1 files changed, 72 insertions, 0 deletions
diff --git a/remote/test/puppeteer/packages/browsers/test/src/Cache.spec.ts b/remote/test/puppeteer/packages/browsers/test/src/Cache.spec.ts
new file mode 100644
index 0000000000..e8a3fb9619
--- /dev/null
+++ b/remote/test/puppeteer/packages/browsers/test/src/Cache.spec.ts
@@ -0,0 +1,72 @@
+/**
+ * @license
+ * Copyright 2024 Google Inc.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import assert from 'assert';
+import fs from 'fs';
+import os from 'os';
+import path from 'path';
+
+import {Browser, Cache} from '../../lib/cjs/main.js';
+
+describe('Cache', () => {
+  let tmpDir = '/tmp/puppeteer-browsers-test';
+  let cache: Cache;
+
+  beforeEach(() => {
+    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'puppeteer-browsers-test'));
+    cache = new Cache(tmpDir);
+  });
+
+  afterEach(() => {
+    cache.clear();
+  });
+
+  it('return empty metadata if .metadata file does not exist', async function () {
+    assert.deepStrictEqual(cache.readMetadata(Browser.CHROME), {
+      aliases: {},
+    });
+  });
+
+  it('throw an error if .metadata is malformed', async function () {
+    // @ts-expect-error wrong type on purpose;
+    cache.writeMetadata(Browser.CHROME, 'metadata');
+    assert.throws(() => {
+      return cache.readMetadata(Browser.CHROME);
+    }, new Error(`.metadata is not an object`));
+  });
+
+  it('writes and reads .metadata', async function () {
+    cache.writeMetadata(Browser.CHROME, {
+      aliases: {
+        canary: '123.0.0.0',
+      },
+    });
+    assert.deepStrictEqual(cache.readMetadata(Browser.CHROME), {
+      aliases: {
+        canary: '123.0.0.0',
+      },
+    });
+
+    assert.deepStrictEqual(
+      cache.resolveAlias(Browser.CHROME, 'canary'),
+      '123.0.0.0'
+    );
+  });
+
+  it('resolves latest', async function () {
+    cache.writeMetadata(Browser.CHROME, {
+      aliases: {
+        canary: '115.0.5789',
+        stable: '114.0.5789',
+      },
+    });
+
+    assert.deepStrictEqual(
+      cache.resolveAlias(Browser.CHROME, 'latest'),
+      '115.0.5789'
+    );
+  });
+});