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, RubyConfUa 2010

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Ruby on Rails 4 test-driven development

http://novembermeeting.blogspot.com

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Indented test code vs

describePopularityCalculator, '#popular?'do it'should take into account \

the comment count'do

subject.popular?(post).should be_false

end

# ...

end

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Indented test code vs

classPopularityCalculator def popular?(post)

end

end

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Indented test code vs

it'should take into account the comment count'doposts = (0..19).map do |n|

post_with_comment_count n

end

posts.each do |post|

if 10 < post.comment_count

subject.popular?(post).should be_true

else

subject.popular?(post).should be_false end

end

end

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Indented test code vs

classPopularityCalculatorTHRESHOLD = 10

def popular?(post)

THRESHOLD < post.comment_count

end

end

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Indented test code vs

it'should take into account the comment count'doposts = (0..19).map do |n|

post_with_comment_count n

end

posts.each do |post|

if 10 < post.comment_count

subject.popular?(post).should be_true

else

subject.popular?(post).should be_false end

end

end

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Indented test code vs

:

(, ..)

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Indented test code vs

:

... ,

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Indented test code vs

it"should return true if the comment count /is more then the popularity threshold"do

post = post_with_comment_count THRESHOLD + 1

subject.popular?(post).should be_true

post = post_with_comment_count THRESHOLD + 100

subject.popular?(post).should be_true

end

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Indented test code vs

:

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Production Logic in Test

classPopularityCalculatorTHRESHOLD = 10

def popular?(post)

THRESHOLD < post.comment_count

end

end

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Production Logic in Test

it"should take into account the comment count"dopost = post_with_comment_count 11

expected = THRESHOLD < post.comment_count

actual = subject.popular? post

actual.should == expected

end

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Production Logic in Test

it"should take into account the comment count"dopost = post_with_comment_count 11

expected = THRESHOLD < post.comment_count

actual = subject.popular? post

actual.should == expected

end

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Production Logic in Test

:

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Production Logic in Test

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Production Logic in Test

it"should take into account the comment count"doactual = subject.popular? post_with_comment_count(11)

actual.should be_true

end

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Production Logic in Test

: , :)

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Too Many Expectations

describeNotificationService, "#notify_about"doit"should notify the post author by email"do

notification_service.notify_about @comment

end

it"should notify the post author by sms"

end

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Too Many Expectations

classNotificationService