chore(datetime): use FakeTime for testing parse (#2109)

.github/workflows/ci.yml

@@ -28,18 +28,9 @@ jobs:
         with:
           deno-version: ${{ matrix.deno }}
 
-      - name: Install fakedate
-        if: matrix.os == 'ubuntu-latest'
-        run: |
-          sudo apt install faketime
-
       - name: Run tests canary
         run: deno task test
 
-      - name: Run test with the date 2021-12-31
-        if: matrix.os == 'ubuntu-latest'
-        run: deno task test:faketime
-
       - name: Type check browser compatible modules
         shell: bash
         run: deno task test:browser

datetime/test.ts

@@ -1,5 +1,6 @@
 // Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
 import { assert, assertEquals, assertThrows } from "../testing/asserts.ts";
+import { FakeTime } from "../testing/time.ts";
 import * as datetime from "./mod.ts";
 
 Deno.test({
@@ -64,6 +65,75 @@ Deno.test({
   },
 });
 
+Deno.test("[std/datetime] parse: The date is 2021-12-31", () => {
+  const time = new FakeTime("2021-12-31");
+  try {
+    assertEquals(
+      datetime.parse("01-01", "MM-dd"),
+      new Date(2021, 0, 1),
+    );
+    assertEquals(
+      datetime.parse("02-01", "MM-dd"),
+      new Date(2021, 1, 1),
+    );
+    assertEquals(
+      datetime.parse("03-01", "MM-dd"),
+      new Date(2021, 2, 1),
+    );
+    assertEquals(
+      datetime.parse("04-01", "MM-dd"),
+      new Date(2021, 3, 1),
+    );
+    assertEquals(
+      datetime.parse("05-01", "MM-dd"),
+      new Date(2021, 4, 1),
+    );
+    assertEquals(
+      datetime.parse("06-01", "MM-dd"),
+      new Date(2021, 5, 1),
+    );
+    assertEquals(
+      datetime.parse("07-01", "MM-dd"),
+      new Date(2021, 6, 1),
+    );
+    assertEquals(
+      datetime.parse("08-01", "MM-dd"),
+      new Date(2021, 7, 1),
+    );
+    assertEquals(
+      datetime.parse("09-01", "MM-dd"),
+      new Date(2021, 8, 1),
+    );
+    assertEquals(
+      datetime.parse("10-01", "MM-dd"),
+      new Date(2021, 9, 1),
+    );
+    assertEquals(
+      datetime.parse("11-01", "MM-dd"),
+      new Date(2021, 10, 1),
+    );
+    assertEquals(
+      datetime.parse("12-01", "MM-dd"),
+      new Date(2021, 11, 1),
+    );
+
+    assertEquals(
+      datetime.parse("01", "dd"),
+      new Date(2021, 11, 1),
+    );
+    assertEquals(
+      datetime.parse("15", "dd"),
+      new Date(2021, 11, 15),
+    );
+    assertEquals(
+      datetime.parse("31", "dd"),
+      new Date(2021, 11, 31),
+    );
+  } finally {
+    time.restore();
+  }
+});
+
 Deno.test({
   name: "[std/datetime] invalidParseDateTimeFormatThrows",
   fn: () => {

datetime/test_2021_12_31.ts

@@ -1,61 +0,0 @@
-// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
-// This file contains test cases which needs to be run at the specific date (2021-12-31)
-import { assertEquals } from "../testing/asserts.ts";
-import { parse } from "./mod.ts";
-
-Deno.test("The date is 2021-12-31", () => {
-  const d = new Date();
-  d.setHours(0, 0, 0, 0);
-  assertEquals(d, new Date(2021, 11, 31));
-});
-
-Deno.test("[std/datetime] parse: The date is 2021-12-31", () => {
-  assertEquals(
-    parse("01-01", "MM-dd"),
-    new Date(2021, 0, 1),
-  );
-  assertEquals(
-    parse("02-01", "MM-dd"),
-    new Date(2021, 1, 1),
-  );
-  assertEquals(
-    parse("03-01", "MM-dd"),
-    new Date(2021, 2, 1),
-  );
-  assertEquals(
-    parse("04-01", "MM-dd"),
-    new Date(2021, 3, 1),
-  );
-  assertEquals(
-    parse("05-01", "MM-dd"),
-    new Date(2021, 4, 1),
-  );
-  assertEquals(
-    parse("06-01", "MM-dd"),
-    new Date(2021, 5, 1),
-  );
-  assertEquals(
-    parse("07-01", "MM-dd"),
-    new Date(2021, 6, 1),
-  );
-  assertEquals(
-    parse("08-01", "MM-dd"),
-    new Date(2021, 7, 1),
-  );
-  assertEquals(
-    parse("09-01", "MM-dd"),
-    new Date(2021, 8, 1),
-  );
-  assertEquals(
-    parse("10-01", "MM-dd"),
-    new Date(2021, 9, 1),
-  );
-  assertEquals(
-    parse("11-01", "MM-dd"),
-    new Date(2021, 10, 1),
-  );
-  assertEquals(
-    parse("12-01", "MM-dd"),
-    new Date(2021, 11, 1),
-  );
-});

deno.json

@@ -35,7 +35,6 @@
   },
   "tasks": {
     "test": "deno test --doc --unstable --allow-all --coverage=./cov --ignore=node/",
-    "test:faketime": "faketime '2021-12-31' deno test --unstable --allow-all datetime/test_2021_12_31.ts",
     "test:browser": "git grep --name-only \"// This module is browser compatible.\" | grep -v \".github/workflows\" | xargs deno cache --config browser-compat.tsconfig.json",
     "node:unit": "DENO_FUTURE_CHECK=1 deno test --unstable --allow-all node/ --ignore=node/_tools/test.ts,node/_tools/versions/",
     "node:test": "deno test --unstable --allow-all node/_tools/test.ts",