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Contents
Feature: Expect change
Expect some code (wrapped in a proc) to change the state of some object.
Scenario: expecting change
Given a file named "expect_change_spec.rb" with:
"""
class Counter
class << self
def increment
@count ||= 0
@count += 1
end
def count
@count ||= 0
end
end
end
describe Counter, "#increment" do
it "should increment the count" do
expect{Counter.increment}.to change{Counter.count}.from(0).to(1)
end
# deliberate failure
it "should increment the count by 2" do
expect{Counter.increment}.to change{Counter.count}.by(2)
end
end
"""
When I run "rspec ./expect_change_spec.rb"
Then the output should contain "2 examples, 1 failure"
Then the output should contain "should have been changed by 2, but was changed by 1"
Scenario: expecting no change
Given a file named "expect_no_change_spec.rb" with:
"""
class Counter
class << self
def increment
@count ||= 0
@count += 1
end
def count
@count ||= 0
end
end
end
describe Counter, "#increment" do
it "should not increment the count by 2" do
expect{Counter.increment}.to_not change{Counter.count}.from(0).to(2)
end
# deliberate failure
it "should not increment the count by 1" do
expect{Counter.increment}.to_not change{Counter.count}.by(1)
end
end
"""
When I run "rspec ./expect_no_change_spec.rb"
Then the output should contain "2 examples, 1 failure"
Then the output should contain "should not have changed, but did change from 1 to 2"
Version data entries
23 entries across 23 versions & 3 rubygems