diff --git a/test/index.spec.ts b/test/index.spec.ts
index 3ae4118..0203044 100644
--- a/test/index.spec.ts
+++ b/test/index.spec.ts
@@ -1,4 +1,5 @@
 import TinyColor from '../src/public_api';
+import TinyColorDist from '../dist/public_api';
 
 const {
   fromRatio,
@@ -27,6 +28,12 @@ describe('TinyColor', () => {
     expect(r.toName()).toBe('red');
     expect(r).toBeTruthy();
   });
+  it('should init with function', () => {
+    const r = TinyColorDist('red');
+    expect(r).toBeInstanceOf(TinyColorDist);
+    expect(r.toName()).toBe('red');
+    expect(r).toBeTruthy();
+  });
   it('should clone', () => {
     const color1 = new TinyColor('red');
     const color2 = new TinyColor('red').clone();