Black-box testing

class: center, middle

# Black-box testing

### Adam Niedzielski

---
class: center

## About me

Ruby on Rails Developer @goodylabs

twitter: @niedzielskiadam

blog: adamniedzielski.github.io

---

##.center[White-box]
<img src="mysql.png" class="white-box-image"/>
<img src="rails.png" class="white-box-image"/>
<img src="solr.png" class="white-box-image"/>
---

##.center[Black-box]

---

##.center[Capybara]

```ruby
visit('/users/sign_in')

fill_in 'Login', :with => 'user@example.com'
fill_in 'Password', :with => 'password'

click_link 'Sign in'

expect(page).to have_content('Success!')

```

---

##.center[Real user]

<blockquote>
 Capybara helps you test web applications by simulating how a real user would interact with your app. [...]
 <footer>
 Capybara README
 </footer>
</blockquote>

---

##.center[Real user?]

```ruby

describe "Edit post page" do

context "when user is the creator of the post" do
    
    before do
      user = FactoryGirl.create(:user)
      login_as(user, :scope => :user)

@post = FactoryGirl.create(:post, :user => user)

visit edit_post_path(@post)
    end

it "shows previous content of the post" do
      expect(page).to have_content(@post.content)
    end
  end
end

```

---

##.center[Black-box testing Android]

```ruby

# see https://github.com/calabash/calabash-android

query("edittext index:1", :setText => "test@example.com")

wait_for(:timeout => 5) { element_exists("button marked:'Save'") }
touch("* marked:'Save'")

check_element_exists("view marked:'confirmation'")

```

---

##.center[The results]

* strong coupling
* dependent on API responses
* slooow
* fragile tests

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##.center[Lessons learned]

???

* black-box AND white-box
* mocking (in white-box)
* simple scenarios

---
name: value
##.center[When it adds value]

* all parts combined
* key business scenario

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##.center[How to black-box]

<div class = "happy-path">happy path</div>

???

* bored QA Engineer
* very, very happy path

---

class: center

## Summary

blog: adamniedzielski.github.io

twitter: @niedzielskiadam

.footnote[slides done with remark"mock the environment" image by bit.ly/1if3wQK]