check if abstract test class has non abstract inheritor -> its test methods are used

java/java-tests/testData/inspection/deadCode/junitAbstractClassWithInheritor/expected.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems/>

java/java-tests/testData/inspection/deadCode/junitAbstractClassWithInheritor/src/ChildTest.java

@@ -0,0 +1 @@
+public class ChildTest extends AbstractTest {}

java/java-tests/testData/inspection/deadCode/junitAbstractClassWithInheritor/src/Test.java

@@ -0,0 +1,4 @@
+public abstract class AbstractTest {
+  @org.junit.Test
+  public void testSmth() {}
+}

java/java-tests/testData/inspection/deadCode/junitAbstractClassWithoutInheritor/expected.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<problems>
+  <problem>
+    <file>Test.java</file>
+    <line>3</line>
+    <entry_point TYPE="method" FQNAME="AbstractTest void testSmth()"/>
+    <description>Method is never used.</description>
+  </problem>
+</problems>

java/java-tests/testData/inspection/deadCode/junitAbstractClassWithoutInheritor/src/Test.java

@@ -0,0 +1,4 @@
+public abstract class AbstractTest {
+  @org.junit.Test
+  public void testSmth() {}
+}