From b39170277a588c6d5c6054fbf1c703cec8b71696 Mon Sep 17 00:00:00 2001
From: GitLab Bot <gitlab-bot@gitlab.com>
Date: Mon, 14 Sep 2020 15:02:52 +0000
Subject: Add latest changes from gitlab-org/gitlab@13-3-stable-ee

---
 spec/frontend/helpers/fake_date.js      | 49 +++++++++++++++++++++++++++++++++
 spec/frontend/helpers/fake_date_spec.js | 33 ++++++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100644 spec/frontend/helpers/fake_date.js
 create mode 100644 spec/frontend/helpers/fake_date_spec.js

(limited to 'spec/frontend')

diff --git a/spec/frontend/helpers/fake_date.js b/spec/frontend/helpers/fake_date.js
new file mode 100644
index 00000000000..8417b1c520a
--- /dev/null
+++ b/spec/frontend/helpers/fake_date.js
@@ -0,0 +1,49 @@
+// Frida Kahlo's birthday (6 = July)
+export const DEFAULT_ARGS = [2020, 6, 6];
+
+const RealDate = Date;
+
+const isMocked = val => Boolean(val.mock);
+
+export const createFakeDateClass = ctorDefault => {
+  const FakeDate = new Proxy(RealDate, {
+    construct: (target, argArray) => {
+      const ctorArgs = argArray.length ? argArray : ctorDefault;
+
+      return new RealDate(...ctorArgs);
+    },
+    apply: (target, thisArg, argArray) => {
+      const ctorArgs = argArray.length ? argArray : ctorDefault;
+
+      return RealDate(...ctorArgs);
+    },
+    // We want to overwrite the default 'now', but only if it's not already mocked
+    get: (target, prop) => {
+      if (prop === 'now' && !isMocked(target[prop])) {
+        return () => new RealDate(...ctorDefault).getTime();
+      }
+
+      return target[prop];
+    },
+    getPrototypeOf: target => {
+      return target.prototype;
+    },
+    // We need to be able to set props so that `jest.spyOn` will work.
+    set: (target, prop, value) => {
+      // eslint-disable-next-line no-param-reassign
+      target[prop] = value;
+      return true;
+    },
+  });
+
+  return FakeDate;
+};
+
+export const useFakeDate = (...args) => {
+  const FakeDate = createFakeDateClass(args.length ? args : DEFAULT_ARGS);
+  global.Date = FakeDate;
+};
+
+export const useRealDate = () => {
+  global.Date = RealDate;
+};
diff --git a/spec/frontend/helpers/fake_date_spec.js b/spec/frontend/helpers/fake_date_spec.js
new file mode 100644
index 00000000000..8afc8225f9b
--- /dev/null
+++ b/spec/frontend/helpers/fake_date_spec.js
@@ -0,0 +1,33 @@
+import { createFakeDateClass, DEFAULT_ARGS, useRealDate } from './fake_date';
+
+describe('spec/helpers/fake_date', () => {
+  describe('createFakeDateClass', () => {
+    let FakeDate;
+
+    beforeAll(() => {
+      useRealDate();
+    });
+
+    beforeEach(() => {
+      FakeDate = createFakeDateClass(DEFAULT_ARGS);
+    });
+
+    it('should use default args', () => {
+      expect(new FakeDate()).toEqual(new Date(...DEFAULT_ARGS));
+      expect(FakeDate()).toEqual(Date(...DEFAULT_ARGS));
+    });
+
+    it('should have deterministic now()', () => {
+      expect(FakeDate.now()).not.toBe(Date.now());
+      expect(FakeDate.now()).toBe(new Date(...DEFAULT_ARGS).getTime());
+    });
+
+    it('should be instanceof Date', () => {
+      expect(new FakeDate()).toBeInstanceOf(Date);
+    });
+
+    it('should be instanceof self', () => {
+      expect(new FakeDate()).toBeInstanceOf(FakeDate);
+    });
+  });
+});
-- 
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