Issue 26335. Insert an empty line if the class body is a single line.

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

Index: pkg/analysis_server/test/services/correction/fix_test.dart
diff --git a/pkg/analysis_server/test/services/correction/fix_test.dart b/pkg/analysis_server/test/services/correction/fix_test.dart
index 5244097290c6518adeacff56a2d9c881f6f79b62..5bde96667d304eec57c3c2bfd8981c18ac41ee2e 100644
--- a/pkg/analysis_server/test/services/correction/fix_test.dart
+++ b/pkg/analysis_server/test/services/correction/fix_test.dart
@@ -1011,8 +1011,7 @@ main() {
 class A {
   int field;
 
-  A(int i, double d) {
-  }
+  A(int i, double d);
 
   method() {}
 }
@@ -1035,8 +1034,7 @@ main() {
         DartFixKind.CREATE_CONSTRUCTOR,
         '''
 class A {
-  A.named(int i, double d) {
-  }
+  A.named(int i, double d);
 
   method() {}
 }
@@ -1047,6 +1045,26 @@ main() {
     _assertLinkedGroup(change.linkedEditGroups[0], ['named(int ', 'named(1']);
   }
 
+  test_createConstructor_named_emptyClassBody() async {
+    resolveTestUnit('''
+class A {}
+main() {
+  new A.named(1);
+}
+''');
+    await assertHasFix(
+        DartFixKind.CREATE_CONSTRUCTOR,
+        '''
+class A {
+  A.named(int i);
+}
+main() {
+  new A.named(1);
+}
+''');
+    _assertLinkedGroup(change.linkedEditGroups[0], ['named(int ', 'named(1']);
+  }
+
   test_createConstructorForFinalFields_inTopLevelMethod() async {
     resolveTestUnit('''
 main() {
@@ -2569,6 +2587,30 @@ class B extends A {
     }
   }
 
+  test_createMissingOverrides_method_emptyClassBody() async {
+    resolveTestUnit('''
+abstract class A {
+  void foo();
+}
+
+class B extends A {}
+''');
+    await assertHasFix(
+        DartFixKind.CREATE_MISSING_OVERRIDES,
+        '''
+abstract class A {
+  void foo();
+}
+
+class B extends A {
+  @override
+  void foo() {
+    // TODO: implement foo
+  }
+}
+''');
+  }
+
   test_createMissingOverrides_operator() async {
     resolveTestUnit('''
 abstract class A {