Programmatically invoke a gradle task graph in a unit test

Question

I am in the process of writing a custom plugin for gradle and as part of the unit testing I would like to invoke my task but in such away as it's prerequisite tasks are executed.

The actual plugin is unfortunately an internal project so I can't sure the exact source, but I have prepared a unit test that demonstrates the problem:

package toy

import org.gradle.api.Project
import org.gradle.testfixtures.ProjectBuilder
import org.junit.Test

class ToyTasksTest {

    boolean task1Run = false
    boolean task2Run = false

    @Test
    public void taskDependencies(){


        Project p = ProjectBuilder.builder().build()

        p.task("task1") << {
            p.logger.info("task1 running")
            task1Run = true
        }

        def task2 = p.task("task2", dependsOn: 'task1') << {
            p.logger.info("task2 running")
            task2Run = true
        }
        task2.execute() // <--- what magic do I need here instead of .execute()

        assert task2Run == true
        assert task1Run == true
    }
}

The output is:

Assertion failed: 

assert task2Run == true
       |        |
       false    false

The project is available on github if you would like to quickly run the test.

Another way of saying this instead of writing:

task2.execute()

I'd like run the equivalent of:

gradle task2

In the unit test.

Answer 1

Replace:

task2.execute() // <--- what magic do I need here instead of .execute()

With:

task2.actions.each { Action action ->
     action.execute(task2)
}

Answer 2

Luke Daley (Gradle core dev) developed a cool functional testing system for my Gradle plugins, seen in use here.

Similar to @erdi's answer, this is a functional testing solution and does not use Gradle's ProjectBuilder. It requires that you include these utility classes for testing.

I realize that it's not the succinct answer you might have hoped for, but this system has served me very well while I develop a few Gradle plugins.