junit: reject tests without method name during building of a tree (IDEA-158727)

(cherry picked from commit f426e0ee)

plugins/junit/test/com/intellij/execution/junit/JUnitTreeByDescriptionHierarchyTest.java

@@ -34,7 +34,6 @@ public class JUnitTreeByDescriptionHierarchyTest {
   @Test
   public void testEmptySuite() throws Exception {
     doTest(Description.createSuiteDescription("empty suite"), "##teamcity[enteredTheMatrix]\n" +
-                                                              "##teamcity[suiteTreeNode name='empty suite' locationHint='java:test://empty suite.empty suite']\n" +
                                                               "##teamcity[treeEnded]\n");
   }
 

plugins/junit_rt/src/com/intellij/junit4/JUnit4TestListener.java

@@ -306,6 +306,12 @@ public class JUnit4TestListener extends RunListener {
   }
 
   private String getFullMethodName(Description description, Description parent) {
+    return getFullMethodName(description, parent, false);
+  }
+
+  private String getFullMethodName(Description description,
+                                   Description parent,
+                                   boolean acceptNull) {
     String methodName = (String)myMethodNames.get(description);
     if (methodName == null) {
       methodName = JUnit4ReflectionUtil.getMethodName(description);
@@ -313,7 +319,7 @@ public class JUnit4TestListener extends RunListener {
         methodName = getShortName(JUnit4ReflectionUtil.getClassName(description)) + "." + methodName;
       }
 
-      if (methodName == null && description.getChildren().isEmpty()) {
+      if (!acceptNull && methodName == null && description.getChildren().isEmpty()) {
         methodName = getShortName(description.getDisplayName());
       }
 
@@ -463,7 +469,7 @@ public class JUnit4TestListener extends RunListener {
 
     String className = JUnit4ReflectionUtil.getClassName(description);
     if (description.isTest()) {
-      final String methodName = getFullMethodName((Description)description, parent);
+      final String methodName = getFullMethodName((Description)description, parent, true);
       if (methodName != null ) {
         if (isWarning(methodName, className) && parent != null) {
           className = JUnit4ReflectionUtil.getClassName(parent);