title: Running Spek test shows error "Empty test suite"
body: <p>Gotten familiar a bit with Kotlin I wanted to introduce it another Android-Java project, as a first step for testing only. I decided to start straight with <a href="https://jetbrains.github.io/spek/" rel="nofollow">Spek</a>.</p>
  
  <p>I added the following dependencies to build.gradle of the module to be tested:</p>
  
  <pre><code>testCompile 'junit:junit:4.12'
  testCompile "org.jetbrains.kotlin:kotlin-stdlib:1.0.2"
  testCompile "org.jetbrains.kotlin:kotlin-test-junit:1.0.2"
  testCompile "org.jetbrains.spek:spek:1.0.25"
  </code></pre>
  
  <p>Among others I used the <a href="https://github.com/JetBrains/spek/blob/master/spek-samples/src/main/kotlin/org/jetbrains/spek/samples/SimpleTest.kt" rel="nofollow">SimpleTest</a> class of spek-samples of the git repo:</p>
  
  <pre><code>import org.jetbrains.spek.api.Spek
  import kotlin.test.assertEquals
  
  
  class SampleCalculator
  {
      fun sum(x: Int, y: Int) = x + y
      fun subtract(x: Int, y: Int) = x - y
  }
  
  class SimpleTest : Spek({
      describe("a calculator") {
          val calculator = SampleCalculator()
  
          it("should return the result of adding the first number to the second number") {
              val sum = calculator.sum(2, 4)
              assertEquals(6, sum)
          }
  
          it("should return the result of subtracting the second number from the first number") {
              val subtract = calculator.subtract(4, 2)
              assertEquals(2, subtract)
          }
      }
  })
  </code></pre>
  
  <p>The code compiles and in Android Studio I am shown a green play button next to the class declaration to run the tests of the class. However, doing so results in </p>
  
  <pre><code>Process finished with exit code 1
  Class not found: "com.anfema.ionclient.serialization.SimpleTest"Empty test suite.
  </code></pre>
  
  <p>I created JUnit3 and JUnit4 tests of which all ran without any problems.</p>
  
  <p>Did I miss any additional configuration step for Spek tests?</p>