Components: Add tests for <PostStatus /> component

[aduth]

The <PostStatus /> component (block) is currently not tested. We should seek to add tests to verify expected render behavior of the component. Enzyme (and chai-enzyme assertions) may be useful utilities for rendering and asserting expected render results. Ideas for test cases may include some or all of the following:

• Render returns expected element
  • Optionally rendered components are or are not present
  • Modifier classes by incoming props or component state
• User interactions have expected results
• Impact of lifecycle methods when props or state change during lifetime of component

When submitting a pull request, reference this issue.