}

    public AbstractBuildOption(String property, V... commandLineOptionConfiguration) {
        this(property, null, commandLineOptionConfiguration != null ? Arrays.asList(commandLineOptionConfiguration) : Collections.<V>emptyList());
    }

    private AbstractBuildOption(String property, String deprecatedProperty, List<V> commandLineOptionConfigurations) {
        this.property = property;
        this.deprecatedProperty = deprecatedProperty;

            tasks.create("thing", MyTask) {
                println("property = \$count")
                count = 12
            }
        """

        when:
        succeeds("thing")

        then:
        outputContains("property = task ':thing' property 'count'")
        outputContains("count = 12")
    }

    def "reports failure to query managed Property<T> with no value"() {
        given:
        buildFile << """

        "System.properties['some.property']"                   | _
        "System.getProperties().get('some.property')"          | _
        "getProperties().get('some.property')"                 | _
        "System.getProperty('some.property')"                  | _
        "getProperty('some.property')"                         | _
        "System.getProperty('some.property', 'default.value')" | _
        "getProperty('some.property', 'default.value')"        | _

        "System.getProperties().get(\"some.property\")"            | _
        "System.getProperty(\"some.property\")"                    | _
        "System.getProperty(\"some.property\", \"default.value\")" | _
        "System.setProperty(\"some.property\", \"new.value\")"     | _
        "System.clearProperty(\"some.property\")"                  | _
    }

    def "setProperties is instrumented in Java"() {

        when:
        configurationCacheRun("-Dsome.property.1=1", "-Dsome.property.2=2", "print")

        then:
        configurationCache.assertStateStored()
        outputContains("Configuration: some.property.1 = 0")
        outputContains("Configuration: some.property.2 = 2")

        when:
        configurationCacheRun("-Dsome.property.1=-1", "-Dsome.property.2=2", "print")

        then:

    /**
     * Adds an element to the property value.
     *
     * <p>The given provider will be queried when the value of this property is queried.
     *
     * <p>
     * When invoked on a property with no value, this method first sets the value
     * of the property to its current convention value, if set, or an empty collection.
     * </p>
     * <p>Even if the given provider has no value, after this method is invoked,

        "${Property.name}<String>"            | "objects.property(String); v.set('abc')"              | "objects.property(String); v.set('123')"                     | "Type 'SomeTask': property 'v' of mutable type 'org.gradle.api.provider.Property' is writable. Properties of type 'org.gradle.api.provider.Property' are already mutable. Possible solution: Remove the 'setV' method. ${learnAt("validation_problems",...

        .filter { property ->
            (includeMemberFilter.shouldIncludeMember(property) ||
                kClass.primaryConstructor?.parameters.orEmpty().any { it.name == property.name && it.type == property.returnType })
                && property.visibility == KVisibility.PUBLIC
                && propertyNamePredicate(property.name)
        }.map { property -> kPropertyInformation(property) }

    private

The value of this property is derived from:
  - extension 'custom2' property 'source'
  - extension 'custom1' property 'source'""")
    }

    def "can use property with no value as optional ad hoc task input property"() {
        given:
        buildFile << """

def prop = project.objects.property(String)

task thing {

Method <org.gradle.api.artifacts.DependencyArtifact.getExtension()> does not have raw return type assignable to org.gradle.api.provider.Property in (DependencyArtifact.java:0)
Method <org.gradle.api.artifacts.DependencyArtifact.getName()> does not have raw return type assignable to org.gradle.api.provider.Property in (DependencyArtifact.java:0)