this.includeGroups.addAll(Arrays.asList(includeGroups));
        return this;
    }

    public TestNGOptions excludeGroups(String... excludeGroups) {
        this.excludeGroups.addAll(Arrays.asList(excludeGroups));
        return this;
    }

    public TestNGOptions useDefaultListeners() {
        useDefaultListeners = true;
        return this;
    }

        testngOptions.includeGroups(groups)

        then:
        testngOptions.includeGroups == groups as Set
        testngOptions.excludeGroups.empty
    }

    def testExcludeGroups() {
        when:
        testngOptions.excludeGroups(groups)

        then:
        testngOptions.excludeGroups == groups as Set
        testngOptions.includeGroups.empty
    }

    def copyFromOverridesOldOptions() {
        given:

        this.useDefaultListener = useDefaultListener;
        this.threadPoolFactoryClass = threadPoolFactoryClass;
        this.includeGroups = includeGroups;
        this.excludeGroups = excludeGroups;
        this.listeners = listeners;
        this.configFailurePolicy = configFailurePolicy;
        this.preserveOrder = preserveOrder;
        this.groupByInstances = groupByInstances;

            }
        """

        and:
        succeeds ':test'

        then:
        executedAndNotSkipped ':test'

        where:
        property              | modification
        'excludeGroups'       | '= ["group to exclude"]'
        'includeGroups'       | '= ["group to include"]'
        'outputDirectory'     | '= file("$buildDir/my-out")'
        'suiteXmlFiles'       | '= [file("suite.xml")]'

                ngIncluded = "database"
                ngExcluded = "slow"
            }
            test {
                useTestNG {
                    includeGroups ngIncluded
                    excludeGroups ngExcluded
                }
            }
        """.stripIndent()
        file('src/test/java/org/gradle/groups/SomeTest.java') << '''
            package org.gradle.groups;

        return desc -> config.execute(new InclusiveRepositoryContentDescriptor() {
            @Override
            public void includeGroup(String group) {
                desc.excludeGroup(group);
            }

            @Override
            public void includeGroupAndSubgroups(String groupPrefix) {
                desc.excludeGroupAndSubgroups(groupPrefix);
            }