def "supplies no installations for absent output"() {
        given:
        def supplier = new OsXInstallationSupplier(OperatingSystem.MAC_OS, osxJavaHomeCommand)
        osxJavaHomeCommand.findJavaHomes() >> []

        when:
        def directories = supplier.get()

        then:
        directories.isEmpty()
    }


    def "supplies no installations for wrong os"() {
        given:

 * limitations under the License.
 */

package org.gradle.jvm.toolchain.internal;

import java.io.File;
import java.util.Set;

public interface OsXJavaHomeCommand {
    Set<File> findJavaHomes();

    public String getSourceName() {
        return "MacOS java_home";
    }

    @Override
    public Set<InstallationLocation> get() {
        if (os.isMacOsX()) {
            return javaHomeCommand.findJavaHomes().stream().map(this::asInstallation).collect(Collectors.toSet());
        }
        return Collections.emptySet();
    }

    private InstallationLocation asInstallation(File javaHome) {

                return Stream.of(javaHome);
            }
            return Stream.empty();
        }).map(File::new).collect(Collectors.toSet());
    }

    @Override
    public Set<File> findJavaHomes() {
        try {
            final Reader output = executeJavaHome();
            return parse(output);
        } catch (ExecException e) {

            @Override
            protected void executeCommand(ByteArrayOutputStream outputStream) {
                throw new ExecException("command failed")
            }
        }
        expect:
        parser.findJavaHomes().isEmpty()
    }