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module YieldHelpers
# these helpers are prefixed with an underscore to prevent
# collisions with the matchers (some of which have the same names)
def _dont_yield
end
def _yield_with_no_args
yield
end
def _yield_with_args(*args)
yield(*args)
end
end
class InstanceEvaler
def yield_with_no_args(&block)
instance_exec(&block)
end
def yield_with_args(*args, &block)
instance_exec(*args, &block)
end
def each_arg(*args, &block)
args.each do |arg|
instance_exec(arg, &block)
end
end
end
# NOTE: `yield` passes a probe to expect an that probe should be passed
# to expectation target. This is different from the other block matchers.
# Due to strict requirement in Ruby 1.8 to call a block with arguments if
# the block is declared to accept them. To work around this limitation,
# this example group overrides the default definition of expectations
# and lambdas that take the expectation target in a way that they accept
# a probe.
RSpec.shared_examples "an RSpec probe-yielding block-only matcher" do |*options|
include_examples "an RSpec block-only matcher", { :expects_lambda => true }.merge(options.first || {}) do
let(:valid_expectation) { expect { |block| valid_block(&block) } }
let(:invalid_expectation) { expect { |block| invalid_block(&block) } }
let(:valid_block_lambda) { lambda { |block| valid_block(&block) } }
let(:invalid_block_lambda) { lambda { |block| invalid_block(&block) } }
end
end
RSpec.describe "yield_control matcher" do
include YieldHelpers
extend YieldHelpers
it_behaves_like "an RSpec probe-yielding block-only matcher",
:failure_message_uses_no_inspect => true do
let(:matcher) { yield_control }
def valid_block(&block)
_yield_with_no_args(&block)
end
def invalid_block(&block)
_dont_yield(&block)
end
end
it 'has a description' do
expect(yield_control.description).to eq("yield control")
end
describe "expect {...}.to yield_control" do
it 'passes if the block yields, regardless of the number of yielded arguments or the number of yields' do
expect { |b| _yield_with_no_args(&b) }.to yield_control
expect { |b| _yield_with_args(1, 2, &b) }.to yield_control
expect { |b| 1.upto(10, &b) }.to yield_control
end
it 'passes if the block yields using instance_exec' do
expect { |b| InstanceEvaler.new.yield_with_no_args(&b) }.to yield_control
end
it 'fails if the block does not yield' do
expect {
expect { |b| _dont_yield(&b) }.to yield_control
}.to fail_with(/expected given block to yield control but/)
end
it 'fails if the block does not yield the correct number of times' do
expect {
expect { |b| 0.times.each(&b) }.to yield_control.at_least(:once)
}.to fail_with(/expected given block to yield control at least once but did not yield/)
expect {
expect { |b| 2.times.each(&b) }.to yield_control.at_most(:once)
}.to fail_with(/expected given block to yield control at most once but yielded twice/)
expect {
expect { |b| 1.times.each(&b) }.to yield_control.at_least(:twice)
}.to fail_with(/expected given block to yield control at least twice but yielded once/)
expect {
expect { |b| 3.times.each(&b) }.to yield_control.at_least(:once).at_most(2)
}.to fail_with(/expected given block to yield control between 1 and 2 times but yielded 3 times/)
expect {
expect { |b| 0.times.each(&b) }.to yield_control
}.to fail_with(/expected given block to yield control but did not yield/)
end
it 'does not return a meaningful value from the block' do
val = nil
expect { |b| val = _yield_with_args(&b) }.to yield_control
expect(val).to be_nil
end
it 'raises an error if given an invalid count argument' do
expect { yield_control.exactly('2') }.to raise_error(ArgumentError)
expect { yield_control.at_least(:trice_with_typo) }.to raise_error(ArgumentError)
expect { yield_control.at_most(nil) }.to raise_error(ArgumentError)
expect { yield_control.at_least(2).at_least(1) }.to raise_error(ArgumentError)
expect { yield_control.at_most(2).at_most(1) }.to raise_error(ArgumentError)
expect { yield_control.at_most(2).at_least(1).at_most(1) }.to raise_error(ArgumentError)
expect { yield_control.at_most(1).at_least(2) }.to raise_error(ArgumentError)
