added test case, which explains the problem inside getMockEndpoint

grails-app/conf/BuildConfig.groovy

@@ -22,6 +22,8 @@ grails.project.dependency.resolution = {
 			excludes 'spring-context', 'spring-aop', 'spring-tx', 'groovy-all'
 		}
 		compile("org.apache.camel:camel-stream:${camelVersion}")
+
+		test("org.apache.camel:camel-test:${camelVersion}") { excludes "junit" }
 	}
 
 	plugins {

test/integration/grails/routing/RoutesTests.groovy

@@ -0,0 +1,44 @@
+package grails.routing
+
+import static org.junit.Assert.*
+import org.junit.*
+
+import org.apache.camel.test.junit4.CamelTestSupport
+import org.apache.camel.builder.RouteBuilder
+
+class RoutesTests extends CamelTestSupport {
+
+  def camelContext
+  def producerTemplate
+
+  @Before
+  void setUp() {
+    super.setUp()
+
+    camelContext.addRoutes(
+      new RouteBuilder(){
+        @Override
+        void configure(){
+          from('direct:foo').to('mock:bar')
+        }                             
+      })
+  }
+
+  @After
+  void tearDown() {
+    camelContext.stop()
+  }
+
+  @Test
+  void testSimpleRoute() {
+    def mockEndpoint
+    mockEndpoint = camelContext.getEndpoint('mock:bar')
+    //mockEndpoint = getMockEndpoint('mock:bar')
+
+    mockEndpoint.expectedMessageCount(1)
+
+    producerTemplate.sendBody('direct:foo', 'Hello World')
+
+    mockEndpoint.assertIsSatisfied()
+  }
+}