Issue 21372. "Convert into block body" and "Convert into expression body" for factory constructors.

pkg/analysis_server/test/services/correction/assist_test.dart

Index: pkg/analysis_server/test/services/correction/assist_test.dart
diff --git a/pkg/analysis_server/test/services/correction/assist_test.dart b/pkg/analysis_server/test/services/correction/assist_test.dart
index d37d3e635eda96b82ef63508ce6e2491eaf25337..c6a64b40c366d7b619675988c810ab59f94ad5f7 100644
--- a/pkg/analysis_server/test/services/correction/assist_test.dart
+++ b/pkg/analysis_server/test/services/correction/assist_test.dart
@@ -442,6 +442,36 @@ fff() => 42;
 ''');
   }
 
+  void test_convertToExpressionBody_OK_constructor() {
+    _indexTestUnit('''
+class A {
+  factory A() {
+    return null;
+  }
+}
+''');
+    assertHasAssistAt('A()', AssistKind.CONVERT_INTO_EXPRESSION_BODY, '''
+class A {
+  factory A() => null;
+}
+''');
+  }
+
+  void test_convertToBlockBody_OK_constructor() {
+    _indexTestUnit('''
+class A {
+  factory A() => null;
+}
+''');
+    assertHasAssistAt('A()', AssistKind.CONVERT_INTO_BLOCK_BODY, '''
+class A {
+  factory A() {
+    return null;
+  }
+}
+''');
+  }
+
   void test_convertToExpressionBody_OK_method_onBlock() {
     _indexTestUnit('''
 class A {