Merge pull request #14 from oslabs-beta/rydang/jest-timejump

test for timeJump.js

Author: mylee1995

.gitignore

@@ -3,3 +3,4 @@ node_modules
 dist/
 extension/bundle.js
 package/react-time-travel-1.0.1.tgz
+tictactoe

__tests__/index.test.js package/__tests__/index.test.js__tests__/index.test.js renamed to package/__tests__/index.test.js

@@ -1,6 +1,6 @@
-const index = require('../package/index');
+const index = require('../index');
 
-jest.mock('../package/timeJump');
+jest.mock('../timeJump');
 
 describe('unit testing for index.js', () => {
   test('index.js should be exporting the linkState and timeJump methods', () => {

package/__tests__/timeJump.test.js

@@ -0,0 +1,56 @@
+const timeJumpExport = require('../timeJump');
+
+describe('unit testing for timeJump.js', () => {
+  let timeJump;
+  let snapShot;
+  let mode;
+  let mockFuncs;
+  const count = 3;
+
+  beforeEach(() => {
+    snapShot = [];
+    mode = { jumping: false };
+    mockFuncs = [];
+    timeJump = timeJumpExport(snapShot, mode);
+
+    const createSetStateAsync = (i) => {
+      return (state) => {
+        return new Promise((resolve) => {
+          mockFuncs[i](state);
+          resolve();
+        });
+      };
+    };
+
+    for (let i = 0; i < count; i += 1) {
+      mockFuncs.push(jest.fn());
+      snapShot.push({ setStateAsync: createSetStateAsync(i) });
+    }
+  });
+
+  test('calling the initial require should return a function', () => {
+    expect(typeof timeJump).toBe('function');
+  });
+
+  test('timeJump should iterate through snapshot and call setStateAsync on each state', () => {
+    const calls = 10;
+    for (let i = 1; i <= calls; i += 1) {
+      timeJump(Array(count).fill('test'));
+      mockFuncs.forEach(mockFunc => expect(mockFunc.mock.calls.length).toBe(i));
+    }
+  });
+  test('timeJump should pass the state from new snapshot to setStateAsync', () => {
+    const newSnapShot = [];
+    for (let i = 0; i < count; i += 1) {
+      newSnapShot.push(`testState${i}`);
+    }
+    timeJump(newSnapShot);
+    mockFuncs.forEach((mockFunc, i) => expect(mockFunc.mock.calls[0][0]).toBe(`testState${i}`));
+
+    for (let i = 0; i < count; i += 1) {
+      newSnapShot[i] = { testkey: `testval${i}` };
+    }
+    timeJump(newSnapShot);
+    mockFuncs.forEach((mockFunc, i) => expect(mockFunc.mock.calls[1][0]).toEqual({ testkey: `testval${i}` }));
+  });
+});