[ISSUE] Suggested improvement to allow dependency overrides and internal injector configuration modification that differs from defaults

[lestephane]

Description

When I want to run tests against a lambda function handler directly (not against an individual use case), I typically have one InjectorConfiguration that is the canonical configuration, and need to override it selectively from within test cases.

If the backbone of my lambda function handler is a usecasemaid, I need to pass the configuration overrides to usecasemaid.

This is currently not possible.

Suggested improvement

add a withDependencyOverrides(...) to UseCaseMaidBuilder, that takes vararg InjectorConfigurations.

(inspired by: https://xvik.github.io/dropwizard-guicey/5.0.0/guide/guice/override/)

[lestephane]

Another suggested improvement

add a withInjectorConfiguration() as well, similar to the existing withMappingConfiguration(Recipe), otherwise there is no way to override the default singleton type in the internal injector used by usecasemaid. This becomes important when developing for lambda, where you want to be sure every singleton where the developer is using DEFAULT_SINGLETON_TYPE is eagerly be instantiated. This is not the default behaviour.

[EDIT: 2021-02-18]: there is already a withDependencies(...) method I can use for this. I did not think of using it. In order for me to find it more easily next time, I use the following extension:

fun UseCaseMaidBuilder.withInjectorConfiguration(
    vararg configs: InjectorConfiguration
): UseCaseMaidBuilder {
    configs.forEach { this.withDependencies(it) }
    return this
}