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<!DOCTYPE html>
<meta charset="utf-8">
<title>KV Storage: undefined values</title>
<!-- https://github.com/wicg/kv-storage/commit/5bf31109f37d1371f619ea33d0e2391f10e8b8f5 -->
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script type="module">
import { StorageArea } from "std:kv-storage";
import { testWithArea } from "./helpers/kvs-tests.js";
import { assertAsyncIteratorEquals } from "./helpers/equality-asserters.js";
testWithArea(async (area) => {
assert_equals(await area.get("key"), undefined);
}, "Get on a non-existant key returns undefined");
testWithArea(async (area) => {
await area.set("key", undefined);
assert_equals(await area.get("key"), undefined);
await assertAsyncIteratorEquals(area.keys(), [], "keys");
await assertAsyncIteratorEquals(area.values(), [], "values");
await assertAsyncIteratorEquals(area.entries(), [], "entries");
}, "Setting undefined as a value when nothing was present is a no-op");
testWithArea(async (area) => {
await area.set("key", "value");
await area.set("key", undefined);
assert_equals(await area.get("key"), undefined);
await assertAsyncIteratorEquals(area.keys(), [], "keys");
await assertAsyncIteratorEquals(area.values(), [], "values");
await assertAsyncIteratorEquals(area.entries(), [], "entries");
}, "Setting undefined as a value deletes what was previously there");
</script>
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