Merge pull request #928 from middleman/capture_html-tests

capture_html helper tests

middleman-core/features/capture_html.feature

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+Feature: Support capture_html and yield_content helpers
+
+  Scenario: content_for works as expected in erb
+    Given the Server is running at "capture-html-app"
+    When I go to "/capture_html_erb.html"
+    Then I should see "In Layout: <h1>I am the yielded content erb</h1>"
+    
+  Scenario: content_for works as expected in haml
+    Given the Server is running at "capture-html-app"
+    When I go to "/capture_html_haml.html"
+    Then I should see "In Layout: <h1>I am the yielded content haml</h1>"
+    
+  Scenario: content_for works as expected in slim
+    Given the Server is running at "capture-html-app"
+    When I go to "/capture_html_slim.html"
+    Then I should see "In Layout: <h1>I am the yielded content slim</h1>"

middleman-core/fixtures/capture-html-app/config.rb

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+require "slim"
+
+with_layout :capture_html do
+  page "/capture_html_erb.html"
+  page "/capture_html_haml.html"
+  page "/capture_html_slim.html"
+end

middleman-core/fixtures/capture-html-app/source/capture_html_erb.html.erb

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+<% capture_html :from_template do %>
+  <h1>I am the yielded content erb</h1>
+<% end %>
+
+I am in the template

middleman-core/fixtures/capture-html-app/source/capture_html_haml.html.haml

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+- capture_html :from_template do
+  %h1= "I am the yielded content haml"
+
+%p I am in the template

middleman-core/fixtures/capture-html-app/source/capture_html_slim.html.slim

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+- capture_html :from_template do
+  h1 I am the yielded content slim
+
+| I am in the template

middleman-core/fixtures/capture-html-app/source/layouts/capture_html.erb

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+In Layout: <%= yield_content(:from_template) %>
+
+In Template:
+<%= yield %>