expect { yield_control.at_least(2).at_most(1) }.to raise_error(ArgumentError)
end
it 'is supports multiple calls to compatible count constraints' do
expect { |b| 1.upto(4, &b) }.to yield_control.at_least(3).at_most(4).times
expect { |b| 1.upto(2, &b) }.not_to yield_control.at_least(3).at_most(4).times
end
it 'raises an error on multiple incompatible calls to count constraints' do
expect { yield_control.once.twice }.to raise_error(/multiple/i)
end
context "with exact count" do
it 'fails if the block yields wrong number of times' do
expect {
expect { |b| [1, 2].each(&b) }.to yield_control.once
}.to fail_with(/expected given block to yield control once but yielded twice/)
expect {
expect { |b| [1, 2, 3].each(&b) }.to yield_control.twice
}.to fail_with(/expected given block to yield control twice but yielded 3 times/)
expect {
expect { |b| [1, 2].each(&b) }.to yield_control.thrice
}.to fail_with(/expected given block to yield control 3 times/)
end
it 'passes if the block yields the specified number of times' do
expect { |b| [1].each(&b) }.to yield_control.once
expect { |b| [1, 2].each(&b) }.to yield_control.twice
expect { |b| [1, 2, 3].each(&b) }.to yield_control.thrice
expect { |b| [1, 2, 3, 4].each(&b) }.to yield_control.exactly(4).times
end
end
context "with at_least count" do
it 'passes if the block yields the given number of times' do
expect { |b| [1, 2].each(&b) }.to yield_control.at_least(2).times
expect { |b| [1, 2, 3].each(&b) }.to yield_control.at_least(3).times
end
it 'passes if the block yields more times' do
expect { |b| [1, 2, 3].each(&b) }.to yield_control.at_least(2).times
expect { |b| [1, 2, 3, 4].each(&b) }.to yield_control.at_least(3).times
end
it 'allows :once, :twice, and :thrice to be passed as counts' do
expect { |b| [1].each(&b) }.to yield_control.at_least(:once)
expect { |b| [1, 2].each(&b) }.to yield_control.at_least(:once)
expect {
expect { |b| [].each(&b) }.to yield_control.at_least(:once)
}.to fail_with(/at least once/)
expect { |b| [1, 2].each(&b) }.to yield_control.at_least(:twice)
expect { |b| [1, 2, 3].each(&b) }.to yield_control.at_least(:twice)
expect {
expect { |b| [1].each(&b) }.to yield_control.at_least(:twice)
}.to fail_with(/at least twice/)
expect { |b| [1, 2, 3].each(&b) }.to yield_control.at_least(:thrice)
expect { |b| [1, 2, 3, 4].each(&b) }.to yield_control.at_least(:thrice)
expect {
expect { |b| [1, 2].each(&b) }.to yield_control.at_least(:thrice)
}.to fail_with(/at least 3 times/)
end
it 'fails if the block yields too few times' do
expect {
expect { |b| _yield_with_no_args(&b) }.to yield_control.at_least(2).times
}.to fail_with(/expected given block to yield control at least twice/)
end
end
context "with at_most count" do
it 'passes if the block yields the given number of times' do
expect { |b| [1, 2].each(&b) }.to yield_control.at_most(2).times
expect { |b| [1, 2, 3].each(&b) }.to yield_control.at_most(3).times
end
it 'passes if the block yields fewer times' do
expect { |b| [1, 2].each(&b) }.to yield_control.at_most(3).times
end
it 'allows :once, :twice, and :thrice to be passed as counts' do
expect { |b| [1].each(&b) }.to yield_control.at_most(:once)
expect {
expect { |b| [1, 2].each(&b) }.to yield_control.at_most(:once)
}.to fail_with(/expected given block to yield control at most once/)
expect { |b| [1, 2].each(&b) }.to yield_control.at_most(:twice)
expect {
expect { |b| [1, 2, 3].each(&b) }.to yield_control.at_most(:twice)
}.to fail_with(/expected given block to yield control at most twice/)
expect { |b| [1, 2, 3].each(&b) }.to yield_control.at_most(:thrice)
expect {
expect { |b| [1, 2, 3, 4].each(&b) }.to yield_control.at_most(:thrice)
}.to fail_with(/expected given block to yield control at most 3 times/)
end
it 'fails if the block yields too many times' do
expect {
expect { |b| [1, 2, 3].each(&b) }.to yield_control.at_most(2).times
}.to fail_with(/expected given block to yield control at most twice/)
end
end
end
describe "expect {...}.not_to yield_control" do
it 'passes if the block does not yield' do
expect { |b| _dont_yield(&b) }.not_to yield_control
end
it 'fails if the block does yield' do
expect {
