Test isEnabled with context

[gastonfournier]

About the changes

This is just a test to validate #181

This validates that the context is not being dropped.

Looking into the details:

1. isEnabled with toggle name and context calls isEnabled with toggle name, context and false as defaultSetting:

   unleash-client-java/src/main/java/io/getunleash/Unleash.java

   Lines 11 to 13 in 3e4b525

   	default boolean isEnabled(String toggleName, UnleashContext context) {
   	return isEnabled(toggleName, context, false);
   	}

2. Certainly the default implementation is dropping the context:

   unleash-client-java/src/main/java/io/getunleash/Unleash.java

   Lines 15 to 17 in 3e4b525

   	default boolean isEnabled(String toggleName, UnleashContext context, boolean defaultSetting) {
   	return isEnabled(toggleName, defaultSetting);
   	}

3. But that default method is not invoked because the default client overrides the default implementation:

   unleash-client-java/src/main/java/io/getunleash/DefaultUnleash.java

   Lines 93 to 97 in 3e4b525

   	@Override
   	public boolean isEnabled(
   	final String toggleName, final UnleashContext context, final boolean defaultSetting) {
   	return isEnabled(toggleName, context, (n, c) -> defaultSetting);
   	}

Discussion points

1. The default methods in the interface seem to be shortcuts for testing (FakeUnleash) but they don't provide the proper implementation for a production system that may want to implement Unleash interface (they should remember to implement that method). For being error-prone I consider we should not have a default implementation for Unleash interface, but that's a breaking change and we should discuss it
2. I get also confused by another method dropping the fallbackAction and it might be better to have a method receiving all the parameters and this should be the only one you should implement: isEnabled(toggleName, context, fallbackAction, defaultSetting); but I need to dig deeper on the meaning of those parameters and if it makes sense to have both.

I'll talk about this with @chriswk who may have more context

[gastonfournier]

Closing as this use case should be already covered by client specification tests, in particular https://github.com/Unleash/client-specification/blob/main/specifications/02-user-with-id-strategy.json