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POUnit testing strangeness with Rails fixtures
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  1. POUnit testing strangeness with Rails fixtures
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    copied!<p>Sorry for the vague question title, but I'm having a hard time trying to distil what I'm asking into a one-liner... </p> <p>I have a couple of simple Rails (3.1) models generated via <code>rails g scaffold</code>, which I'm trying to unit test. They are defined in the following way:</p> <pre><code>class ModelA &lt; ActiveRecord::Base validates_presence_of :field1, :field2 validates_uniqueness_of :field1 end class ModelB &lt; ActiveRecord::Base validates_presence_of :field1 validates_uniqueness_of :field1 end </code></pre> <p>I have a couple of fixtures for each model, i.e:</p> <pre><code>model_a_no_field1: field2: test model_a_no_field2: field1: test model_a_ok: field1: test field2: test </code></pre> <p>and</p> <pre><code>model_b_no_field1: model_b_ok: field1: test </code></pre> <p>My unit tests are testing these validations:</p> <pre><code>class ModelATest &lt; ActiveSupport::TestCase test "field1 should be present" do assert !model_as(:model_a_no_field1).valid? end test "field2 should be present" do assert !model_as(:model_a_no_field2).valid? end test "field1 should be unique" do model_a = model_as(:model_a_ok) model_a.save assert !model_as(:model_a_ok).valid? end end </code></pre> <p>These tests all pass correctly. However, my similar unit tests for <code>ModelB</code>:</p> <pre><code>class ModelBTest &lt; ActiveSupport::TestCase test "field1 should be present" do assert !model_bs(:model_b_no_field1).valid? end test "field1 should be unique" do model_b = model_bs(:model_b_ok) model_b.save assert !model_bs(:model_b_ok).valid? end end </code></pre> <p>Fail on the second test (testing the uniqueness).</p> <p>I'm almost certain this is to do with the empty YAML fixture for <code>model_b_no_field1</code>, but I'm not sure. I can cause the test to pass by replacing the test method body with</p> <pre><code>test "field1 should be unique" do model_b = model_bs(:model_b_ok) model_b.save model_b2 = ModelB.new assert !model_b2.valid? end </code></pre> <p>Which is fine, but I'd like to understand what's happening here.</p>
 

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