1 files changed, 24 insertions, 0 deletions
diff --git a/std/_util/deep_assign_test.ts b/std/_util/deep_assign_test.ts
new file mode 100644
index 000000000..f1a56e1ad
--- /dev/null
+++ b/std/_util/deep_assign_test.ts
@@ -0,0 +1,24 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+const { test } = Deno;
+import { assertEquals, assert } from "../testing/asserts.ts";
+import { deepAssign } from "./deep_assign.ts";
+
+test("deepAssignTest", function (): void {
+  const date = new Date("1979-05-27T07:32:00Z");
+  const reg = RegExp(/DENOWOWO/);
+  const obj1 = { deno: { bar: { deno: ["is", "not", "node"] } } };
+  const obj2 = { foo: { deno: date } };
+  const obj3 = { foo: { bar: "deno" }, reg: reg };
+  const actual = deepAssign(obj1, obj2, obj3);
+  const expected = {
+    foo: {
+      deno: new Date("1979-05-27T07:32:00Z"),
+      bar: "deno",
+    },
+    deno: { bar: { deno: ["is", "not", "node"] } },
+    reg: RegExp(/DENOWOWO/),
+  };
+  assert(date !== expected.foo.deno);
+  assert(reg !== expected.reg);
+  assertEquals(actual, expected);
+});