Added test for issue 23523

pkg/analyzer/test/generated/element_test.dart

Index: pkg/analyzer/test/generated/element_test.dart
diff --git a/pkg/analyzer/test/generated/element_test.dart b/pkg/analyzer/test/generated/element_test.dart
index 13d08e5b9ea4e85444f40ba14808b3558c2fa68a..b52ddee2fa9de160ab116c3f21e4d985b03aec80 100644
--- a/pkg/analyzer/test/generated/element_test.dart
+++ b/pkg/analyzer/test/generated/element_test.dart
@@ -36,6 +36,7 @@ main() {
   runReflectiveTests(ElementImplTest);
   runReflectiveTests(HtmlElementImplTest);
   runReflectiveTests(LibraryElementImplTest);
+  runReflectiveTests(MethodElementImplTest);
   runReflectiveTests(MultiplyDefinedElementImplTest);
   runReflectiveTests(ParameterElementImplTest);
 }
@@ -3863,6 +3864,39 @@ class LibraryElementImplTest extends EngineTestCase {
 }
 
 @reflectiveTest
+class MethodElementImplTest extends EngineTestCase {
+  void test_computeNode() {
+    AnalysisContextHelper contextHelper = new AnalysisContextHelper();
+    AnalysisContext context = contextHelper.context;
+    Source source = contextHelper.addSource("/test.dart", r'''
+abstract class A {
+  String m1() => null;
+  m2();
+}
+''');
+    // prepare CompilationUnitElement
+    LibraryElement libraryElement = context.computeLibraryElement(source);
+    CompilationUnitElement unitElement = libraryElement.definingCompilationUnit;
+    // m1
+    {
+      MethodElement m1Element = unitElement.getType("A").getMethod('m1');
+      MethodDeclaration m1Node = m1Element.computeNode();
+      expect(m1Node, isNotNull);
+      expect(m1Node.name.name, "m1");
+      expect(m1Node.element, same(m1Element));
+    }
+    // m2
+    {
+      MethodElement m2Element = unitElement.getType("A").getMethod('m2');
+      MethodDeclaration m2Node = m2Element.computeNode();
+      expect(m2Node, isNotNull);
+      expect(m2Node.name.name, "m2");
+      expect(m2Node.element, same(m2Element));
+    }
+  }
+}
+
+@reflectiveTest
 class MultiplyDefinedElementImplTest extends EngineTestCase {
   void test_fromElements_conflicting() {
     Element firstElement = ElementFactory.localVariableElement2("xx");