feat: test config and first suite

__tests__/components/OrientationHOC.js

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+import 'react-native'
+import React from 'react'
+import { shallow } from 'enzyme'
+import renderer from 'react-test-renderer'
+import Enzyme from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+import OrientationHOC from '../../src/components/OrientationHOC'
+
+Enzyme.configure({ adapter: new Adapter() });
+
+describe('OrientationHOC', () => {
+  let ElementToBeWrapped = 'TestElement'
+  let Component;
+  const orientation = 'PORTRAIT'
+
+  beforeEach(() => {
+    Component = OrientationHOC(ElementToBeWrapped)
+  })
+
+  it('is function', () => {
+    expect(OrientationHOC).toBeInstanceOf(Function)
+  })
+
+  it('renders correctly', () => {
+    const tree = renderer.create(<Component />).toJSON();
+    expect(tree).toMatchSnapshot();
+  })
+
+  it('initial state', () => {
+    const component = shallow(<Component />)
+    expect(component.state()).toEqual({ orientation });
+  })
+
+  it('handleLayoutChange should set state', () => {
+    const component = shallow(<Component />)
+    component.setState({ orientation: 'LANDSCAPE' })
+    component.instance().handleLayoutChange()
+    expect(component.state('orientation')).toEqual(orientation);
+  })
+})

__tests__/components/__snapshots__/OrientationHOC.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`OrientationHOC renders correctly 1`] = `
+<View
+  onLayout={[Function]}
+  style={
+    Object {
+      "flex": 1,
+    }
+  }
+>
+  <TestElement
+    orientation="PORTRAIT"
+  />
+</View>
+`;