*
     * @param pkg The target package.
     * @return this
     */
    TestSpec includePackage(String pkg);

    /**
     * Adds all tests declared in the target packages to the test execution.
     *
     * @see #includePackage(String)
     * @param packages The target packages.
     * @return this
     */
    TestSpec includePackages(Collection<String> packages);

    /**

    def "can select package"() {
        setup:
        when:
        launchTests { TestLauncher launcher ->
            launcher.withTestsFor { TestSpecs specs ->
                specs.forTaskPath(':secondTest').includePackage('example2')
            }
        }

        then:
        events.testClassesAndMethods.size() == 4
        assertTestExecuted(className: 'example2.MyOtherTest', methodName: 'bar', task: ':secondTest')

        when:
        launchTests { TestLauncher launcher ->
            launcher.withArguments("--configuration-cache")
            launcher.withTestsFor { TestSpecs specs ->
                specs.forTaskPath(':secondTest').includePackage('example2')
            }
        }

        then:
        // 2 test class + 2 test method events
        events.testClassesAndMethods.size() == 4

        this.classes = classes;
        this.methods = methods;
        this.patterns = patterns;
    }

    @Override
    public TestSpec includePackage(String pkg) {
        return includePackages(Collections.singletonList(pkg));
    }

    @Override
    public TestSpec includePackages(Collection<String> packages) {
        this.packages.addAll(packages);
        return this;
    }

    @Override

     * <pre>
     *     TestLauncher testLauncher = projectConnection.newTestLauncher();
     *     testLauncher.withTestsFor(spec -&gt; {
     *         spec.forTaskPath(":test")
     *             .includePackage("org.pkg")
     *             .includeClass("com.TestClass")
     *             .includeMethod("com.TestClass")
     *             .includePattern("io.*")
     *     }).run();
     * </pre>
     *