Add Unit tests

[trevorwang]

No description provided.

[devkabiir]

Checkout: https://pub.dev/packages/source_gen_test
This package makes testing generators very easy.
Example

@ShouldGenerate(
r'''
class _RestClient implements RestClient {
/// generated methods and constructor
}
'''
)
@RestApi()
class RestClient{
/// Constructors and methods
}

[trevorwang]

@devkabiir It will be really appreciated if you can help add some tests.

[devkabiir]

@trevorwang Sure, when I get time, I'll send a PR. Maybe next week. 😊

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.