Cleaned up e2e tests out of unused imports etc.

Summary:
## Motivation (required)

I've noticed that there were some unused import statements in e2e tests and some minor code quality issues (like unintended `if` statement in `jest/prepareE2E.js`), this PR addresses that.

## Test Plan (required)

`npm run tests` passes just fine
Closes #126

Reviewed By: mikearmstrong001

Differential Revision: D4957532

Pulled By: mikearmstrong001

fbshipit-source-id: 84bb031

EndToEnd/runner/MockWorker.js

@@ -7,8 +7,6 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  */
 
-import fs from 'fs';
-import path from 'path';
 import vm from 'vm';
 import {_getObjectFromURL} from './MockURL';
 

EndToEnd/testapp/client.js

@@ -4,8 +4,7 @@ function init(bundle, parent, options) {
   const vr = new VRInstance(bundle, 'End2End', parent, {
     ...options,
   });
-  vr.render = function() {
-  };
+  vr.render = function() {};
   // Begin the animation loop
   vr.start();
   window.vr = vr;

EndToEnd/testapp/e2e.vr.js

@@ -1,14 +1,7 @@
 'use strict';
 
 import React from 'react';
-import {
-  AppRegistry,
-  asset,
-  NativeModules,
-  Pano,
-  Text,
-  View,
-} from 'react-vr';
+import {AppRegistry, NativeModules, Text, View} from 'react-vr';
 
 window.NativeModules = NativeModules;
 
@@ -32,6 +25,6 @@ class End2End extends React.Component {
       </View>
     );
   }
-};
+}
 
 AppRegistry.registerComponent('End2End', () => End2End);

jest/prepareE2E.js

@@ -8,84 +8,82 @@ console.log('Running full test suite.');
 console.log('If you want to skip the end-to-end tests, run `npm run test-unit`\n');
 
 if (!process.env.SKIPBUILD) {
+  console.log('Building React VR apps for end-to-end testing.');
+  console.log('If you don\'t want to do this for every test run, set SKIPBUILD=1.');
+  console.log('  SKIPBUILD=1 npm test');
 
-console.log('Building React VR apps for end-to-end testing.');
-console.log('If you don\'t want to do this for every test run, set SKIPBUILD=1.');
-console.log('  SKIPBUILD=1 npm test');
+  function buildScript(root, input, output) {
+    const cliLocation = require.resolve('react-native/local-cli/cli.js');
+    const configLocation = path.resolve(root, 'rn-cli.config.js');
+    return new Promise(function(resolve, reject) {
+      const npm = child_process.spawn(
+          (/^win/.test(process.platform) ? 'node.exe' : 'node'),
+          [
+            cliLocation,
+            'bundle',
+            '--entry-file',
+            input,
+            '--platform',
+            'vr',
+            '--bundle-output',
+            output,
+            '--dev',
+            'false',
+            '--config',
+            configLocation,
+            '--reset-cache'
+          ],
+          {stdio: 'inherit', cwd: root}
+      );
+      npm.on('close', function(code) {
+        if (code !== 0) {
+          reject(code);
+        }
+        resolve();
+      });
+    });
+  }
 
-function buildScript(root, input, output) {
-  const cliLocation = require.resolve('react-native/local-cli/cli.js');
-  const configLocation = path.resolve(root, 'rn-cli.config.js');
-  return new Promise(function(resolve, reject) {
-    const npm = child_process.spawn(
-      (/^win/.test(process.platform) ? 'node.exe' : 'node'),
-      [
-        cliLocation,
-        'bundle',
-        '--entry-file',
-        input,
-        '--platform',
-        'vr',
-        '--bundle-output',
-        output,
-        '--dev',
-        'false',
-        '--config',
-        configLocation,
-        '--reset-cache'
-      ],
-      {stdio: 'inherit', cwd: root}
-    );
-    npm.on('close', function(code) {
-      if (code !== 0) {
-        reject(code);
+  const rootDir = path.resolve(__dirname, '..', 'EndToEnd', 'testapp');
+
+  new Promise(function(resolve, reject) {
+    const buildDir = path.join(rootDir, 'build');
+    try {
+      const stat = fs.statSync(buildDir);
+      if (stat.isDirectory()) {
+        return resolve();
+      }
+    } catch (e) {}
+    fs.mkdir(path.join(rootDir, 'build'), function(err) {
+      if (err) {
+        console.log('Failed to create `testapp/build` directory');
+        return reject(1);
       }
       resolve();
     });
+  }).then(function() {
+    return Promise.all([
+      buildScript(
+          rootDir,
+          path.resolve(rootDir, 'e2e.vr.js'),
+          path.resolve(rootDir, 'build', 'e2e.bundle.js')
+      ),
+      buildScript(
+          rootDir,
+          path.resolve(rootDir, 'client.js'),
+          path.resolve(rootDir, 'build', 'client.bundle.js')
+      ),
+    ]);
+  }).then(function() {
+    console.log(
+        'Production versions were successfully built.' +
+        'They can be found at ' + path.resolve(rootDir, 'build')
+    );
+  }).catch(function(err) {
+    console.log(
+        'An error occurred during the bundling process. Exited with code ' + err +
+        '.\nLook at the packager output above to see what went wrong.'
+    );
+    process.exit(1);
   });
-}
-
-const rootDir = path.resolve(__dirname, '..', 'EndToEnd', 'testapp');
-
-new Promise(function(resolve, reject) {
-  const buildDir = path.join(rootDir, 'build');
-  try {
-    const stat = fs.statSync(buildDir);
-    if (stat.isDirectory()) {
-      return resolve();
-    }
-  } catch (e) {}
-  fs.mkdir(path.join(rootDir, 'build'), function(err) {
-    if (err) {
-      console.log('Failed to create `testapp/build` directory');
-      return reject(1);
-    }
-    resolve();
-  });
-}).then(function() {
-  return Promise.all([
-    buildScript(
-      rootDir,
-      path.resolve(rootDir, 'e2e.vr.js'),
-      path.resolve(rootDir, 'build', 'e2e.bundle.js')
-    ),
-    buildScript(
-      rootDir,
-      path.resolve(rootDir, 'client.js'),
-      path.resolve(rootDir, 'build', 'client.bundle.js')
-    ),
-  ]);
-}).then(function() {
-  console.log(
-    'Production versions were successfully built.' +
-    'They can be found at ' + path.resolve(rootDir, 'build')
-  );
-}).catch(function(err) {
-  console.log(
-    'An error occurred during the bundling process. Exited with code ' + err +
-    '.\nLook at the packager output above to see what went wrong.'
-  );
-  process.exit(1);
-});
-
-}
+}