title: How to write unit testing case for classes in the grails-app/utils folder in Grails 2.3.0
body: <p>I write a utility class in the grails-app/utils :</p>
  
  <pre><code>package com.demo.formatter
  
  class FooFormatter {
      static def foo() {
          return true
      }
  }
  </code></pre>
  
  <p>and, write a unit test case in the test/unit :</p>
  
  <pre><code>package com.demo.test.formatter
  
  @RunWith(JUnit4)
  class FooFormatterTests {
      @Test
      void testFoo() {
          AssertTrue(FooFormatter.foo())
      }
  }
  </code></pre>
  
  <p>and then, run testing case with Intellij Idea IDE, but I always got the error message like following:</p>
  
  <pre><code>Class not found: "com.demo.test.formatter.FooFormatterTests" 
  </code></pre>
  
  <p>Did I do something wrong ?</p>
  
  <p>Thanks</p>