'Because testing_app requires SDK version >=2.16.1 <3.0.0, version solving failed. in flutter

I am learning more about testing and i want to use Mockito Package and Build Runner Packate then i have my class Cat inside lib/models/cat.dart

My cat class

then i have my lib/test/cat_test.dart file to test cat class

cat_test.dart file

this is my pubspec.yaml (part of it)

Pubspec.yaml

The problem is thrown when i want to run the next command :

dart run build_runner build

and the problem is the next:

Resolving dependencies in /Users/adm/Documents/Things of david/PRACTICAS/Flutter/testing_app... The current Dart SDK version is 2.15.1. Because testing_app requires SDK version >=2.16.1 <3.0.0, version solving failed.

Flutter doctor:

Flutter doctor

thank you so much for your help.

flutterdartmockitobuild-runner


Solution 1:[1]

The answer is in the error message:

The current Dart SDK version is 2.15.1. Because testing_app requires SDK version >=2.16.1 <3.0.0, version solving failed.

It means that the project needs Dart SDK in version 2.16.1 (at least), and your version is 2.15.1.

You should upgrade your Flutter version with flutter upgrade. For more info see the documentation.

Solution 2:[2]

I had a similar problem and solved it by changing the environment sdk version.

Open the project pubspec yaml file and next to environment: sdk:, change the version number to the minimum version required by the package or app as instructed in the error message.

I had to downgrade my sdk version from from ">=2.17.0-182.0.dev <3.0.0" to ">=2.16.0-182.0.dev <3.0.0".

Screenshot showing pubspec yaml file

Solution 3:[3]

Flutter upgrade solves this. Kindly try it

Sources

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Source: Stack Overflow

Solution Source
Solution 1 pszklarska
Solution 2 Sharon
Solution 3 Victorhez

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