chore: upgrade jest and add snapshot tests

Author: Naturalclar

example/__tests__/App-test.js

@@ -100,4 +100,4 @@ ProgressBarAndroidToExport.defaultProps = {
 /* $FlowFixMe(>=0.89.0 site=react_native_android_fb) This comment suppresses an
  * error found when Flow v0.89 was deployed. To see the error, delete this
  * comment and run Flow. */
-module.exports = (ProgressBarAndroidToExport: ProgressBarAndroidNativeComponent);
+export default (ProgressBarAndroidToExport: ProgressBarAndroidNativeComponent);

js/RNCProgressBarAndroid.android.js

@@ -0,0 +1,23 @@
+import * as React from 'react';
+import renderer from 'react-test-renderer';
+import ProgressBar from '../RNCProgressBarAndroid.android';
+
+describe('<ProgressBar />', () => {
+  it('renders enabled ProgressBar', () => {
+    const tree = renderer.create(<ProgressBar />).toJSON();
+
+    expect(tree).toMatchSnapshot();
+  });
+
+  it('renders Horizontal ProgressBar', () => {
+    const tree = renderer.create(<ProgressBar styleAttr="Horizontal" />).toJSON();
+
+    expect(tree).toMatchSnapshot();
+  });
+
+  it('renders Inverse ProgressBar', () => {
+    const tree = renderer.create(<ProgressBar typeAttr="Inverse" />).toJSON();
+
+    expect(tree).toMatchSnapshot();
+  });
+});

js/__tests__/RNCProgressBarAndroid.android.test.js

@@ -0,0 +1,26 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<ProgressBar /> renders Horizontal ProgressBar 1`] = `
+<AndroidProgressBar
+  animating={true}
+  indeterminate={true}
+  styleAttr="Horizontal"
+/>
+`;
+
+exports[`<ProgressBar /> renders Inverse ProgressBar 1`] = `
+<AndroidProgressBar
+  animating={true}
+  indeterminate={true}
+  styleAttr="Normal"
+  typeAttr="Inverse"
+/>
+`;
+
+exports[`<ProgressBar /> renders enabled ProgressBar 1`] = `
+<AndroidProgressBar
+  animating={true}
+  indeterminate={true}
+  styleAttr="Normal"
+/>
+`;

js/__tests__/__snapshots__/RNCProgressBarAndroid.android.test.js.snap

@@ -34,13 +34,15 @@
     "@babel/core": "^7.4.3",
     "@babel/runtime": "^7.4.3",
     "@react-native-community/eslint-config": "0.0.5",
-    "babel-jest": "^24.7.1",
+    "babel-jest": "^24.9.0",
     "babel-plugin-module-resolver": "^3.2.0",
     "eslint": "^5.16.0",
     "eslint-plugin-prettier": "^3.0.1",
-    "jest": "^24.7.1",
+    "jest": "^24.9.0",
     "metro-react-native-babel-preset": "^0.53.1",
     "prettier": "^1.17.0",
+    "react": "16.9.0",
+    "react-native": "^0.61.5",
     "react-test-renderer": "16.8.3"
   },
   "jest": {