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@@ -10,7 +10,7 @@ module Spec
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       # add_stubs) if +stubs+ is passed.
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       def mock_model(model_class, options_and_stubs = {})
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         id = options_and_stubs[:id] || next_id
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-        options_and_stubs.reverse_merge!({
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+        options_and_stubs = options_and_stubs.reverse_merge({
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           :id => id,
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           :to_param => id.to_s,
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           :new_record? => false,

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@@ -25,6 +25,14 @@ describe "mock_model" do
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   end
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 end
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+describe "mock_mode with params" do
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+  it "should not mutate its parameters" do
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+    params = {:a => 'b'}
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+    model = mock_model(MockableModel, params)
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+    params.should == {:a => 'b'}
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+  end
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+end
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+
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 describe "mock_model with stubbed id", :type => :view do
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   before(:each) do
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     @model = mock_model(MockableModel, :id => 1)