Use dependency_validator

pubspec.yaml

@@ -5,6 +5,11 @@ authors:
 - Michael Fenwick <mike@mikefenwick.com>
 - Tim Kluge <timklge@wh2.tu-dresden.de>
 homepage: http://github.com/MichaelFenwick/Color
+
+environment:
+  sdk: '>=1.24.2 <2.0.0'
+
 dev_dependencies:
   browser: any
-  test: any
+  dependency_validator: ^1.1.0
+  test: ^0.12.32+1

smithy.yaml

@@ -1,11 +1,13 @@
 project: dart
 language: dart
 
-# Dart 1.21.1 image from https://github.com/Workiva/smithy-runner-dart/
-runner_image: drydock-prod.workiva.net/workiva/smithy-runner-dart:119662
+# Dart 1.24.2
+runner_image: drydock-prod.workiva.net/workiva/smithy-runner-generator:179735
 
 before_script:
+  - dart --version
   - pub get
+  - pub run dependency_validator -i browser
 
 script:
   - dart test/color_test.dart