expect { |b| _yield_with_no_args(&b) }.not_to yield_control
}.to fail_with(/expected given block not to yield control/)
end
it 'fails if the expect block does not accept an argument', :if => (RUBY_VERSION.to_f > 1.8) do
expect {
expect {}.not_to yield_control
}.to raise_error(/expect block must accept an argument/)
end
it 'still works when the block uses an arg splat' do
expect { |*args| _dont_yield(&args.first) }.not_to yield_control
end
it 'raises an error if the expect block arg is not passed to a method as a block' do
expect {
expect { |b| }.not_to yield_control
}.to raise_error(/must pass the argument.*as a block/)
end
end
end
RSpec.describe "yield_with_no_args matcher" do
include YieldHelpers
extend YieldHelpers
it_behaves_like "an RSpec probe-yielding block-only matcher" do
let(:matcher) { yield_with_no_args }
def valid_block(&block)
_yield_with_no_args(&block)
end
def invalid_block(&block)
_yield_with_args(1, &block)
end
end
it 'has a description' do
expect(yield_with_no_args.description).to eq("yield with no args")
end
it 'does not return a meaningful value from the block' do
val = nil
expect { |b| val = _yield_with_no_args(&b) }.to yield_with_no_args
expect(val).to be_nil
end
describe "expect {...}.to yield_with_no_args" do
it 'passes if the block yields with no args' do
expect { |b| _yield_with_no_args(&b) }.to yield_with_no_args
end
it 'passes if the block yields with no args using instance_exec' do
expect { |b| InstanceEvaler.new.yield_with_no_args(&b) }.to yield_with_no_args
end
it 'fails if the block does not yield' do
expect {
expect { |b| _dont_yield(&b) }.to yield_with_no_args
}.to fail_with(/expected given block to yield with no arguments, but did not yield/)
end
it 'fails if the block yields with args' do
expect {
expect { |b| _yield_with_args(1, &b) }.to yield_with_no_args
}.to fail_with(/expected given block to yield with no arguments, but yielded with arguments/)
end
it 'fails if the block yields with arg false' do
expect {
expect { |b| _yield_with_args(false, &b) }.to yield_with_no_args
}.to fail_with(/expected given block to yield with no arguments, but yielded with arguments/)
end
it 'raises an error if it yields multiple times' do
expect {
expect { |b| [1, 2].each(&b) }.to yield_with_no_args
}.to raise_error(/not designed.*yields multiple times/)
end
end
describe "expect {...}.not_to yield_with_no_args" do
it "passes if the block does not yield" do
expect { |b| _dont_yield(&b) }.not_to yield_with_no_args
end
it "passes if the block yields with args" do
expect { |b| _yield_with_args(1, &b) }.not_to yield_with_no_args
end
it "fails if the block yields with no args" do
expect {
expect { |b| _yield_with_no_args(&b) }.not_to yield_with_no_args
}.to fail_with(/expected given block not to yield with no arguments, but did/)
end
it 'fails if the expect block does not accept an argument', :if => (RUBY_VERSION.to_f > 1.8) do
expect {
expect {}.not_to yield_with_no_args
}.to raise_error(/expect block must accept an argument/)
end
it 'raises an error if the expect block arg is not passed to a method as a block' do
expect {
expect { |b| }.not_to yield_with_no_args
}.to raise_error(/must pass the argument.*as a block/)
end
end
end
RSpec.describe "yield_with_args matcher" do
include YieldHelpers
extend YieldHelpers
it_behaves_like "an RSpec probe-yielding block-only matcher" do
let(:matcher) { yield_with_args(1) }
def valid_block(&block)
_yield_with_args(1, &block)
end
def invalid_block(&block)
_yield_with_args(2, &block)
end
end
it 'has a description' do
expect(yield_with_args.description).to eq("yield with args")
expect(yield_with_args(1, 3).description).to eq("yield with args(1, 3)")
expect(yield_with_args(false).description).to eq("yield with args(false)")
end
it 'does not return a meaningful value from the block' do
val = nil
expect { |b| val = _yield_with_args(1, &b) }.to yield_with_args(1)
expect(val).to be_nil
end
describe "expect {...}.to yield_with_args" do
it 'passes if the block yields with arguments' do
expect { |b| _yield_with_args(1, &b) }.to yield_with_args
end
it 'passes if the matchers match at yield time only' do
expect { |b|
