Start of unit tests for the actual API code

pubspec.yaml

@@ -40,7 +40,9 @@ dependencies:
 dev_dependencies:
   flutter_launcher_icons: ^0.9.0
   lint: ^1.8.0
-  test: ^1.21.0
+  test: ^1.19.0
+  flutter_test:
+    sdk: flutter
 
 flutter_icons:
   android: true
@@ -63,29 +65,3 @@ flutter:
     - assets/sounds/barcode_scan.mp3
     - assets/sounds/barcode_error.mp3
     - assets/sounds/server_error.mp3
-
-  # An image asset can refer to one or more resolution-specific "variants", see
-  # https://flutter.dev/assets-and-images/#resolution-aware.
-
-  # For details regarding adding assets from package dependencies, see
-  # https://flutter.dev/assets-and-images/#from-packages
-
-  # To add custom fonts to your application, add a fonts section here,
-  # in this "flutter" section. Each entry in this list should have a
-  # "family" key with the font family name, and a "fonts" key with a
-  # list giving the asset and other descriptors for the font. For
-  # example:
-  # fonts:
-  #   - family: Schyler
-  #     fonts:
-  #       - asset: fonts/Schyler-Regular.ttf
-  #       - asset: fonts/Schyler-Italic.ttf
-  #         style: italic
-  #   - family: Trajan Pro
-  #     fonts:
-  #       - asset: fonts/TrajanPro.ttf
-  #       - asset: fonts/TrajanPro_Bold.ttf
-  #         weight: 700
-  #
-  # For details regarding fonts from package dependencies,
-  # see https://flutter.dev/custom-fonts/#from-packages