Issue 21612. Support for multiple returns in the 'Extract Method' refactoring.

pkg/analysis_server/test/services/refactoring/extract_method_test.dart

Index: pkg/analysis_server/test/services/refactoring/extract_method_test.dart
diff --git a/pkg/analysis_server/test/services/refactoring/extract_method_test.dart b/pkg/analysis_server/test/services/refactoring/extract_method_test.dart
index 67e46cc94632280ac070e36e919593c7610bd0de..c21cbb8c03e5ec6c14ea1cd732708a161f7db6d3 100644
--- a/pkg/analysis_server/test/services/refactoring/extract_method_test.dart
+++ b/pkg/analysis_server/test/services/refactoring/extract_method_test.dart
@@ -2189,6 +2189,95 @@ int res() {
 ''');
   }
 
+  test_statements_return_multiple_ifElse() {
+    indexTestUnit('''
+num main(bool b) {
+// start
+  if (b) {
+    return 1;
+  } else {
+    return 2.0;
+  }
+// end
+}
+''');
+    _createRefactoringForStartEndComments();
+    // apply refactoring
+    return _assertSuccessfulRefactoring('''
+num main(bool b) {
+// start
+  return res(b);
+// end
+}
+
+num res(bool b) {
+  if (b) {
+    return 1;
+  } else {
+    return 2.0;
+  }
+}
+''');
+  }
+
+  test_statements_return_multiple_ifThen() {
+    indexTestUnit('''
+num main(bool b) {
+// start
+  if (b) {
+    return 1;
+  }
+  return 2.0;
+// end
+}
+''');
+    _createRefactoringForStartEndComments();
+    // apply refactoring
+    return _assertSuccessfulRefactoring('''
+num main(bool b) {
+// start
+  return res(b);
+// end
+}
+
+num res(bool b) {
+  if (b) {
+    return 1;
+  }
+  return 2.0;
+}
+''');
+  }
+
+  test_statements_return_multiple_ignoreInFunction() {
+    indexTestUnit('''
+int main() {
+// start
+  localFunction() {
+    return 'abc';
+  }
+  return 42;
+// end
+}
+''');
+    _createRefactoringForStartEndComments();
+    // apply refactoring
+    return _assertSuccessfulRefactoring('''
+int main() {
+// start
+  return res();
+// end
+}
+
+int res() {
+  localFunction() {
+    return 'abc';
+  }
+  return 42;
+}
+''');
+  }
+
   test_statements_return_single() {
     indexTestUnit('''
 main() {