Unit Test Tooling: Test navigation

#KT-6472 In Progress

idea/testData/navigation/gotoTestOrCode/fromJavaTestToKotlinClass.main.java

@@ -0,0 +1,7 @@
+// CONFIGURE_LIBRARY: JUnit@lib/junit-4.12.jar
+// REF: (<root>).Foo
+import junit.framework.TestCase;
+
+public class <caret>FooTest extends TestCase {
+
+}