Use dart_dev to format so that

.github/workflows/dart_ci.yml

@@ -35,7 +35,7 @@ jobs:
         if: always() && steps.install.outcome == 'success'
 
       - name: Verify formatting
-        run: dart format --output=none --line-length=120 --set-exit-if-changed .
+        run: dart run dart_dev format --check
         if: ${{ matrix.sdk == '2.18.7' }}
 
       - name: Analyze project source

pubspec.yaml

@@ -12,6 +12,7 @@ dev_dependencies:
   build_runner: ^2.1.2
   build_test: ^2.1.3
   build_web_compilers: ^3.0.0
+  dart_dev: ^4.0.0
   dependency_validator: ^3.2.2
   matcher: ^0.12.11
   mockito: ^5.3.1

tool/dart_dev/config.dart

@@ -0,0 +1,25 @@
+// Copyright 2023 Workiva Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import 'package:dart_dev/dart_dev.dart';
+import 'package:glob/glob.dart';
+
+final config = {
+  'format': FormatTool()
+    ..formatterArgs = ['--line-length=120']
+    ..exclude = [
+      // Don't format generated mockito files.
+      Glob('test/mockito.mocks.dart'),
+    ],
+};