TestFairy tasks are not created if plugin is applied before Android Application plugin

[rkoliver311]

If Gradle applies the TestFairy plugin before the Android Application plugin the TestFairy plugin fails to create any tasks.

Even if the Android Application plugin appears before the TestFairy plugin:

plugins {
    'com.android.application'
    'testfairy'
}

a plugin developer cannot assume that the Android Application plugin will be applied before the TestFairy plugin. The PluginManager interface provides a mechanism for delaying apply logic until the necessary plugins have also been applied:

class TestFairyPlugin implements Plugin<Project> {
@Override
void apply(Project project) {

    // create an extension where the apiKey and such settings reside
    def extension = project.extensions.create("testfairyConfig", TestFairyExtension, project)

    project.pluginManager.withPlugin("com.android.application") {
        // ...
    }
}

The closure provided to PluginManager.withPlugin() will be executed once the specified plugin ("com.android.application") is applied.

Thanks.