Add tests to Redirection Example

[Lyokone]

✨ What kind of change does this PR introduce? (Bug fix, feature, docs update...)

Add tests to Redirection Example and Mockito for creating a MockGoRouter

⤵️ What is the current behavior?

No tests

🆕 What is the new behavior (if this is a feature change)?

Test the redirection example

💥 Does this PR introduce a breaking change?

No

🐛 Recommendations for testing

Run in example folder

flutter test --no-pub --coverage --test-randomize-ordering-seed random

To generate coverage. You can use LCOV to see the coverage of the example app.
The redirection.dart is at 95.8% of Coverage with this PR.

📝 Links to relevant issues/docs

Not sure if I should update changelog since it's only testing the examples.

🤔 Checklist before submitting

• I made sure all projects build.
• I updated CHANGELOG.md to add a description of the change.
• I updated the relevant documentation.
• I updated the relevant code example.
• I rebased onto current master.

[csells]

@Lyokone can you fix the style issue and resubmit? Likely dart format . will solve the problem.

[Lyokone]

It should be fixed now :)

[csells]

@chunhtai @Lyokone This PR is something to land after the PR bring go_router to flutter/packages has landed.

[Lyokone]

I can definitely resubmit this PR to flutter/package if needed 😊

[chunhtai]

@Lyokone yes please do. we are trying to bring the package into the flutter/package within this week.

[chunhtai]

this package has been moved to https://github.com/flutter/packages/tree/main/packages/go_router

Can you create a pull request against the flutter/packages instead?