Testing Custom Gradle Plugins: Providing Configuration Data - gradle

Question

I am trying to test a custom Gradle plugin that is configured via an Extension object that would normally be present in the build.gradle file.
For example, my build.gradle would normally look something like this:
{
apply plugin: 'foobarConfigurator'
[... stuff ...]
foobarConfig {
bar = 'boop'
baz = 'baap'
bot = 'faab'
}
[... stuff ...]
}
In my custom plugin class I have code that does this in the apply method:
def config = project.extensions.create('foobarConfig', FooBarConfig)
It's unclear to me how in a JUnit test I should write my test methods so that I can provide and test for different configuration values in a foobarConfiguration in a Project instance created by the ProjectBuilder class.
Any help appreciated, thanks!

Answer 1

If you intend to write a JUnit test for your extension, you can simply create an instance and configure it programmatically:
class FooBarConfigTest {
private FooBarConfig fooBarConfig
#Before
public void before() {
fooBarConfig = new FooBarConfig()
}
#Test
public void example() {
fooBarConfig.bar = 'boop'
assertEquals("expectedIfBarIsBoop", fooBarConfig.someMethod())
}
}
On the other hand, to test the plugin itself, you can use a ProjectBuilder and find the extension by type:
class MyPluginTest {
private MyPlugin plugin
private Project project
#Before
public void before() {
project = ProjectBuilder.builder().build();
plugin = new MyPlugin()
plugin.apply(project)
}
#Test
public void example() {
FooBarConfig foobarConfig = project.extensions.findByType(FooBarConfig)
assertNotNull(foobarConfig)
foobarConfig.bar = 'boop'
}
}