diff --git a/test/sourcemaps/samples/sourcemap-basename-without-outputname/_config.js b/test/sourcemaps/samples/sourcemap-basename-without-outputname/_config.js
new file mode 100644
index 0000000000..d9004f7e58
--- /dev/null
+++ b/test/sourcemaps/samples/sourcemap-basename-without-outputname/_config.js
@@ -0,0 +1,18 @@
+export const component_filepath = 'src/some/deep/path/input.svelte';
+
+export const component_file_basename = 'input.svelte';
+
+export default {
+
+	js_map_sources: [component_file_basename],
+
+	options: {
+		filename: component_filepath
+	},
+	compile_options: {
+		filename: component_filepath,
+		// ../../index.ts initializes output filenames, reset to undefined for this test
+		outputFilename: undefined,
+		cssOutputFilename: undefined
+	}
+};
diff --git a/test/sourcemaps/samples/sourcemap-basename-without-outputname/input.svelte b/test/sourcemaps/samples/sourcemap-basename-without-outputname/input.svelte
new file mode 100644
index 0000000000..4548af5548
--- /dev/null
+++ b/test/sourcemaps/samples/sourcemap-basename-without-outputname/input.svelte
@@ -0,0 +1 @@
+<h1>sourcemap-basename-without-outputname</h1>
diff --git a/test/sourcemaps/samples/sourcemap-basename-without-outputname/test.js b/test/sourcemaps/samples/sourcemap-basename-without-outputname/test.js
new file mode 100644
index 0000000000..c5747713a7
--- /dev/null
+++ b/test/sourcemaps/samples/sourcemap-basename-without-outputname/test.js
@@ -0,0 +1,3 @@
+// no additional test needed, _config.js values and the js.map.sources assertion in ../../index.ts cover it
+export function test() {}
+