diff --git a/test/sourcemaps/index.ts b/test/sourcemaps/index.ts
index 903629c06b..fc021cd6a7 100644
--- a/test/sourcemaps/index.ts
+++ b/test/sourcemaps/index.ts
@@ -85,11 +85,13 @@ describe('sourcemaps', () => {
 				);
 			}
 
-			assert.deepEqual(
-				js.map.sources.slice().sort(),
-				(config.js_map_sources || ['input.svelte']).sort(),
-				'js.map.sources is wrong'
-			);
+			if (js.map) {
+				assert.deepEqual(
+					js.map.sources.slice().sort(),
+					(config.js_map_sources || ['input.svelte']).sort(),
+					'js.map.sources is wrong'
+				);
+			}
 			if (css.map) {
 				assert.deepEqual(
 					css.map.sources.slice().sort(),
diff --git a/test/sourcemaps/samples/no-sourcemap/_config.js b/test/sourcemaps/samples/no-sourcemap/_config.js
new file mode 100644
index 0000000000..5b84d40554
--- /dev/null
+++ b/test/sourcemaps/samples/no-sourcemap/_config.js
@@ -0,0 +1,5 @@
+export default {
+  compile_options: {
+    enableSourcemap: false
+  }
+};
diff --git a/test/sourcemaps/samples/no-sourcemap/input.svelte b/test/sourcemaps/samples/no-sourcemap/input.svelte
new file mode 100644
index 0000000000..91a483c9aa
--- /dev/null
+++ b/test/sourcemaps/samples/no-sourcemap/input.svelte
@@ -0,0 +1,11 @@
+<script>
+	export let foo;
+</script>
+
+<p>{foo}</p>
+
+<style>
+	p {
+		color: red;
+	}
+</style>
\ No newline at end of file
diff --git a/test/sourcemaps/samples/no-sourcemap/test.js b/test/sourcemaps/samples/no-sourcemap/test.js
new file mode 100644
index 0000000000..127459a54e
--- /dev/null
+++ b/test/sourcemaps/samples/no-sourcemap/test.js
@@ -0,0 +1,4 @@
+export function test({ assert, js, css }) {
+	assert.equal(js.map, null);
+	assert.equal(css.map, null);
+}
diff --git a/test/sourcemaps/samples/only-css-sourcemap/_config.js b/test/sourcemaps/samples/only-css-sourcemap/_config.js
new file mode 100644
index 0000000000..011ea33f91
--- /dev/null
+++ b/test/sourcemaps/samples/only-css-sourcemap/_config.js
@@ -0,0 +1,5 @@
+export default {
+  compile_options: {
+    enableSourcemap: 'css'
+  }
+};
diff --git a/test/sourcemaps/samples/only-css-sourcemap/input.svelte b/test/sourcemaps/samples/only-css-sourcemap/input.svelte
new file mode 100644
index 0000000000..91a483c9aa
--- /dev/null
+++ b/test/sourcemaps/samples/only-css-sourcemap/input.svelte
@@ -0,0 +1,11 @@
+<script>
+	export let foo;
+</script>
+
+<p>{foo}</p>
+
+<style>
+	p {
+		color: red;
+	}
+</style>
\ No newline at end of file
diff --git a/test/sourcemaps/samples/only-css-sourcemap/test.js b/test/sourcemaps/samples/only-css-sourcemap/test.js
new file mode 100644
index 0000000000..a7ac6a9b0b
--- /dev/null
+++ b/test/sourcemaps/samples/only-css-sourcemap/test.js
@@ -0,0 +1,4 @@
+export function test({ assert, js, css }) {
+	assert.equal(js.map, null);
+	assert.notEqual(css.map, null);
+}
diff --git a/test/sourcemaps/samples/only-js-sourcemap/_config.js b/test/sourcemaps/samples/only-js-sourcemap/_config.js
new file mode 100644
index 0000000000..9a5bd733a1
--- /dev/null
+++ b/test/sourcemaps/samples/only-js-sourcemap/_config.js
@@ -0,0 +1,5 @@
+export default {
+  compile_options: {
+    enableSourcemap: 'js'
+  }
+};
diff --git a/test/sourcemaps/samples/only-js-sourcemap/input.svelte b/test/sourcemaps/samples/only-js-sourcemap/input.svelte
new file mode 100644
index 0000000000..91a483c9aa
--- /dev/null
+++ b/test/sourcemaps/samples/only-js-sourcemap/input.svelte
@@ -0,0 +1,11 @@
+<script>
+	export let foo;
+</script>
+
+<p>{foo}</p>
+
+<style>
+	p {
+		color: red;
+	}
+</style>
\ No newline at end of file
diff --git a/test/sourcemaps/samples/only-js-sourcemap/test.js b/test/sourcemaps/samples/only-js-sourcemap/test.js
new file mode 100644
index 0000000000..b150653c3d
--- /dev/null
+++ b/test/sourcemaps/samples/only-js-sourcemap/test.js
@@ -0,0 +1,4 @@
+export function test({ assert, js, css }) {
+	assert.notEqual(js.map, null);
+	assert.equal(css.map, null);
+}