# Classes as Dependencies

Before diving deeper into the **Dependency Injection** system, let's upgrade the previous example.

## A `dict` from the previous example

In the previous example, we were returning a `dict` from our dependency ("dependable"):

=== "Python 3.10+"

    ```Python hl_lines="9"
    {!> ../../../docs_src/dependencies/tutorial001_an_py310.py!}
    ```

=== "Python 3.9+"

    ```Python hl_lines="11"

Method <org.gradle.api.Project.ant(groovy.lang.Closure)> has arguments/return type groovy.lang.Closure that is not Gradle public API or primitive or built-in JDK classes or Kotlin classes in (Project.java:0)
Method <org.gradle.api.Project.artifacts(groovy.lang.Closure)> has arguments/return type groovy.lang.Closure that is not Gradle public API or primitive or built-in JDK classes or Kotlin classes in (Project.java:0)

        return otherVersion
    }

    def getDocsPath() {
        return classes.isScala3() ? "build/docs/scaladoc/_empty_" : "build/docs/scaladoc"
    }

    def setup() {
        classes.scalaVersion = version.toString()
    }

    def "scaladoc produces output"() {
        classes.baseline()
        buildScript(classes.buildScript())

        when:
        succeeds scaladoc

        then:

        assertStateStored()
        result.assertTasksExecuted(":compileJava", ":processResources", ":classes", ":jar", ":compileTestJava", ":processTestResources", ":testClasses", ":test", ":assemble", ":check", ":build")
        def classFile = file("build/classes/java/main/Thing.class")
        classFile.isFile()
        def testClassFile = file("build/classes/java/test/ThingTest.class")
        testClassFile.isFile()

		// objects into the page, we might as well
		// use just this size instead of having two
		// different sizes.
		if len(classes) > 1 && npages == classes[len(classes)-1].npages && allocsize/size == allocsize/classes[len(classes)-1].size {
			classes[len(classes)-1].size = size
			continue
		}
		classes = append(classes, class{size: size, npages: npages})
	}

	// Increase object sizes if we can fit the same number of larger objects

#
#Fri Jan 19 18:01:32 EST 2024
classes\ that\ are\ Gradle\ public\ API\ should\ have\ accessors\ with\ symmetrical\ @Nullable\ annotations=public-api-symmetrical-accessors-nullability.txt
classes\ that\ are\ Gradle\ public\ API\ should\ not\ have\ direct\ super-class\ or\ interface\ that\ are\ Gradle\ Internal\ API=public-api-not-extends-internal-types.txt

| <<<javadoc>>>         | <<<javadoc>>> | <<<jar>>>  | java      | classes               |                       |
*-----------------------+---------------+------------+-----------+-----------------------+-----------------------+
| <<<test-jar>>>        | <<<tests>>>   | <<<jar>>>  | java      | classes, patch module |                       |

                // Java types
                new DefaultType(
                        Type.JAR, Language.JAVA_FAMILY, "jar", null, false, JavaPathType.CLASSES, JavaPathType.MODULES),
                new DefaultType(Type.JAVADOC, Language.JAVA_FAMILY, "jar", "javadoc", false, JavaPathType.CLASSES),

        index.assertHasOverallResult("failures")

        index.assertHasFailedTest('classes/org.gradle.failing.SomeIgnoredSomePassedSomeFailed', 'failed')

        index.assertHasIgnoredTest('classes/org.gradle.ignoring.SomeIgnoredSomePassed', 'ignored')
        index.assertHasIgnoredTest('classes/org.gradle.failing.SomeIgnoredSomePassedSomeFailed', 'ignored')

                // Java types
                new DefaultType(
                        Type.JAR, Language.JAVA_FAMILY, "jar", null, false, JavaPathType.CLASSES, JavaPathType.MODULES),
                new DefaultType(Type.JAVADOC, Language.JAVA_FAMILY, "jar", "javadoc", false, JavaPathType.CLASSES),