mode function to utils file and add test

Author: ipatate

.babelrc

@@ -12,12 +12,14 @@
       }
     ]
   ],
-  "plugins": ["transform-class-properties", "external-helpers"],
+  "plugins": ["transform-class-properties"],
   "env": {
     "test": {
       "plugins": ["transform-es2015-modules-commonjs"]
     },
-    "development": {},
+    "development": {
+      "plugins": ["external-helpers"]
+    },
     "production": {}
   }
 }

__tests__/__snapshots__/getScrollPage.spec.js.snap

@@ -0,0 +1,3 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`get scroll 10 value 1`] = `10`;

__tests__/__snapshots__/saveUrl.spec.js.snap

@@ -0,0 +1,32 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`3 url insert 1`] = `
+Array [
+  Object {
+    "pathname": "/bar",
+    "scroll": 0,
+  },
+  Object {
+    "pathname": "/foo",
+    "scroll": 0,
+  },
+]
+`;
+
+exports[`no array in first param 1`] = `
+Array [
+  Object {
+    "pathname": "/",
+    "scroll": 0,
+  },
+]
+`;
+
+exports[`only 2 params 1`] = `
+Array [
+  Object {
+    "pathname": "/",
+    "scroll": 0,
+  },
+]
+`;

__tests__/getScrollPage.spec.js

@@ -0,0 +1,7 @@
+import { getScrollPage } from '../src/utils/utils';
+
+test('get scroll 10 value', () => {
+  Object.defineProperty(window, 'pageYOffset', { value: 10, writable: true });
+  const r = getScrollPage();
+  expect(r).toMatchSnapshot();
+});

__tests__/saveUrl.spec.js

@@ -0,0 +1,19 @@
+import { saveUrl } from '../src/utils/utils';
+
+test('no array in first param', () => {
+  const r = saveUrl('lol', '/', 0);
+  expect(r).toMatchSnapshot();
+});
+
+test('only 2 params', () => {
+  const r = saveUrl('lol', '/');
+  expect(r).toMatchSnapshot();
+});
+
+test('3 url insert', () => {
+  let url = [];
+  url = saveUrl(url, '/');
+  url = saveUrl(url, '/foo');
+  url = saveUrl(url, '/bar');
+  expect(url).toMatchSnapshot();
+});

__tests__/scrollTo.spec.js

@@ -0,0 +1,10 @@
+import { scrollTo } from '../src/utils/utils';
+
+test('scrollTo 100', () => {
+  global.scrollTo = jest.fn();
+  global.requestAnimationFrame = jest.fn(cb => {
+    cb();
+  });
+  scrollTo(100);
+  expect(global.scrollTo).toHaveBeenCalledWith(0, 100);
+});