Wiki title prefix policy

internal/project/project_test.go

@@ -266,6 +266,7 @@ topdata:
     manual_sections_dir: manual-sections
     deploy_manifest: wiki-manifest.json
     deploy_edit_summary: Custom summary
+    title_prefix_min_length: 4
     stale_pages:
       default: report
       live_cleanup: archive
@@ -330,6 +331,9 @@ autogen:
 	if got, want := effective.TopData.Wiki.StalePages.LiveCleanup, "archive"; got != want {
 		t.Fatalf("expected wiki stale live cleanup %q, got %q", want, got)
 	}
+	if got, want := effective.TopData.Wiki.TitlePrefixMinLength, 4; got != want {
+		t.Fatalf("expected wiki title prefix minimum length %d, got %d", want, got)
+	}
 	if got, want := effective.Autogen.Cache.MaxAge, "30m"; got != want {
 		t.Fatalf("expected autogen cache max age %q, got %q", want, got)
 	}