Unit Test Tooling: Test navigation

#KT-6472 In Progress

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

@@ -0,0 +1,12 @@
+// CONFIGURE_LIBRARY: JUnit@lib/junit-4.12.jar
+// REF: (<root>).FooTest2
+// REF: FooTest
+import junit.framework.TestCase;
+
+public class <caret>Foo {
+
+}
+
+public class FooTest extends TestCase {
+
+}