title: What does '->' (arrow) mean in gradle's dependency graph?
body: <p>I'm trying to run some Android tests, however, the compiler complains that multiple dex files exist.</p>
  
  <pre><code>Multiple dex files define Lorg/hamcrest/MatcherAssert;
  </code></pre>
  
  <p>So I'm trying to filter duplicated dependencies: <code>$ ./gradlew -q dependencies app:dependencies --configuration androidTestCompile</code></p>
  
  <p>However I get the following output:</p>
  
  <pre><code>------------------------------------------------------------
  Project :app
  ------------------------------------------------------------
  
  androidTestCompile - Classpath for compiling the androidTest sources.
  +--- org.mockito:mockito-core:1.9.5
  |    +--- org.hamcrest:hamcrest-core:1.1 -&gt; 1.3
  |    \--- org.objenesis:objenesis:1.0 -&gt; 2.1
  +--- com.google.dexmaker:dexmaker-mockito:1.2
  |    +--- com.google.dexmaker:dexmaker:1.2
  |    \--- org.mockito:mockito-core:1.9.5 (*)
  +--- com.android.support.test.espresso:espresso-core:2.0
  |    +--- com.squareup:javawriter:2.1.1
  |    +--- org.hamcrest:hamcrest-integration:1.1
  |    |    \--- org.hamcrest:hamcrest-core:1.1 -&gt; 1.3
  |    +--- org.hamcrest:hamcrest-library:1.1
  |    |    \--- org.hamcrest:hamcrest-core:1.1 -&gt; 1.3
  |    +--- javax.inject:javax.inject:1
  |    +--- com.android.support.test.espresso:espresso-idling-resource:2.0
  |    +--- com.android.support.test:testing-support-lib:0.1
  |    |    \--- junit:junit-dep:4.10
  |    |         \--- org.hamcrest:hamcrest-core:1.1 -&gt; 1.3
  |    +--- com.google.code.findbugs:jsr305:2.0.1
  |    +--- javax.annotation:javax.annotation-api:1.2
  |    \--- org.hamcrest:hamcrest-core:1.1 -&gt; 1.3
  +--- com.android.support.test:testing-support-lib:0.1 (*)
  +--- org.powermock:powermock-module-junit4:1.5.6
  |    +--- junit:junit:4.11
  |    |    \--- org.hamcrest:hamcrest-core:1.3
  |    \--- org.powermock:powermock-module-junit4-common:1.5.6
  |         +--- junit:junit:4.4 -&gt; 4.11 (*)
  |         +--- org.powermock:powermock-core:1.5.6
  |         |    +--- org.powermock:powermock-reflect:1.5.6
  |         |    |    \--- org.objenesis:objenesis:2.1
  |         |    \--- org.javassist:javassist:3.18.2-GA
  |         \--- org.powermock:powermock-reflect:1.5.6 (*)
  \--- org.powermock:powermock-api-mockito:1.5.6
       \--- org.powermock:powermock-api-support:1.5.6
            +--- org.powermock:powermock-core:1.5.6 (*)
            \--- org.powermock:powermock-reflect:1.5.6 (*)
  
  (*) - dependencies omitted (listed previously)
  </code></pre>
  
  <p>I'm confused as what the arrows (->) mean. What do they mean?</p>