diff --git a/test/runtime/__snapshots__/api.test.js.snap b/test/runtime/__snapshots__/api.test.js.snap
index 23ba2486..3304a234 100644
--- a/test/runtime/__snapshots__/api.test.js.snap
+++ b/test/runtime/__snapshots__/api.test.js.snap
@@ -2,6 +2,10 @@
 
 exports[`api should import modules 1`] = `"body { b: 2; }body { c: 3; }body { b: 2; }@media print {body { b: 2; }}@media print {body { d: 4; }}@media screen and (orientation:landscape) {body { a: 1; }}@media (orientation:landscape) {body { a: 1; }}"`;
 
+exports[`api should import modules when module string 1`] = `".button { b: 2; }"`;
+
+exports[`api should import modules with dedupe 1`] = `"body { b: 1; }body { b: 2; }.button { b: 3; }"`;
+
 exports[`api should import named modules 1`] = `"body { b: 2; }body { c: 3; }body { b: 2; }@media print {body { b: 2; }}@media print {body { d: 4; }}@media screen {body { a: 1; }}"`;
 
 exports[`api should toString a single module 1`] = `"body { a: 1; }"`;
diff --git a/test/runtime/api.test.js b/test/runtime/api.test.js
index ced44a64..f945c4b2 100644
--- a/test/runtime/api.test.js
+++ b/test/runtime/api.test.js
@@ -137,4 +137,30 @@ describe('api', () => {
 
     expect(m.toString()).toMatchSnapshot();
   });
+
+  it('should import modules with dedupe', () => {
+    const m = api();
+
+    const m1 = [null, 'body { b: 1; }', ''];
+    const m2 = ['./module2', 'body { b: 2; }', ''];
+    const m3 = ['./module3', '.button { b: 3; }', ''];
+
+    m.i([m1], '', true);
+    m.i([m2], '', true);
+    m.i([m3], '', true);
+    m.i([m3], '', true);
+    m.i([m3], '', true);
+
+    expect(m.toString()).toMatchSnapshot();
+    expect(m.length).toBe(3);
+  });
+
+  it('should import modules when module string', () => {
+    const m = api();
+
+    m.i('.button { b: 2; }');
+    m.i('');
+
+    expect(m.toString()).toMatchSnapshot();
+  });
 });