Testing javascript on subdomain with capybara, phantomjs and rails

Question

Solution This worked. The main essence is that I have to set the `Capybara.server_port` and `Capybara.app_host` and sign in manually in the sign in form. `Capybara.app_host` cannot be set with a dynamic subdomain unless its declared in a variable. All urls has to be hard coded. ``` require 'spec_helper' feature 'customer' do let(:user) {FactoryGirl.create(:user)} let(:firm) {user.firm} let(:customers) {"http://#{firm.subdomain}.lvh.me:31234/customers"} let(:root_url) {"http://#{firm.subdomain}.lvh.me:31234/"} before(:all) do Capybara.server_port = 31234 sub = firm.subdomain Capybara.app_host = root_url end def sign_in_on_js visit root_url fill_in "Email", :with => user.email fill_in "Password", :with => "password" click_button "Sign in" page.should have_content("Signed in successfully.") end scenario "make new", js: true do sign_in_on_js visit customers page.should have_content("Add new customer") find("#dialog_customer").click page.should have_content("Create new customer") end end `…

Accepted Answer

Capybara already starts a server for you, to quote the docs:

Some Capybara drivers need to run against an actual HTTP server. Capybara takes care of this and starts one for you in the same process as your test, but on another thread. Selenium is one of those drivers, whereas RackTest is not.

Within your test you can use the `visit` method with a relative url, for example:

```
visit("/statistics")
```

Capybara will direct this request to the server it just started for this test.

When your want to use an absolute url within your test, you can, but you should also specify the port the server is running on. This port is being randomly chosen during the test. Some drivers have a method available to retrieve the port number.

For example when you use the Capybara-Webkit driver:

```
Capybara.current_session.driver.server_port
```

To `visit` an absolute url you can then use:

```
port_number = Capybara.current_session.driver.server_port
visit("http://127.0.0.1:#{port_number}/statistics")
```

Within the test specs probably a method `login_as` won't work. You have to log in with a few simple steps. For example:

```
before(:each) do
  visit "/login"
  fill_in "Email", :with => "my@email.com"
  fill_in "Password", :with => "secret"
  click_button "Login"
end
```

To test multiple subdomains you can set the `Capybara.app_host`. Take a look at this question for a detailed explanation.

UPDATE

Capybara 2 includes a nice feature called `always_include_port` which will automatically add the port number the server is running on.

```
Capybara.always_include_port = true
```

So instead of

```
visit("http://127.0.0.1:#{port_number}/statistics")
```

you can now use

```
visit("/statistics")
```

and it will automatically connect to `http://127.0.0.1:#{port_number}/statistics`.

If you want to test multiple subdomains with `Capybara.app_host`, you could use a domain name which always resolves to 127.0.0.1 for example `lvh.me`.

For example, if you specify `Capybara.app_host = "http://example.lvh.me"` it will run the tests using the `example` subdomain.

Testing javascript on subdomain with capybara, phantomjs and rails

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