Record HAS_ANCESTOR relations into index.

pkg/analysis_server/test/services/index/dart_index_contributor_test.dart

Index: pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
diff --git a/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart b/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
index 4cfd8cdcf3a3f54b076a8efefed418b53f768ef4..a23f0ef9f6a2bf709b0face2cad39b531e345926 100644
--- a/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
+++ b/pkg/analysis_server/test/services/index/dart_index_contributor_test.dart
@@ -161,6 +161,84 @@ main() {
         IndexConstants.IS_READ_BY, _expectedLocation(mainElement, 'v in []'));
   }
 
+  void test_hasAncestor_ClassDeclaration() {
+    _indexTestUnit('''
+class A {}
+class B1 extends A {}
+class B2 implements A {}
+class C1 extends B1 {}
+class C2 extends B2 {}
+class C3 implements B1 {}
+class C4 implements B2 {}
+class M extends Object with A {}
+''');
+    // prepare elements
+    ClassElement classElementA = findElement("A");
+    ClassElement classElementB1 = findElement("B1");
+    ClassElement classElementB2 = findElement("B2");
+    ClassElement classElementC1 = findElement("C1");
+    ClassElement classElementC2 = findElement("C2");
+    ClassElement classElementC3 = findElement("C3");
+    ClassElement classElementC4 = findElement("C4");
+    ClassElement classElementM = findElement("M");
+    // verify
+    _assertRecordedRelationForElement(
+        classElementA,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementB1, 'B1 extends A'));
+    _assertRecordedRelationForElement(
+        classElementA,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementB2, 'B2 implements A'));
+    _assertRecordedRelationForElement(
+        classElementA,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementC1, 'C1 extends B1'));
+    _assertRecordedRelationForElement(
+        classElementA,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementC2, 'C2 extends B2'));
+    _assertRecordedRelationForElement(
+        classElementA,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementC3, 'C3 implements B1'));
+    _assertRecordedRelationForElement(
+        classElementA,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementC4, 'C4 implements B2'));
+    _assertRecordedRelationForElement(
+        classElementA,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementM, 'M extends Object with A'));
+  }
+
+  void test_hasAncestor_ClassTypeAlias() {
+    _indexTestUnit('''
+class A {}
+class B extends A {}
+class C1 = Object with A;
+class C2 = Object with B;
+''');
+    // prepare elements
+    ClassElement classElementA = findElement("A");
+    ClassElement classElementB = findElement("B");
+    ClassElement classElementC1 = findElement("C1");
+    ClassElement classElementC2 = findElement("C2");
+    // verify
+    _assertRecordedRelationForElement(
+        classElementA,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementC1, 'C1 = Object with A'));
+    _assertRecordedRelationForElement(
+        classElementA,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementC2, 'C2 = Object with B'));
+    _assertRecordedRelationForElement(
+        classElementB,
+        IndexConstants.HAS_ANCESTOR,
+        _expectedLocation(classElementC2, 'C2 = Object with B'));
+  }
+
   void test_IndexableName_field() {
     _indexTestUnit('''
 class A {