given:
        def property = property()
        property.set(someValue())
        property.set((Iterable) null)

        expect:
        !property.present
        property.getOrNull() == null
        property.getOrElse(someValue()) == someValue()
        property.getOrElse(null) == null
    }

    def "can set null value to remove any added values"() {
        property.add("abc")

        given:
        property.set(notDefined())
        and:
        property.put('k1', 'v1')
        property.put('k2', Providers.of('v2'))
        property.putAll(['k3': 'v3'])
        property.putAll(Providers.of(['k4': 'v4']))

        expect:
        !property.present
        property.getOrNull() == null
        property.getOrElse(['kk': 'vv']) == ['kk': 'vv']

        when:
        property.get()
        then:

        property.get() == someValue()

        property.set(someOtherValue())
        property.present
        property.get() == someOtherValue()
    }

    def "can use null convention value"() {
        def property = propertyWithNoValue()
        assert property.getOrNull() != someValue()

        expect:
        nullConvention(property)

        !property.present
        property.getOrNull() == null

    }

    private static boolean isNameProperty(PropertyMetadata property) {
        // Property is read only, called "name", has type String and getter is abstract
        return property.isReadOnly() && "name".equals(property.getName()) && property.getType() == String.class && property.getMainGetter().isAbstract();
    }

    private static boolean hasPropertyType(PropertyMetadata property) {

<2> Reads the value from the project extra property we created — note the `project.` qualifier on `extra[...]`, otherwise Gradle will assume we want to read an extra property from the _task_

// === `Property`, `Provider` and `NamedDomainObjectProvider`


[[kotdsl:assignment]]
== Kotlin lazy property assignment

`testLogging` — default: _not set_::
This property represents a set of options that control which test events are logged and at what level. You can also configure other logging behavior via this property. See link:{javadocPath}/org/gradle/api/tasks/testing/logging/TestLoggingContainer.html[TestLoggingContainer] for more detail.

`dryRun` — default: false::

        failureDescriptionContains("- Type 'Consumer' property 'counter' doesn't have a configured value.")
        failureDescriptionContains("Reason: This property isn't marked as optional and no value has been configured.")
    }

    def "injection by name does not fail validation if service is not found but property marked as @Optional"() {
        given:
        serviceImplementation()

 ** `PropertyState`
 ** `DirectoryVar`
 ** `RegularFileVar`
 ** `ProjectLayout.newDirectoryVar()`
 ** `ProjectLayout.newFileVar()`
 ** `Project.property(Class)`
 ** `Script.property(Class)`
 ** `ProviderFactory.property(Class)`

====

Annotations are inherited from all parent types including implemented interfaces. Property type annotations override any other property type annotation declared in a parent type. This way an `@InputFile` property can be turned into an `@InputDirectory` property in a child task type.

    }

    @Override
    public void setStatus(Object s) {
        getInternalStatus().set(s);
    }

    @Override
    public Property<Object> getInternalStatus() {
        if (status == null) {
            status = getObjects().property(Object.class).convention(DEFAULT_STATUS);
        }
        return status;
    }

    @Override
    public Map<String, Project> getChildProjectsUnchecked() {