add test

Author: Rich-Harris

packages/svelte/tests/css/samples/unused-ts-as-expression/_config.js

@@ -0,0 +1,20 @@
+import { test } from '../../test';
+
+export default test({
+	warnings: [
+		{
+			code: 'css_unused_selector',
+			end: {
+				character: 127,
+				column: 28,
+				line: 10
+			},
+			message: 'Unused CSS selector "[data-active=\'true\'] > span"',
+			start: {
+				character: 100,
+				column: 1,
+				line: 10
+			}
+		}
+	]
+});

packages/svelte/tests/css/samples/unused-ts-as-expression/expected.css

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+
+	/* (unused) [data-active='true'] > span {
+		background-color: red;
+	}*/

packages/svelte/tests/css/samples/unused-ts-as-expression/input.svelte

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+<script lang="ts">
+	//
+</script>
+
+<div data-active={false as true}>
+	<span></span>
+</div>
+
+<style>
+	[data-active='true'] > span {
+		background-color: red;
+	}
+</style>