},
	}, {
		desc: "no providers",
		in: &apiserver.EncryptionConfiguration{
			Resources: []apiserver.ResourceConfiguration{{
				Resources: []string{"secrets"},
			}},
		},
		want: field.ErrorList{
			field.Required(firstResourcePath.Child("providers"), fmt.Sprintf(atLeastOneRequiredErrFmt, root.Index(0).Child("providers"))),
		},
	}, {
		desc: "multiple providers",
		in: &apiserver.EncryptionConfiguration{

        providerFactory.gradleProperty('cloudServiceSecretKey') >> Providers.notDefined()
        providerFactory.gradleProperty('cloudServiceSessionToken') >> Providers.notDefined()
        providerFactory.gradleProperty('myServiceUsername') >> Providers.notDefined()
        providerFactory.gradleProperty('myServicePassword') >> Providers.notDefined()

    }

    public DefaultProperty<T> provider(Provider<? extends T> provider) {
        set(provider);
        return this;
    }

    @Override
    public void set(Provider<? extends T> provider) {
        Preconditions.checkArgument(provider != null, "Cannot set the value of a property using a null provider.");
        ProviderInternal<? extends T> p = Providers.internal(provider);

### OpenStack

SIG-OpenStack updated the OpenStack provider to use newer APIs, consolidated community code into one repository, engaged with the Cloud Provider Working Group to have a consistent plan for moving provider code into individual repositories, improved testing of provider code, and strengthened ties with the OpenStack developer community.

### API-machinery

 */

package org.gradle.util

import org.gradle.api.internal.provider.DefaultProviderFactory
import org.gradle.api.internal.provider.Providers
import org.gradle.api.provider.Provider

public class TestProviderFactory extends DefaultProviderFactory {

    @Override
    Provider<String> environmentVariable(String variableName) {
        return Providers.ofNullable(System.getenv(variableName))
    }

    @Override

        description | value
        'Provider'  | Providers.notDefined()
        'Provider in Callable'      | { -> Providers.notDefined() }
    }

    def "unpack of #description fails"() {
        when:
        DeferredUtil.unpack(value)
        then:
        thrown(MissingValueException)

        where:
        description            | value
        'Provider'             | Providers.notDefined()

** If it's a new property, expose it as a link:{javadocPath}/org/gradle/api/provider/Property.html[Property] or link:{javadocPath}/org/gradle/api/provider/Provider.html[Provider] using a single getter.
** If it's incubating, change it to use a link:{javadocPath}/org/gradle/api/provider/Property.html[Property] or link:{javadocPath}/org/gradle/api/provider/Provider.html[Provider] using a single getter.

    def "can add the same provider twice"() {
        def provider = provider("foo")

        when:
        source.addPending(provider)
        source.addPending(provider)

        then:
        source.size() == 1
        source.contains("foo")
    }

    def "an element added as both a provider and a realized value is not duplicated"() {
        when:

    }

    def "queries underlying provider for every call to get()"() {
        def provider = Stub(ProviderInternal)
        provider.type >> List
        provider.calculateValue(_) >>> [["123"], ["abc"]].collect { ValueSupplier.Value.of(it) }
        provider.calculatePresence(_) >> true

        expect:
        property.set(provider)
        assertValueIs(["123"])
        assertValueIs(["abc"])

    private static final Comparator<Provider> PROVIDER_COMPARATOR = new Comparator<Provider>() {
        @Override
        public int compare(Provider o1, Provider o2) {
            return o1.getPath().compareTo(o2.getPath());
        }
    };

    private final String referenceType;
    private final String referenceDescription;
    private final List<Provider> providers;

    public static class Provider {