Minitest & Rails, No Pony Ryan Davis, Seattle.rb Min est ... · Windy City Rails, Chicago, IL...
Transcript of Minitest & Rails, No Pony Ryan Davis, Seattle.rb Min est ... · Windy City Rails, Chicago, IL...
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Min!est& Rails,No Pony
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Setting Expectations93 Slides in 30 minutes. ~3 spm.
Overview talk.
Not comparison nor comprehensive.
Less Technical than my norm.
http://www.zenspider.com/presentations/
TODO
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What I'm not talking about
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minitestvs
rspec
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tddvs
bdd
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state-istvs
mockist
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I do all of the former.
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As long as you test…
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I do not care what you use or how you
use it
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Also not about benchmark, pride, or
mock.
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I could easily talk for hours on minitest &
testing
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I only have 30 minutes.
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Grab me [email protected]
@the_zenspider
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Min!est
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What is Minitest?Replacement for ruby 1.8’s test/unit.
Originally 90 lines of code.
Available as a gem, and in ruby 1.9 & 2.0.
Meant to be small, clean, and very fast.
Provides a lot more than test/unit did.
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6 3 Parts of Minitestrunner The heart of the machineminitest/unit TDD APIminitest/spec BDD API minitest/mock Simple mocking/stubbing APIminitest/pride IO pipelining exampleminitest/bench Abstract benchmark API
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Min!est Runner
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Every method starting with "test" is run in a
new context.
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No Magic AllowedEven test discovery avoids ObjectSpace.
Minimal metaprogramming.
Uses plain classes and methods to do all work.
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Test randomization prevents order dependencies.
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Verbose mode prints test times in a sortable format:
% ruby -Ilib test/test_meta.rb -v | sort -k2 -t= -nr | head -3
MetaMagic#test_generate_meta_method = 0.03 s = . MetaMagic#test_complex_method = 0.02 s = .MetaMagic#test_simple_method = 0.01 s = .
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Test summary provides useful statistics:
# Running tests:
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Finished tests in 0.510616s, 1339.5585 tests/s, 7428.2827 assertions/s.
684 tests, 3793 assertions, 0 failures, 0 errors, 0 skips
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min!est/un!
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Test Example
Magic Free!
Simple Subclass
Simple Method
require "minitest/autorun"
class TestThingy < MiniTest::Unit::TestCase def test_do_the_thing assert_equal 42, Thingy.do_the_thing endend
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assertions
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Positive Assertionsassertassert_blockassert_emptyassert_equalassert_in_deltaassert_in_epsilonassert_includesassert_instance_ofassert_kind_ofassert_match
assert_nilassert_operatorassert_outputassert_raisesassert_respond_toassert_sameassert_sendassert_silentassert_throws
Bold = new
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assert_equal diffs: 1) Failure:test_failing_simple(TestSimple) [example.rb:8]:Expected: 42 Actual: 24
2) Failure:test_failing_complex(TestComplex) [example.rb:23]:--- expected+++ actual@@ -22,7 +22,7 @@ "line 22", "line 23", "line 24",- "line 25",+ "something unexpected", "line 26", "line 27", "line 28",
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Negative Assertionsrefuterefute_emptyrefute_equalrefute_in_deltarefute_in_epsilonrefute_includesrefute_instance_of
refute_kind_ofrefute_matchrefute_nilrefute_operatorrefute_respond_torefute_same
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Utility Methodspassskipcapture_io
flunkmu_ppmu_pp_for_diff
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assert ! obj refute obj
assert collection.include? obj assert_include obj, collection
out, err = capture_io do do_somethingendassert_equal "output", outassert_equal "", err
assert_output "output", "" do do_somethingend
Why all these extra assertions?They're more expressive!
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min!est/"ec
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Spec Examplerequire "minitest/autorun"
describe Thingy do it "must do the thing" do Thingy.do_the_thing.must_equal 42 endend
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Specs Transform:
Magic Free!
Simple Subclass
Simple Method
require "minitest/autorun"
class TestThingy < MiniTest::Unit::TestCase def test_0001_must_do_the_thing Thingy.do_the_thing.must_equal 42 endend
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positive expectationsmust_bemust_be_close_tomust_be_emptymust_be_instance_ofmust_be_kind_ofmust_be_nilmust_be_same_asmust_be_silentmust_be_within_delta
must_be_within_epsilonmust_equalmust_includemust_matchmust_outputmust_raisemust_respond_tomust_sendmust_throw
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negative expectationswont_bewont_be_close_towont_be_emptywont_be_instance_ofwont_be_kind_ofwont_be_nilwont_be_same_as
wont_be_within_deltawont_be_within_epsilonwont_equalwont_includewont_matchwont_respond_to
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All for Freemust_equal is assert_equalwont_equal is refute_equal
etc.
