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--- a/spec/backends/swiftiply_client_spec.rb
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+++ b/spec/backends/swiftiply_client_spec.rb
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@@ -3,7 +3,7 @@
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 describe Backends::SwiftiplyClient do
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   before do
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     @backend = Backends::SwiftiplyClient.new('0.0.0.0', 3333)
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-    @backend.server = mock('server', :null_object => true)
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+    @backend.server = mock('server').as_null_object
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   end
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   it "should connect" do
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@@ -26,7 +26,7 @@
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   before do
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     @connection = SwiftiplyConnection.new(nil)
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     @connection.backend = Backends::SwiftiplyClient.new('0.0.0.0', 3333)
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-    @connection.backend.server = mock('server', :null_object => true)
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+    @connection.backend.server = mock('server').as_null_object
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   end
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   it do
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--- a/spec/connection_spec.rb
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+++ b/spec/connection_spec.rb
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@@ -3,7 +3,7 @@
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 describe Connection do
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   before do
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     EventMachine.stub(:send_data)
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-    @connection = Connection.new(mock('EM', :null_object => true))
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+    @connection = Connection.new(mock('EM').as_null_object)
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     @connection.post_init
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     @connection.backend = mock("backend", :ssl? => false)
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     @connection.app = proc do |env|