add regular test dev dep (#33)

diff --git a/pubspec.yaml b/pubspec.yaml
index a51709f..3501d59 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -16,6 +16,7 @@
 dev_dependencies:
   http: ^0.13.0
   pedantic: ^1.10.0
+  test: ^1.16.0
 
 dependency_overrides:
   test: ^1.16.0