Index: src/test/java/org/apache/maven/project/MavenProjectTest.java
===================================================================
--- src/test/java/org/apache/maven/project/MavenProjectTest.java	(revision 595587)
+++ src/test/java/org/apache/maven/project/MavenProjectTest.java	(working copy)
@@ -23,6 +23,7 @@
 import org.apache.maven.model.Parent;
 import org.apache.maven.model.DependencyManagement;
 import org.apache.maven.model.Dependency;
+import org.apache.maven.artifact.DependencyResolutionRequiredException;
 import org.apache.maven.artifact.versioning.ManagedVersionMap;
 
 import java.io.File;
@@ -35,6 +36,22 @@
     extends AbstractMavenProjectTestCase
 {
 
+    public void testTestClasspathOrdering()
+        throws DependencyResolutionRequiredException
+    {
+        Model model = new Model();
+
+        MavenProject project = new MavenProject( model );
+        project.getBuild().setOutputDirectory( "main" );
+        project.getBuild().setTestOutputDirectory( "test" );
+
+        List testClasspath = project.getTestClasspathElements();
+
+        // test-classes should be before main-classes, see MNG-3118
+        assertEquals( "test", new File( (String) testClasspath.get( 0 ) ).getName() );
+        assertEquals( "main", new File( (String) testClasspath.get( 1 ) ).getName() );
+    }
+
     public void testShouldInterpretChildPathAdjustmentBasedOnModulePaths()
         throws IOException
     {