test: Children.map/forEach/only/toArray

packages/nerv/__tests__/children.spec.js

@@ -0,0 +1,67 @@
+import { Children } from '../src/children'
+
+describe('Children', () => {
+  describe('map', () => {
+    it('should return itself when is undefined', () => {
+      expect(Children.map()).toBe(undefined)
+    })
+    it('should bind the ctx', () => {
+      const children = ['1', '2', '3']
+      function times2 (n) {
+        return n * 2
+      }
+      expect(Children.map(children, times2, Number)).toEqual([2, 4, 6])
+    })
+    it('should exec map with every element', () => {
+      const children = [1, 2, 3]
+      function times2 (n) {
+        return n * 2
+      }
+      expect(Children.map(children, times2)).toEqual([2, 4, 6])
+    })
+  })
+
+  describe('forEach', () => {
+    it('should return itself when is undefined', () => {
+      expect(Children.forEach()).toBe(undefined)
+    })
+
+    it('should exec with every element', () => {
+      const children = [1, 2, 3]
+      function times2 (n, i) {
+        children[i] = n * 2
+      }
+      Children.forEach(children, times2)
+      expect(children).toEqual([2, 4, 6])
+    })
+
+    it('should bind the ctx', () => {
+      const children = ['1', '2', '3']
+      function times2 (n, i) {
+        children[i] = n * 2
+      }
+      Children.forEach(children, times2, Number)
+      expect(children).toEqual([2, 4, 6])
+    })
+  })
+
+  it('should return the only one children in a array', () => {
+    expect(Children.only(['wallace'])).toBe('wallace')
+  })
+
+  it('should throw error when input childrens', () => {
+    expect(() => {
+      Children.only([1, 2])
+    }).toThrowError(`Children.only() expects only one child.`)
+  })
+
+  it('count should work', () => {
+    expect(Children.count([])).toBe(0)
+  })
+
+  describe('toArray', () => {
+    it('should return empty array when undefined', () => {
+      expect(Children.toArray().length).toBe(0)
+    })
+  })
+})