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copied!<p>The easy way is to just do this:</p> <pre><code>helper.params = {:foo => '1', :bar => '2'} </code></pre> <p>But in general it's better to be more integration-y and not "stub" values when it's feasible. So I prefer to use controller tests with <strong>integrate_views</strong>. Then you can specify your params to the <strong>get</strong>, and test that the entire flow works, from sending params to the controller, to having them processed by the controller, and finally to rendering.</p> <p>I also generally prefer to pull out view logic into helpers, which can be easier to test.</p> <p>For instance, say I have a helper called <strong>selection_list</strong>, which returns a Hash whose "selected_preset" key relies on <strong>params[:selected_preset]</strong>, and defaults to 42 if an empty value is specified for the param.</p> <p>Here's a controller test where we've called <strong>integrate_views</strong> (you could of course do the same thing with an actual view test, if you're into that).</p> <pre><code>describe '#show' do describe 'selected_preset' do it 'should default to 42 if no value was entered' do get :show, :params => {:selected_preset => ''} response.template.selection_list[:selected_preset].should == 42 </code></pre> <p>This integration test will alert me if some part of this functionality breaks. But I also would ideally like to have some <em>unit</em> tests to help me <em>pinpoint</em> that breakage.</p> <p>I'll start by having the helper use an instance variable instead of directly accessing params. I'll change the above code by adding a single line directly below the get, as follows:</p> <pre><code>describe '#show' do describe 'selected_preset' do it 'should default to 42 if no value was entered' do get :show, :params => {:selected_preset => ''} assigns[:selected_preset].should == 42 # check instance variable is set response.template.selection_list[:selected_preset].should == 42 </code></pre> <p>Now I also can easily perform a helper unit test:</p> <pre><code>describe MyHelper do describe '#selection_list' do it 'should include the selected preset' do assigns[:selected_preset] = 3 helper.selection_list[:selected_preset].should == 3 </code></pre>

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