add testing and article

Receiving this error:

  1) Error:
DeleteArticleTest#test_Delete_article:
Capybara::Ambiguous: Ambiguous match, found 2 elements matching link or button "Destroy"
    test/features/delete_article_test.rb:8:in `block in <class:DeleteArticleTest>'

5 runs, 11 assertions, 0 failures, 1 errors, 0 skips
Deirdres-MacBook-Air:portfolio deirdreallison$ rake
Run options: --seed 41741

for test, was unable to resolve