1 files changed, 64 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-util-deprecate.js b/tests/node_compat/test/parallel/test-util-deprecate.js
new file mode 100644
index 000000000..2394caa22
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-util-deprecate.js
@@ -0,0 +1,64 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+
+require('../common');
+
+// Tests basic functionality of util.deprecate().
+
+const assert = require('assert');
+const util = require('util');
+
+const expectedWarnings = new Map();
+
+// Emits deprecation only once if same function is called.
+{
+  const msg = 'fhqwhgads';
+  const fn = util.deprecate(() => {}, msg);
+  expectedWarnings.set(msg, { code: undefined, count: 1 });
+  fn();
+  fn();
+}
+
+// Emits deprecation twice for different functions.
+{
+  const msg = 'sterrance';
+  const fn1 = util.deprecate(() => {}, msg);
+  const fn2 = util.deprecate(() => {}, msg);
+  expectedWarnings.set(msg, { code: undefined, count: 2 });
+  fn1();
+  fn2();
+}
+
+// Emits deprecation only once if optional code is the same, even for different
+// functions.
+{
+  const msg = 'cannonmouth';
+  const code = 'deprecatesque';
+  const fn1 = util.deprecate(() => {}, msg, code);
+  const fn2 = util.deprecate(() => {}, msg, code);
+  expectedWarnings.set(msg, { code, count: 1 });
+  fn1();
+  fn2();
+  fn1();
+  fn2();
+}
+
+process.on('warning', (warning) => {
+  assert.strictEqual(warning.name, 'DeprecationWarning');
+  assert.ok(expectedWarnings.has(warning.message));
+  const expected = expectedWarnings.get(warning.message);
+  assert.strictEqual(warning.code, expected.code);
+  expected.count = expected.count - 1;
+  if (expected.count === 0)
+    expectedWarnings.delete(warning.message);
+});
+
+process.on('exit', () => {
+  assert.deepStrictEqual(expectedWarnings, new Map());
+});