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Extending
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minitest/unitdef assert_palindrome obj assert_equal obj, obj.reverseend
assert_palindrome @ary
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minitest/specdef must_be_palindrome self.must_equal self.reverseend
# or:
infect_an_assertion(:assert_palindrome, :must_be_palindrome)
@ary.must_be_palindrome
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Other Examplesassert_path_exists pathrefute_path_exists path
path.must_exist_as_path
assert_satisfied_by version, specifier
assert_dependencies expected, *specs
assert_reachable node, graph
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minitest pluginscapybara_minitest_specminispec-metadataminitest-ansiminitest-aroundminitest-capistranominitest-capybaraminitest-chef-handlerminitest-ciminitest-colorizeminitest-contextminitest-debuggerminitest-displayminitest-emojiminitest-englishminitest-excludesminitest-filesystemminitest-firemock
minitest-great_expectationsminitest-growlminitest-implicit-subjectminitest-instrumentminitest-instrument-dbminitest-libnotifyminitest-lineminitest-macrubyminitest-matchersminitest-metadataminitest-mongoidminitest-must_notminitest-ncminitest-predicatesminitest-railsminitest-rails-capybaraminitest-reporters
minitest-should_syntaxminitest-shouldifyminitest-spec-contextminitest-spec-expectminitest-spec-magicminitest-spec-railsminitest-stub-constminitest-tagsminitest-wscolorminitest_owrapperminitest_shouldminitest_tu_shimmongoid-minitestpry-rescue
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Min!est Design Ra#onale
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Less is More
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Indirection is the Enemy
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
minitest/unit:assert_in_delta
Only 2 other methods need to be understood:assert (9) & message (6)
simple assertion is all that is needed
message takes a block to defer
calculation until an assertion fails
def assert_in_delta exp, act, delta = 0.001, msg = nil n = (exp - act).abs msg = message(msg) { "Expected #{exp} - #{act} (#{n}) to be < #{delta}" } assert delta >= n, msgend
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
minitest/spec:n.must_be_close_to m
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Turn up the test levels
Randomize Test Order
Require Proof of Success?
Fast
Test
Runn
er
Forced Parallelization
01
2
3
45
6 78
9
1011
Disallow meaningless assertions
???
test + spec
Benchmark TestsUse gem, not stdlib
Writ
e cu
stom
ass
ertio
ns
Refac
tor to
reus
able
testca
ses
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
min!est 4vs
min!est 5Friday, September 13, 13
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Architecture MT4
MiniTest::Unit::Guard
MiniTest::Assertions
MiniTest::Expectations
MiniTest::Unit::TestCase
MiniTest::Spec::DSL
MiniTest::Unit::LifecycleHooks
MiniTest::Unit
MiniTest::Spec
MiniTest
MiniTest::Assertion MiniTest::PrideIO
MiniTest::PrideLOLMiniTest::Skip
Minitest::BacktraceFilter Minitest::ParallelEach Minitest::Mock
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Minitest
Architecture MT5
Minitest::Reporter Minitest::Assertion
Minitest::BacktraceFilter Minitest::ParallelEach
Minitest::PrideIO
Minitest::PrideLOLMinitest::Skip Minitest::UnexpectedErrorMinitest::CompositeReporter
Minitest::Mock
Minitest::Runnable
Minitest::Guard
Minitest::Assertions
Minitest::Expectations
Minitest::Test
Minitest::Benchmark Minitest::Spec::DSL
Minitest::Test::LifecycleHooks
Minitest::BenchSpec
Minitest::Spec
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
MiniTest
Minitest
MiniTest::Unit
Minitest::Runnable
Minitest::Guard
Minitest::Assertions
Minitest::Expectations
Minitest::Test
Minitest::Benchmark Minitest::Spec::DSL
Minitest::Test::LifecycleHooks
Minitest::BenchSpec
Minitest::Spec
Minitest::Reporter Minitest::Assertion
Minitest::BacktraceFilter Minitest::ParallelEach
Minitest::PrideIO
Minitest::PrideLOLMinitest::Skip Minitest::UnexpectedErrorMinitest::CompositeReporter
Minitest::Mock
Differences
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Reporter Enhancements
hasmany
AbstractReporter
Reporter CompositeReporter
ProgressReporter StatisticsReporter
SummaryReporter
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Cal
l Flo
w M
T4
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Cal
l Flo
w M
T4
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Cal
l Flo
w M
T5N
o Managers!
