diff --git a/test/css/samples/global-with-unused-descendant/_config.js b/test/css/samples/global-with-unused-descendant/_config.js
new file mode 100644
index 0000000000..3ed2dd2728
--- /dev/null
+++ b/test/css/samples/global-with-unused-descendant/_config.js
@@ -0,0 +1,24 @@
+export default {
+	warnings: [{
+		code: 'css-unused-selector',
+		end: {
+			character: 27,
+			column: 19,
+			line: 2
+		},
+		frame: `
+			1: <style>
+			2:   :global(.foo) .bar {
+			     ^
+			3:     color: red;
+			4:   }
+		`,
+		message: 'Unused CSS selector',
+		pos: 9,
+		start: {
+			character: 9,
+			column: 1,
+			line: 2
+		}
+	}]
+};
diff --git a/test/css/samples/global-with-unused-descendant/expected.css b/test/css/samples/global-with-unused-descendant/expected.css
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/test/css/samples/global-with-unused-descendant/input.svelte b/test/css/samples/global-with-unused-descendant/input.svelte
new file mode 100644
index 0000000000..ede6eedec3
--- /dev/null
+++ b/test/css/samples/global-with-unused-descendant/input.svelte
@@ -0,0 +1,5 @@
+<style>
+	:global(.foo) .bar {
+		color: red;
+	}
+</style>