1 files changed, 52 insertions, 0 deletions
diff --git a/tests/unit/webstorage_test.ts b/tests/unit/webstorage_test.ts
new file mode 100644
index 000000000..9dc560af1
--- /dev/null
+++ b/tests/unit/webstorage_test.ts
@@ -0,0 +1,52 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+// deno-lint-ignore-file no-explicit-any
+
+import { assert, assertEquals, assertThrows } from "./test_util.ts";
+
+Deno.test({ permissions: "none" }, function webStoragesReassignable() {
+  // Can reassign to web storages
+  globalThis.localStorage = 1 as any;
+  globalThis.sessionStorage = 1 as any;
+  // The actual values don't change
+  assert(globalThis.localStorage instanceof globalThis.Storage);
+  assert(globalThis.sessionStorage instanceof globalThis.Storage);
+});
+
+Deno.test(function webstorageSizeLimit() {
+  localStorage.clear();
+  assertThrows(
+    () => {
+      localStorage.setItem("k", "v".repeat(15 * 1024 * 1024));
+    },
+    Error,
+    "Exceeded maximum storage size",
+  );
+  assertEquals(localStorage.getItem("k"), null);
+  assertThrows(
+    () => {
+      localStorage.setItem("k".repeat(15 * 1024 * 1024), "v");
+    },
+    Error,
+    "Exceeded maximum storage size",
+  );
+  assertThrows(
+    () => {
+      localStorage.setItem(
+        "k".repeat(5 * 1024 * 1024),
+        "v".repeat(5 * 1024 * 1024),
+      );
+    },
+    Error,
+    "Exceeded maximum storage size",
+  );
+});
+
+Deno.test(function webstorageProxy() {
+  localStorage.clear();
+  localStorage.foo = "foo";
+  assertEquals(localStorage.foo, "foo");
+  const symbol = Symbol("bar");
+  localStorage[symbol as any] = "bar";
+  assertEquals(localStorage[symbol as any], "bar");
+  assertEquals(symbol in localStorage, true);
+});