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@@ -1,4 +1,4 @@
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-%w(behaviors example_group_methods example).each { |lib| require "rspec_on_rails_on_crack/#{lib}" }
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+%w(behaviors example_group_methods example main).each { |lib| require "rspec_on_rails_on_crack/#{lib}" }
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 Spec::Runner.configuration.include RspecOnRailsOnCrack::Behaviors
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@@ -115,6 +115,17 @@ class Spec::Example::AwesomeExample < Spec::Example::Example
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     raise NotImplementedError
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   end
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+  #
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+  #   it.validates_presence_of Foo, :name
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+  #
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+  def validates_presence_of(model, *attributes)
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+    attributes.each do |attr|
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+      desc, imp = assert_validates_presence_of(model, attr)
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+      if @defined_description then create_sub_example desc, &imp
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+      else @defined_description, @implementation = desc, imp end
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+    end
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+  end
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+
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   @@variable_types.each do |collection_type, collection_op|
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     public
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     define_method "assigns_#{collection_type}" do |values|
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@@ -217,22 +228,54 @@ protected
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   # it attempts to match the mime type using Mime::Type.lookup_by_extension.
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   #
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   def render_xml(record = nil, options = {}, &block)
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+    render_xml_or_json :xml, record, options, &block
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+  end
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+
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+  # Creates 3 examples: One to check that the given JSON was returned.
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+  # It looks for two options: :status and :format.
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+  #
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+  # Checks that the json matches a given string
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+  #
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+  #   it.renders(:json) { "{}" }
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+  #
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+  # Checks that the json matches @foo.to_json
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+  #
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+  #   it.renders :json, :foo
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+  #
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+  # Checks that the json matches @foo.errors.to_json
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+  #
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+  #   it.renders :json, "foo.errors"
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+  #
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+  #   it.renders :json, :index, :status => :not_found
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+  #   it.renders :json, :index, :format => :json
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+  #
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+  # If :status is unset, it checks that that the response was a success.
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+  # Otherwise it takes an integer or a symbol and matches the status code.
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+  #
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+  # If :format is unset, it checks that the action is Mime:HTML.  Otherwise
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+  # it attempts to match the mime type using Mime::Type.lookup_by_extension.
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+  #
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+  def render_json(record = nil, options = {}, &block)
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+    render_xml_or_json :json, record, options, &block
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+  end
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+  
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+  def render_xml_or_json(format, record = nil, options = {}, &block)
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     if record.is_a?(Hash)
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       options = record
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       record  = nil
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     end
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-    @defined_description = "renders xml"
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+    @defined_description = "renders #{format}"
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     @implementation = lambda do
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       if record
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         pieces = record.to_s.split(".")
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         record = instance_variable_get("@#{pieces.shift}")
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         record = record.send(pieces.shift) until pieces.empty?
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       end
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-      block ||= lambda { record.to_xml }
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+      block ||= lambda { record.send("to_#{format}") }
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       acting.should have_text(block.call)
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     end
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     assert_status options[:status]
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-    assert_content_type options[:format] || :xml
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+    assert_content_type options[:format] || format
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   end
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   def assigns_example_values(name, value)
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@@ -277,7 +320,21 @@ protected
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       end
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     end
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   end
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-  
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+
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+  def assert_validates_presence_of(model, attribute)
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+    ["requires #{attribute}", lambda do
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+      @attributes.each do |key, value|
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+        @record.send("#{key}=", value)
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+      end
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+      old_value = @record.send(attribute)
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+      @record.send("#{attribute}=", nil)
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+      @record.should_not be_valid
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+      @record.errors.on(attribute).should_not be_nil
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+      @record.send("#{attribute}=", old_value)
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+      @record.should be_valid
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+    end]
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+  end
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+
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   def create_sub_example(desc, &imp)
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     @example_group.send(:example_objects) << Spec::Example::AwesomeExample.new(desc, @example_group, &imp) if @example_group
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   end