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Instalação: https://docs.mongodb.org/manual/tutorial/install-mongodb-on-windows/

Teste:

$ mongo --port 27017 --host localhost
MongoDB shell version: 2.6.6
connecting to: test

Acessar mongo shell:

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Capybara

save_and_open_page

Matchers

have_button(locator)

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=Navigating=
    visit('/projects')
    visit(post_comments_path(post))

=Clicking links and buttons=
    click_link('id-of-link')
    click_link('Link Text')
    click_button('Save')
    click('Link Text') # Click either a link or a button
    click('Button Value')

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# Model

expect(@user).to have(1).error_on(:username) # checks whether there is an error in username
expect(@user.errors[:username]).to include("can't be blank") # check for the error message

# Rendering

expect(response).to render_template(:index)

# Redirecting