Add tests for ClassInheritorsSearch and AnnotatedMembersSearch

Add test for junit

idea/testData/search/junit/testJunit3.kt

@@ -0,0 +1,12 @@
+import junit.framework.TestCase
+
+class Test1: TestCase() {
+    fun test1() {}
+}
+
+class Test2: junit.framework.TestCase() {
+    fun test2() {}
+}
+
+// CLASS: junit.framework.TestCase
+// SEARCH: JetLightClass:Test1, JetLightClass:Test2

idea/testData/search/junit/testJunit4.kt

@@ -0,0 +1,20 @@
+import org.junit.Test
+
+class MyTestClass {
+    [org.junit.Test] fun test1() {}
+
+    org.junit.Test fun test2() {}
+
+    [Test] fun test3() {}
+
+    Test fun test4() {}
+
+    [Deprecated org.junit.Test] fun test5() {}
+
+    [Deprecated Test] fun test6() {}
+
+    fun test7() {}
+}
+
+// ANNOTATION: org.junit.Test
+// SEARCH: PsiMethod:test1, PsiMethod:test2, PsiMethod:test3, PsiMethod:test4, PsiMethod:test5, PsiMethod:test6