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

        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")

    }

    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) {

Method <org.gradle.api.plugins.antlr.AntlrTask.getMaxHeapSize()> does not have raw return type assignable to org.gradle.api.provider.Property in (AntlrTask.java:0)
Method <org.gradle.api.plugins.antlr.AntlrTask.getOutputDirectory()> does not have raw return type assignable to org.gradle.api.provider.Property in (AntlrTask.java:0)

    <profiles>
        <profile>
            <id>profile-1</id>
            <activation>
                <property>
                    <name>!someProperty</name>
                </property>
            </activation>
            <properties>
                <some.group>group-one</some.group>
                <some.artifact>artifact-one</some.artifact>
                <some.version>version-one</some.version>

 *
 * </ul>
 *
 * <p>When reading a property, the project searches the above scopes in order, and returns the value from the first
 * scope it finds the property in. If not found, an exception is thrown. See {@link #property(String)} for more details.</p>
 *
 * <p>When writing a property, the project searches the above scopes in order, and sets the property in the first scope

        then:
        pomReader.getDependencies().size() == 1
        assertResolvedPomDependency(key, 'version-three')
    }

    def "cannot use POM property to control profile property activation"() {
        setup:
        String customPropertyName = new UUIDGenerator().generateId()
        System.properties[customPropertyName] = 'BLUE'

        when:
        pomFile << """

        WeaklyTypeReferencingMethod<?, ?> weakSetter = property.getAccessor(SETTER);
        // There is no setter for this property
        if (weakSetter == null) {
            return;
        }
        if (!(property.getSchema() instanceof ScalarValueSchema)) {
            return;
        }

        Class<?> propertyClass = property.getType().getConcreteClass();

        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()