val = []
_yield_with_args(val, &b)
val << 1
}.to yield_with_args(be_empty)
end
it 'fails if the block does not yield' do
expect {
expect { |b| _dont_yield(&b) }.to yield_with_args
}.to fail_with(/expected given block to yield with arguments, but did not yield/)
end
it 'fails if the block yields with no arguments' do
expect {
expect { |b| _yield_with_no_args(&b) }.to yield_with_args
}.to fail_with(/expected given block to yield with arguments, but yielded with no arguments/)
end
it 'fails if the matchers match at return time only' do
expect {
expect { |b|
val = [1]
_yield_with_args(val, &b)
val.clear
}.to yield_with_args(be_empty)
}.to fail_with(dedent <<-EOS)
|expected given block to yield with arguments, but yielded with unexpected arguments
|expected: [(be empty)]
| got: [[1]]
EOS
end
it 'raises an error if it yields multiple times' do
expect {
expect { |b| [1, 2].each(&b) }.to yield_with_args
}.to raise_error(/not designed.*yields multiple times/)
end
end
describe "expect {...}.not_to yield_with_args" do
it 'fails if the block yields with arguments' do
expect {
expect { |b| _yield_with_args(1, &b) }.not_to yield_with_args
}.to fail_with(/expected given block not to yield with arguments, but did/)
end
it 'fails if the matchers match at yield time only' do
expect {
expect { |b|
val = []
_yield_with_args(val, &b)
val << 1
}.not_to yield_with_args(be_empty)
}.to fail_with(dedent <<-EOS)
|expected given block not to yield with arguments, but yielded with expected arguments
|expected not: [(be empty)]
| got: [[]]
EOS
end
it 'passes if the block does not yield' do
expect { |b| _dont_yield(&b) }.not_to yield_with_args
end
it 'passes if the block yields with no arguments' do
expect { |b| _yield_with_no_args(&b) }.not_to yield_with_args
end
it 'passes if the matchers match at return time only' do
expect { |b|
val = [1]
_yield_with_args(val, &b)
val.clear
}.not_to yield_with_args(be_empty)
end
it 'fails if the expect block does not accept an argument', :if => (RUBY_VERSION.to_f > 1.8) do
expect {
expect {}.not_to yield_with_args
}.to raise_error(/expect block must accept an argument/)
end
it 'raises an error if the expect block arg is not passed to a method as a block' do
expect {
expect { |b| }.not_to yield_with_args
}.to raise_error(/must pass the argument.*as a block/)
end
end
describe "expect {...}.to yield_with_args(3, 17)" do
it 'passes if the block yields with the given arguments' do
expect { |b| _yield_with_args(3, 17, &b) }.to yield_with_args(3, 17)
end
it 'passes if the block yields with the given arguments using instance_exec' do
expect { |b| InstanceEvaler.new.yield_with_args(3, 17, &b) }.to yield_with_args(3, 17)
end
it 'fails if the block does not yield' do
expect {
expect { |b| _dont_yield(&b) }.to yield_with_args(3, 17)
}.to fail_with(/expected given block to yield with arguments, but did not yield/)
end
it 'fails if the block yields with no arguments' do
expect {
expect { |b| _yield_with_no_args(&b) }.to yield_with_args(3, 17)
}.to fail_with(/expected given block to yield with arguments, but yielded with unexpected arguments/)
end
it 'fails if the block yields with different arguments' do
expect {
expect { |b| _yield_with_args("a", "b", &b) }.to yield_with_args("a", "c")
}.to fail_with(/expected given block to yield with arguments, but yielded with unexpected arguments/)
end
end
describe "expect {...}.to yield_with_args(matcher, matcher)" do
it 'passes when the matchers match the args' do
expect { |b|
_yield_with_args(1.1, "food", &b)
}.to yield_with_args(a_value_within(0.2).of(1), a_string_matching(/foo/))
end
it 'provides a description' do
description = yield_with_args(a_value_within(0.2).of(1), a_string_matching(/foo/)).description
expect(description).to eq("yield with args(a value within 0.2 of 1, a string matching /foo/)")
end
it 'fails with a useful error message when the matchers do not match the args' do
expect {
expect { |b|
_yield_with_args(2.1, "food", &b)
}.to yield_with_args(a_value_within(0.2).of(1), a_string_matching(/foo/))
}.to fail_with(dedent <<-EOS)
|expected given block to yield with arguments, but yielded with unexpected arguments
