Fast, Sexy, and Svelte: Our Kind of Rails Testing. Dan Manges (ThoughtWorks) zak (unemployed)
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1 Fast, Sexy, and Svelte: Our Kind of Rails Testing Dan Manges (ThoughtWorks) zak (unemployed)
2 a translation without buzzwords
3 notes short build times maintainable comprehensive coverage this talk: how to achieve these three things
4 what this talk is not about
5 notes selling you on tests if you haven t bought into the value of testing, prepare to be very bored
6 the testing spectrum unit functional integration denial acceptance
7 what s a unit test?
8 notes!! fine grained!! focused on one object!! provides the most accurate feedback!! fails fastest!! only one object / method under test per test method
9 avoiding unit test brittleness
10 gem install unit_record
11 not hitting a database is fast
12 let s look at a super simple test
13
14 we could write a fixture
15
16
17 fixtureless unit tests
18
19 notes!! focused tests don t require a dataset!! fixtures are less clear
20 unit tests are for any class
21 unit tests for controllers
22 notes!! reduce dependency on models "! mock or stub models "! stub view rendering (UnitController) "! don t hit the database (UnitRecord) "! don t depend on model validations
23
24
25
26
27 gem install unit_controller
28 unit testing views (yum)
29 notes!! don t bother "! laborious "! really brittle!! views aren t objects!! move view logic to presenters or helpers
30 unit tests the old & new way unit tests are for models unit tests are for any class use fixtures for data focused tests don t need fixtures hit the database disconnected from the database
31 what s a functional test?
32 notes!! coarser grained than unit tests!! involves more than one object!! involves several methods!! fails at an interaction level
33 functional tests require data
34 problems with fixtures
35 notes!! polluted sharing!! laborious to create and maintain!! creating associations!! setting attributes your test doesn t care about!! doesn t run validations
36 model factory
37 notes!! factory method pattern!! creating data dynamically instead of statically in files!! no sharing pollution!! runs validations
38
39 getting a good factory
40 notes!! build it yourself!! provide reasonable defaults!! fill in associations
41 creating a factory
42 functional tests are also for any class
43 notes!! interactions between models!! interesting database interactions!! interactions between controller and model!! interactions between controller and view*
44 interesting database interactions
45 interaction between controller and view*
46 notes!! why the asterisk?!! don t test the content of the view*!! test that it renders successfully!! we ll test its content in acceptance tests
47 functional testing speed
48
49 functional tests in serial real time: 9 min sec
50 rake task for serial tests
51 deeptest
52 deeptest for RSpec
53 Functional Tests in Parallel!! real time: 6 min sec!! 33% faster
54 DeepTest & The Database
55 functional tests distributed real time: 2 min sec 5 times faster than serial
56 DeepTest gem install deep_test
57 functional tests the old & new way fixtures for data factory for data functional tests are for controllers functional tests are for any class tests are run in serial tests are run in parallel
58 what about integration tests?
59 traditional integration tests
60 Integration Tests the New Way!! sometimes useful for special purpose tests "! performance tests "! smoke tests "! tests simulating multiple users!! acceptance tests are better for this level of granularity
61 what s an acceptance test?
62 Selenium RC
63 writing acceptance tests
64 encapsulating a page
65 hide low-level details of page structure
66 data access
67 notes!! direct database access!! use the same factory as functional tests!! datasets "! difficult to maintain "! make tests less clear "! difficult to isolate test failures
68 focused acceptance tests
69 notes!! hack the session "! skip the login page "! skip to part way through a wizard
70 acceptance test parallelization
71 notes!! Selenium Grid!! DeepTest!! web & database cluster
72
73 test parallelization in general
74 hey it's Rails. it scales with hardware. and so do the tests
75 The End!! Dan s Blog: dcmanges.com!! Something Nimble: somethingnimble.com!! Tools: "! deep test "! selenium grid "! unit record "! unit controller
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