
+        # Only run on Arkindex unit test files
+        files: '^arkindex\/[^\/]*\/tests\/(.*\/)?test_.*\.py'
+        # Always show output, even when the hook passes, since the hook only warns and doesn't fail
+        verbose: true

ci/long-test-files.sh

+#!/bin/sh
+wc -l "$@" | awk '$2 != "total" && $1 > 1000 { OFS=""; print $2, " is too long (", $1, " lines)" }'