Add a simple plugin test

[martinbonnin]

Keeping the ball rolling after FOSDEM :)

This pull request will help implementing and testing gradle lazy configuration (#63)

It adds a very basic plugin test. The test just checks that the generateSwagger task is properly executed. More tests can be added later.

[cortinico]

Hey @martinbonnin 👋 Happy to see you here!
That's a great addition to the project and we would love to see it shipped 🚢

I left some comments around, please let me know what do you think and how do you want to proceed. Thank you again for the contrib.

[cortinico]

You can safely replace with:

tasks.withType<Test> {
    dependsOn("publishToMavenLocal")
}

And use MavenLocal for the whole testing scenario.

[martinbonnin]

I don't like that too much since mavenLocal is global to the machine and might contain other artifacts that will be pulled in tests inadvertently. Doing everything inside the repo makes sure everything is contained.

[cortinico]

Doing everything inside the repo makes sure everything is contained.

I see your point, but then having this in the test gradle file would probably suffice as well:

    mavenLocal {
      content {
        includeGroup("com.yelp.codegen")
      }
    }

This will make sure mavenLocal is used only for com.yelp.codegen and nothing else.

[martinbonnin]

But then there's the other side of the thing. Using mavenLocal will add the plugin under test to the global repo, which a user might end up pulling a few weeks later inadvertently when wanting to pull something else from mavenLocal.

Overall, I find adding

configure<PublishingExtension> {
    repositories {
        maven {
            name = "pluginTest"
            url = uri("file://${rootProject.buildDir}/localMaven")
        }
    }
}

is a ok price to pay for proper isolation.

[cortinico]

Looks good to me. Let's fix those small issues and we're good to go 🚢
Side note: please use the "re-request review" button when you want me to do another pass on it otherwise I might miss the PR ;)

[cortinico]

Awesome first contrib 💪