diff --git a/test/config_test.dart b/test/config_test.dart
index 90a85ef..82280bc 100644
--- a/test/config_test.dart
+++ b/test/config_test.dart
@@ -19,11 +19,12 @@ exclude:
           },
         },
       );
+      final stdout = result.stdout;
 
       // Since the code generation doesn't actually run the command should succeed
       expect(result.exitCode, ExitCode.success.code);
 
-      expectLine(result, [path.join('puby_yaml_test'), 'Skip']);
+      expectLine(stdout, [path.join('puby_yaml_test'), 'Skip']);
     });
   });
 }
diff --git a/test/test_utils.dart b/test/test_utils.dart
index 365dd8f..032dc9e 100644
--- a/test/test_utils.dart
+++ b/test/test_utils.dart
@@ -55,7 +55,7 @@ Future<PubyProcessResult> testCommand(
   );
 }
 
-void expectLine(dynamic stdout, List<String> matchers, {bool matches = true}) {
+void expectLine(String stdout, List<String> matchers, {bool matches = true}) {
   final lines = (stdout as String).split('\n');
   expect(
     lines.any(