|expected: [(a value within 0.2 of 1), (a string matching /foo/)]
| got: [2.1, "food"]
EOS
end
end
describe "expect {...}.not_to yield_with_args(3, 17)" do
it 'passes if the block yields with different arguments' do
expect { |b| _yield_with_args("a", "b", &b) }.not_to yield_with_args("a", "c")
end
it 'fails if the block yields with the given arguments' do
expect {
expect { |b| _yield_with_args("a", "b", &b) }.not_to yield_with_args("a", "b")
}.to fail_with(/expected given block not to yield with arguments, but yielded with expected arguments/)
end
end
describe "expect {...}.not_to yield_with_args(matcher, matcher)" do
it 'passes when the matchers do not match the args' do
expect { |b|
_yield_with_args(2.1, "food", &b)
}.not_to yield_with_args(a_value_within(0.2).of(1), a_string_matching(/foo/))
end
it 'fails with a useful error message when the matchers do not match the args' do
expect {
expect { |b|
_yield_with_args(1.1, "food", &b)
}.not_to yield_with_args(a_value_within(0.2).of(1), a_string_matching(/foo/))
}.to fail_with(dedent <<-EOS)
|expected given block not to yield with arguments, but yielded with expected arguments
|expected not: [(a value within 0.2 of 1), (a string matching /foo/)]
| got: [1.1, "food"]
EOS
end
end
describe "expect {...}.to yield_with_args( false )" do
it 'passes if the block yields with the given arguments' do
expect { |b| _yield_with_args(false, &b) }.to yield_with_args(false)
end
it 'passes if the block yields with the given arguments using instance_exec' do
expect { |b| InstanceEvaler.new.yield_with_args(false, &b) }.to yield_with_args(false)
end
it 'fails if the block does not yield' do
expect {
expect { |b| _dont_yield(&b) }.to yield_with_args(false)
}.to fail_with(/expected given block to yield with arguments, but did not yield/)
end
it 'fails if the block yields with no arguments' do
expect {
expect { |b| _yield_with_no_args(&b) }.to yield_with_args(false)
}.to fail_with(/expected given block to yield with arguments, but yielded with unexpected arguments/)
end
it 'fails if the block yields with different arguments' do
expect {
expect { |b| _yield_with_args(false, &b) }.to yield_with_args(true)
}.to fail_with(/expected given block to yield with arguments, but yielded with unexpected arguments/)
end
end
describe "expect {...}.to yield_with_args(/reg/, /ex/)" do
it "passes if the block yields strings matching the regexes" do
expect { |b| _yield_with_args("regular", "expression", &b) }.to yield_with_args(/reg/, /ex/)
end
it "fails if the block yields strings that do not match the regexes" do
expect {
expect { |b| _yield_with_args("no", "match", &b) }.to yield_with_args(/reg/, /ex/)
}.to fail_with(/expected given block to yield with arguments, but yielded with unexpected arguments/)
end
end
describe "expect {...}.to yield_with_args(String, Integer)" do
it "passes if the block yields objects of the given classes" do
expect { |b| _yield_with_args("string", 15, &b) }.to yield_with_args(String, Integer)
end
it "passes if the block yields the given classes" do
expect { |b| _yield_with_args(String, Integer, &b) }.to yield_with_args(String, Integer)
end
it "fails if the block yields objects of different classes" do
expect {
expect { |b| _yield_with_args(15, "string", &b) }.to yield_with_args(String, Integer)
}.to fail_with(/expected given block to yield with arguments, but yielded with unexpected arguments/)
end
end
end
RSpec.describe "yield_successive_args matcher" do
include YieldHelpers
extend YieldHelpers
it_behaves_like "an RSpec probe-yielding block-only matcher" do
let(:matcher) { yield_successive_args(1, 2) }
def valid_block(&block)
[1, 2].each(&block)
end
def invalid_block(&block)
[3, 4].each(&block)
end
end
it 'has a description' do
expect(yield_successive_args(1, 3).description).to eq("yield successive args(1, 3)")
expect(yield_successive_args([:a, 1], [:b, 2]).description).to eq("yield successive args([:a, 1], [:b, 2])")
end
it 'does not return a meaningful value from the block' do
val = nil
expect { |b| val = _yield_with_args(1, &b) }.to yield_successive_args(1)
expect(val).to be_nil
end
