Add controller tests for resource-save failures

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Task

• Add non-happy-path controller tests to check that the create and update actions behave correctly when saving a limerick fails.

Steps for each controller test

• Add test:
  • test/controllers/limericks_controller_test.rb - controller test file.
  • Copy the corresponding happy-path test.
  • Rename the copy to reflect the new expectations:
    • "should not create invalid limerick" - name of new create test.
    • "should not update invalid limerick" - name of new update test.
• Arrange:
  • No change needed.
• Act:
  • Change the params to have invalid empty-string values for title and limerick_text:
    • limerick: { title: '', limerick_text: '' }
• Assert:
  • assert_no_difference - check that the number of Limerick objects in the database has not changed.
  • assert_response - check that the HTTP response has a 422 status code.
  • assert_select - check that the rendered page contains an h1 element with the appropriate text:
    • “New Limerick” for the create test.
    • “Edit Limerick” for the update test.
  • assert_not_nil - check that a flash['error'] message was set.
• Run tests and inspect coverage report:
  • rails test -v - command to run tests and generate coverage report.
  • coverage/index.html - coverage report to view in web browser.

Reference Code

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