2 files changed, 40 insertions, 0 deletions
diff --git a/std/uuid/tests/v4/generate.ts b/std/uuid/tests/v4/generate.ts
new file mode 100644
index 000000000..829183d97
--- /dev/null
+++ b/std/uuid/tests/v4/generate.ts
@@ -0,0 +1,23 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { assert, assertEquals } from "../../../testing/asserts.ts";
+import { test } from "../../../testing/mod.ts";
+import generate, { validate } from "../../v4.ts";
+
+test({
+  name: "[UUID] test_uuid_v4",
+  fn(): void {
+    const u = generate();
+    assertEquals(typeof u, "string", "returns a string");
+    assert(u !== "", "return string is not empty");
+  }
+});
+
+test({
+  name: "[UUID] test_uuid_v4_format",
+  fn(): void {
+    for (let i = 0; i < 10000; i++) {
+      const u = generate() as string;
+      assert(validate(u), `${u} is not a valid uuid v4`);
+    }
+  }
+});
diff --git a/std/uuid/tests/v4/validate.ts b/std/uuid/tests/v4/validate.ts
new file mode 100644
index 000000000..fdec8383a
--- /dev/null
+++ b/std/uuid/tests/v4/validate.ts
@@ -0,0 +1,17 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import { assert } from "../../../testing/asserts.ts";
+import { test } from "../../../testing/mod.ts";
+import generate, { validate } from "../../v4.ts";
+
+test({
+  name: "[UUID] is_valid_uuid_v4",
+  fn(): void {
+    const u = generate();
+    const t = "84fb7824-b951-490e-8afd-0c13228a8282";
+    const n = "84fb7824-b951-490g-8afd-0c13228a8282";
+
+    assert(validate(u), `generated ${u} should be valid`);
+    assert(validate(t), `${t} should be valid`);
+    assert(!validate(n), `${n} should not be valid`);
+  }
+});