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
User-Level Changess/MiniTest/Minitest/gs/Unit::TestCase/Test/g
Assertions?No changes!
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Rails
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
A$%eSupport::TestCase
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Minitest::Test
ActiveSupport::TestCase
MyThingyTest
Basic Architecture
Friday, September 13, 13
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Per-test database transactions
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Fixtures
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Assertionsassert_notassert_blank → assert_predicate/must_beassert_presentassert_differenceassert_no_differenceassert_deprecatedassert_not_deprecated
Friday, September 13, 13
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Declarative Formssetup do # ...end
teardown do # ...end
test “test name” do # ...end
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
test/horse_test.rbrequire 'test_helper'
class HorseTest < ActiveSupport::TestCase def trigger @trigger ||= Horse.new name: "Trigger Rogers" end
def test_name assert_equal "Trigger Rogers", trigger.name end
def test_friendship assert_equal "magic", trigger.friendship endend
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
A$ionController::TestCase
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Basic ArchitectureMinitest::Test
ActiveSupport::TestCase
MyControllerTest
ActionController::TestCase
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Actionsget
post
delete
etc
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Staterequest
response
session
flash
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Assertionsassert_response
assert_redirected_to
assert_template
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Examplerequire "test_helper"
class CupcakesControllerTest < ActionController::TestCase def test_index get :index assert_response :success assert_match(/horses/i, response.body) end
def test_show get :show, id: cupcakes(:sprinkle) assert_response :success endend
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
A$ionView::TestCase
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Minitest::Test
ActiveSupport::TestCase
MyHelperTest
ActionView::TestCase lots of modules
Architecture
Friday, September 13, 13
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module CupcakesHelper def cupcake_image_tag cupcake image_tag cupcake.image_url, alt: cupcake.name endend
app/helpers/cupcakes_helper.rb
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
require 'test_helper'
class CupcakesHelperTest < ActionView::TestCase def setup @cupcake = Cupcake.new name: "Icy McIcerson", image_url: "http://i.imgur.com/mbWH1gM.png" end
def test_cupcake_image_tag image_tag_html = cupcake_image_tag @cupcake assert_match "alt=\"#{@cupcake.name}\"", image_tag_html assert_match "src=\"#{@cupcake.image_url}\"", image_tag_html endend
test/helpers/cupcakes_helper_test.rb
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
A$%eDi"at&::Integra#onTest
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Minitest::Test
ActiveSupport::TestCase
MyIntegrationTest
ActionDispatch::IntegrationTest
Architecture
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Assertions
TonsFriday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Exampleclass SmokedMeatheadTest < ActionDispatch::IntegrationTest def test_login get "/sign_in" assert_response :success
post_via_redirect("/sign_in", "athlete" => {"email" => "email", "password" => "password", "remember_me" => "0"}) assert_response :success assert_equal "/", path
get "/visualize/graph" assert_response :success assert assigns(:exercise_data) endend
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Rails 4.0uses
Minitest 4
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Rails 4.1uses
Minitest 5
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Rails & Specs
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
min!est-rails
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
rails 4 originally used minitest/spec
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
DHH didn't like it
Friday, September 13, 13
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require "minitest/rails"
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Eat your heart out DHHdescribe CupcakesController do it 'shows a list of cupcakes' do get :index assert_response :success end
it 'shows a cupcake' do get :show, id: cupcakes(:sprinkle) assert_response :success endend
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
min!est-rails-capybara
Friday, September 13, 13
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Ryan Davis, Seattle.rbMinitest & Rails, No Pony
No Problem…feature "Login Feature" do given(:trigger_password) { "triggerrogers" } given(:trigger) { p = horses :trigger ... }
scenario "logging in as Trigger Rogers" do visit root_path
refute_nav_links_logged_in
click_link "login"
fill_in "Email", with: trigger.email fill_in "Password", with: trigger_password click_button "Sign in"
assert_nav_links_logged_in trigger endend
Friday, September 13, 13
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
However you test…
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
Minitest has you covered
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
and then some…
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No Pony
'ank You
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Windy City Rails, Chicago, IL
Ryan Davis, Seattle.rbMinitest & Rails, No PonyI lied!
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