Adding tests for RavenBoundary

src/components/RavenBoundary.test.js

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+import React from 'react';
+import { shallow } from 'enzyme';
+
+import RavenBoundary from './RavenBoundary';
+
+const testError = { error: 'test error' };
+const testDetails = { details: 'test details' };
+
+describe('RavenBoundary', () => {
+  test('rendering', () => {
+    const Child = () => <b>Child</b>;
+    const component = shallow(
+      <RavenBoundary>
+        <Child/>
+      </RavenBoundary>
+    );
+    expect(component).toMatchSnapshot();
+  });
+
+  test('rendering (with error)', () => {
+    const Child = () => <b>Child</b>;
+    const component = shallow(
+      <RavenBoundary>
+        <Child/>
+      </RavenBoundary>
+    );
+    expect(component).toMatchSnapshot();
+    component.instance().componentDidCatch(testError, testDetails);
+    component.update();
+    expect(component).toMatchSnapshot();
+  });
+});

src/components/__snapshots__/RavenBoundary.test.js.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`RavenBoundary rendering (with error) 1`] = `<Child />`;
+
+exports[`RavenBoundary rendering (with error) 2`] = `
+<RavenError
+  details={
+    Object {
+      "extra": Object {
+        "details": "test details",
+      },
+    }
+  }
+  error={
+    Object {
+      "error": "test error",
+    }
+  }
+  heading="An error has occurred."
+/>
+`;
+
+exports[`RavenBoundary rendering 1`] = `<Child />`;