add some test

test.js

@@ -48,7 +48,7 @@ test('Events', (t) => {
 })
 
 test('Value Interpolation', (t) => {
-  let obj = { a: 0, b: 'B value 1', c: { x: 2 }, d: [3], _e: 4, g: 5, h: 0, j: 0, k: '#000' }
+  let obj = { a: 0, b: 'B value 1', c: { x: 2 }, d: [3], _e: 4, g: 5, h: 0, j: 0, k: '#000', l: '#0cf', m: '#fc0' }
 
   Object.defineProperty(obj, 'e', {
     get () {
@@ -70,7 +70,9 @@ test('Value Interpolation', (t) => {
         g: '+=1',
         h: 250000,
         j: [1, 2],
-        k: ['rgb(100, 100, 100)', 'rgb(200, 200, 200)']
+        k: ['rgb(100, 100, 100)', 'rgb(200, 200, 200)'],
+        l: '#fc0',
+        m: '#0cf'
       },
       100
     )
@@ -87,6 +89,8 @@ test('Value Interpolation', (t) => {
   t.is(obj.h, 0)
   t.is(obj.j, 0)
   t.is(obj.k, 'rgb(0, 0, 0)')
+  t.is(obj.l, 'rgb(0, 204, 255)')
+  t.is(obj.m, 'rgb(255, 204, 0)')
 
   update(50)
 
@@ -128,6 +132,8 @@ test('Value Interpolation', (t) => {
   t.is(obj.h, 250000, 'Big number interpolation ending value not worked as excepted')
   t.is(obj.j, 2, 'Multi-Interpolation not worked as excepted')
   t.is(obj.k, 'rgb(200, 200, 200)', 'Multi-Interpolation not worked as excepted')
+  t.is(obj.l, 'rgb(255, 204, 0)', 'String interpolation not worked as excepted')
+  t.is(obj.m, 'rgb(0, 204, 255)', 'String interpolation not worked as excepted')
 })
 
 test('Value Array-based Interpolation', (t) => {