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

        when:
        property.get()

        then:
        def e = thrown(MissingValueException)
        e.message == "Cannot query the value of ${displayName} because it has no value available."
    }

    def "toString() does not realize value"() {
        given:

        !provider.present
        provider.getOrNull() == null
        provider.getOrElse(someValue()) == someValue()

        when:
        provider.get()

        then:
        def t = thrown(MissingValueException)
        t.message == "Cannot query the value of ${displayName} because it has no value available."
    }

    def "mapped provider uses the result of transformer as its value"() {

import org.gradle.api.file.FileVisitor
import org.gradle.api.internal.file.collections.FileSystemMirroringFileTree
import org.gradle.api.internal.file.collections.MinimalFileSet
import org.gradle.api.internal.provider.MissingValueException
import org.gradle.api.internal.provider.PropertyHost
import org.gradle.api.internal.provider.Providers
import org.gradle.api.internal.tasks.TaskDependencyInternal
import org.gradle.api.provider.Provider

import org.gradle.api.internal.attributes.ImmutableAttributesFactory;
import org.gradle.api.internal.file.FileResolver;
import org.gradle.api.internal.project.ProjectInternal;
import org.gradle.api.internal.provider.MissingValueException;
import org.gradle.api.internal.tasks.TaskDependencyFactory;
import org.gradle.api.model.ObjectFactory;
import org.gradle.api.provider.Provider;
import org.gradle.api.provider.ProviderFactory;