test(browser): add regression coverage

src/browser/pw-role-snapshot.test.ts

@@ -1,6 +1,9 @@
 import { describe, expect, it } from "vitest";
 
-import { buildRoleSnapshotFromAriaSnapshot } from "./pw-role-snapshot.js";
+import {
+  buildRoleSnapshotFromAriaSnapshot,
+  getRoleSnapshotStats,
+} from "./pw-role-snapshot.js";
 
 describe("pw-role-snapshot", () => {
   it("adds refs for interactive elements", () => {
@@ -42,4 +45,14 @@ describe("pw-role-snapshot", () => {
     expect(res.snapshot).toContain("  - group");
     expect(res.snapshot).not.toContain("button");
   });
+
+  it("computes stats", () => {
+    const aria = ['- button "OK"', '- button "Cancel"'].join("\n");
+    const res = buildRoleSnapshotFromAriaSnapshot(aria);
+    const stats = getRoleSnapshotStats(res.snapshot, res.refs);
+    expect(stats.refs).toBe(2);
+    expect(stats.interactive).toBe(2);
+    expect(stats.lines).toBeGreaterThan(0);
+    expect(stats.chars).toBeGreaterThan(0);
+  });
 });