preview of cli tool from js chap #1520

Job	Run time
chapter-tests (test_chapter_01)	10s
chapter-tests (test_chapter_02_unittest)	11s
chapter-tests (test_chapter_03_unit_test_first_view)	11s
chapter-tests (test_chapter_04_philosophy_and_refactoring)	13s
chapter-tests (test_chapter_05_post_and_database)	11s
chapter-tests (test_chapter_06_explicit_waits_1)	10s
chapter-tests (test_chapter_07_working_incrementally)	10s
chapter-tests (test_chapter_08_prettification)	11s
chapter-tests (test_chapter_09_docker)	11s
chapter-tests (test_chapter_10_production_readiness)	14s
chapter-tests (test_chapter_11_server_prep)	13s
chapter-tests (test_chapter_12_ansible)	11s
chapter-tests (test_chapter_13_organising_test_files)	13s
chapter-tests (test_chapter_14_database_layer_validation)	10s
chapter-tests (test_chapter_15_simple_form)	11s
chapter-tests (test_chapter_16_advanced_forms)	11s
chapter-tests (test_chapter_17_javascript)	10s
chapter-tests (test_chapter_19_spiking_custom_auth)	10s
chapter-tests (test_chapter_20_mocking_1)	14s
chapter-tests (test_chapter_21_mocking_2)	13s
chapter-tests (test_chapter_22_fixtures_and_wait_decorator)	14s
chapter-tests (test_chapter_23_debugging_prod)	11s
chapter-tests (test_chapter_24_outside_in)	11s
chapter-tests (test_chapter_25_CI)	11s
chapter-tests (test_chapter_26_page_pattern)	10s
	4m 45s

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