def test()

in build_script.py [0:0]


    def test(args):
        """
        Test the built XCTest.so library at the given 'build_dir', using the
        given 'swiftc' compiler.
        """
        lit_path = os.path.abspath(args.lit)
        if not os.path.exists(lit_path):
            raise IOError(
                'Could not find lit tester tool at path: "{}". This tool is '
                'requred to run the test suite. Unless you specified a custom '
                'path to the tool using the "--lit" option, the lit tool will be '
                'found in the LLVM source tree, which is expected to be checked '
                'out in the same directory as swift-corelibs-xctest. If you do '
                'not have LLVM checked out at this path, you may follow the '
                'instructions for "Getting Sources for Swift and Related '
                'Projects" from the Swift project README in order to fix this '
                'error.'.format(lit_path))

        # FIXME: Allow these to be specified by the Swift build script.
        lit_flags = "-sv --no-progress-bar"
        tests_path = os.path.join(SOURCE_DIR, "Tests", "Functional")
        foundation_build_dir = os.path.abspath(args.foundation_build_dir)
        core_foundation_build_dir = GenericUnixStrategy.core_foundation_build_dir(
            foundation_build_dir, args.foundation_install_prefix)
        if args.libdispatch_build_dir:
            libdispatch_build_dir = os.path.abspath(args.libdispatch_build_dir)
            symlink_force(os.path.join(args.libdispatch_build_dir, "src", ".libs", "libdispatch.so"),
                foundation_build_dir)
        if args.libdispatch_src_dir and args.libdispatch_build_dir:
            libdispatch_src_args = ( 
               "LIBDISPATCH_SRC_DIR={libdispatch_src_dir} "
               "LIBDISPATCH_BUILD_DIR={libdispatch_build_dir} "
               "LIBDISPATCH_OVERLAY_DIR={libdispatch_overlay_dir}".format(
                   libdispatch_src_dir=os.path.abspath(args.libdispatch_src_dir),
                   libdispatch_build_dir=os.path.join(args.libdispatch_build_dir, 'src', '.libs'),
                   libdispatch_overlay_dir=os.path.join(args.libdispatch_build_dir, 'src', 'swift')))
        else:
            libdispatch_src_args = ""

        run('SWIFT_EXEC={swiftc} '
            'BUILT_PRODUCTS_DIR={built_products_dir} '
            'FOUNDATION_BUILT_PRODUCTS_DIR={foundation_build_dir} '
            'CORE_FOUNDATION_BUILT_PRODUCTS_DIR={core_foundation_build_dir} '
            '{libdispatch_src_args} '
            '{lit_path} {lit_flags} '
            '{tests_path}'.format(
                swiftc=os.path.abspath(args.swiftc),
                built_products_dir=args.build_dir,
                foundation_build_dir=foundation_build_dir,
                core_foundation_build_dir=core_foundation_build_dir,
                libdispatch_src_args=libdispatch_src_args,
                lit_path=lit_path,
                lit_flags=lit_flags,
                tests_path=tests_path))