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|
Feature: Receive Counts
When [expecting a message](../basics/expecting-messages), you can specify how many times you expect the message to be
received:
* `expect(...).to receive(...).once`
* `expect(...).to receive(...).twice`
* `expect(...).to receive(...).exactly(n).time`
* `expect(...).to receive(...).exactly(n).times`
* `expect(...).to receive(...).at_least(:once)`
* `expect(...).to receive(...).at_least(:twice)`
* `expect(...).to receive(...).at_least(n).time`
* `expect(...).to receive(...).at_least(n).times`
* `expect(...).to receive(...).at_most(:once)`
* `expect(...).to receive(...).at_most(:twice)`
* `expect(...).to receive(...).at_most(n).time`
* `expect(...).to receive(...).at_most(n).times`
If you don't specify an expected receive count, it defaults to `once`.
Background:
Given a file named "lib/account.rb" with:
"""ruby
class Account
def initialize(logger)
@logger = logger
end
def open
@logger.account_opened
end
end
"""
Scenario: Passing examples
Given a file named "spec/account_spec.rb" with:
"""ruby
require 'account'
RSpec.describe Account do
let(:logger) { double("Logger") }
let(:account) { Account.new(logger) }
example "once" do
expect(logger).to receive(:account_opened).once
account.open
end
example "twice" do
expect(logger).to receive(:account_opened).twice
account.open
account.open
end
example "exactly(n).time" do
expect(logger).to receive(:account_opened).exactly(1).time
account.open
end
example "exactly(n).times" do
expect(logger).to receive(:account_opened).exactly(3).times
account.open
account.open
account.open
end
example "at_least(:once)" do
expect(logger).to receive(:account_opened).at_least(:once)
account.open
account.open
end
example "at_least(:twice)" do
expect(logger).to receive(:account_opened).at_least(:twice)
account.open
account.open
account.open
end
example "at_least(n).time" do
expect(logger).to receive(:account_opened).at_least(1).time
account.open
end
example "at_least(n).times" do
expect(logger).to receive(:account_opened).at_least(3).times
account.open
account.open
account.open
account.open
end
example "at_most(:once)" do
expect(logger).to receive(:account_opened).at_most(:once)
end
example "at_most(:twice)" do
expect(logger).to receive(:account_opened).at_most(:twice)
account.open
end
example "at_most(n).time" do
expect(logger).to receive(:account_opened).at_most(1).time
account.open
end
example "at_most(n).times" do
expect(logger).to receive(:account_opened).at_most(3).times
account.open
account.open
end
end
"""
When I run `rspec spec/account_spec.rb`
Then the examples should all pass
Scenario: Failing examples
Given a file named "spec/account_spec.rb" with:
"""ruby
require 'account'
RSpec.describe Account do
let(:logger) { double("Logger") }
let(:account) { Account.new(logger) }
example "once" do
expect(logger).to receive(:account_opened).once
account.open
account.open
end
example "twice" do
expect(logger).to receive(:account_opened).twice
account.open
end
example "exactly(n).times" do
expect(logger).to receive(:account_opened).exactly(3).times
account.open
account.open
end
example "at_least(:once)" do
expect(logger).to receive(:account_opened).at_least(:once)
end
example "at_least(:twice)" do
expect(logger).to receive(:account_opened).at_least(:twice)
account.open
end
example "at_least(n).times" do
expect(logger).to receive(:account_opened).at_least(3).times
account.open
account.open
end
example "at_most(:once)" do
expect(logger).to receive(:account_opened).at_most(:once)
account.open
account.open
end
example "at_most(:twice)" do
expect(logger).to receive(:account_opened).at_most(:twice)
account.open
account.open
account.open
end
example "at_most(n).times" do
expect(logger).to receive(:account_opened).at_most(3).times
account.open
account.open
account.open
account.open
end
end
"""
When I run `rspec spec/account_spec.rb --order defined`
Then the examples should all fail, producing the following output:
| expected: 1 time with any arguments |
| received: 2 times |
| |
| expected: 2 times with any arguments |
| received: 1 time with any arguments |
| |
| expected: 3 times with any arguments |
| received: 2 times with any arguments |
| |
| expected: at least 1 time with any arguments |
| received: 0 times with any arguments |
| |
| expected: at least 2 times with any arguments |
| received: 1 time with any arguments |
| |
| expected: at least 3 times with any arguments |
| received: 2 times with any arguments |
| |
| expected: at most 1 time with any arguments |
| received: 2 times |
| |
| expected: at most 2 times with any arguments |
| received: 3 times |
| |
| expected: at most 3 times with any arguments |
| received: 4 times |
|