it "works correctly when the method yields multiple args each time (passing case)" do
expect { |block|
['football', 'barstool'].each_with_index(&block)
}.to yield_successive_args(
[/foo/, 0],
[a_string_starting_with('bar'), 1]
)
end
it "works correctly when the method yields multiple args each time (failing case)" do
expect {
expect { |block|
['football', 'barstool'].each_with_index(&block)
}.to yield_successive_args(
[/foo/, 0],
[a_string_starting_with('abr'), 1]
)
}.to fail_with(dedent <<-EOS)
|expected given block to yield successively with arguments, but yielded with unexpected arguments
|expected: [[/foo/, 0], [(a string starting with "abr"), 1]]
| got: [["football", 0], ["barstool", 1]]
EOS
end
describe "expect {...}.to yield_successive_args([:a, 1], [:b, 2])" do
it 'passes when the block successively yields the given args' do
expect { |b| [[:a, 1], [:b, 2]].each(&b) }.to yield_successive_args([:a, 1], [:b, 2])
end
it 'passes if matched at yield time only' do
expect { |b|
[[:a, 1], [:b, 2]].each do |val|
_yield_with_args(val, &b)
val.clear
end
}.to yield_successive_args([:a, 1], [:b, 2])
end
it 'fails when the block does not yield that many times' do
expect {
expect { |b| [[:a, 1]].each(&b) }.to yield_successive_args([:a, 1], [:b, 2])
}.to fail_with(/but yielded with unexpected arguments/)
end
it 'fails when the block yields the right number of times but with different arguments' do
expect {
expect { |b| [[:a, 1], [:b, 3]].each(&b) }.to yield_successive_args([:a, 1], [:b, 2])
}.to fail_with(/but yielded with unexpected arguments/)
end
it 'fails if matched at return time only' do
expect {
expect { |b|
[[:a, 1], [:b, 2]].each do |eventual|
initial = []
_yield_with_args(initial, &b)
initial.concat(eventual)
end
}.to yield_successive_args([:a, 1], [:b, 2])
}.to fail_with(dedent <<-EOS)
|expected given block to yield successively with arguments, but yielded with unexpected arguments
|expected: [[:a, 1], [:b, 2]]
| got: [[], []]
EOS
end
end
describe "expect {...}.to yield_successive_args(1, 2, 3)" do
it 'passes when the block successively yields the given args' do
expect { |b| [1, 2, 3].each(&b) }.to yield_successive_args(1, 2, 3)
end
it 'passes when the block successively yields the given args using instance_exec' do
expect { |b| InstanceEvaler.new.each_arg(1, 2, 3, &b) }.to yield_successive_args(1, 2, 3)
end
it 'fails when the block does not yield the expected args' do
expect {
expect { |b| [1, 2, 4].each(&b) }.to yield_successive_args([:a, 1], [:b, 2])
}.to fail_with(/but yielded with unexpected arguments/)
end
end
describe "expect {...}.to yield_successive_args(matcher, matcher)" do
it 'passes when the successively yielded args match the matchers' do
expect { |b|
%w[ food barn ].each(&b)
}.to yield_successive_args(a_string_matching(/foo/), a_string_matching(/bar/))
end
it 'fails when the successively yielded args do not match the matchers' do
expect {
expect { |b|
%w[ barn food ].each(&b)
}.to yield_successive_args(a_string_matching(/foo/), a_string_matching(/bar/))
}.to fail_with(dedent <<-EOS)
|expected given block to yield successively with arguments, but yielded with unexpected arguments
|expected: [(a string matching /foo/), (a string matching /bar/)]
| got: ["barn", "food"]
EOS
end
it 'provides a description' do
description = yield_successive_args(a_string_matching(/foo/), a_string_matching(/bar/)).description
expect(description).to eq("yield successive args(a string matching /foo/, a string matching /bar/)")
end
end
describe "expect {...}.not_to yield_successive_args(1, 2, 3)" do
it 'passes when the block does not yield' do
expect { |b| _dont_yield(&b) }.not_to yield_successive_args(1, 2, 3)
end
it 'passes when the block yields the wrong number of times' do
expect { |b| [1, 2].each(&b) }.not_to yield_successive_args(1, 2, 3)
end
it 'passes when the block yields the wrong arguments' do
expect { |b| [1, 2, 4].each(&b) }.not_to yield_successive_args(1, 2, 3)
end
it 'fails when the block yields the given arguments' do
expect {
expect { |b| [1, 2, 3].each(&b) }.not_to yield_successive_args(1, 2, 3)
}.to fail_with(/expected given block not to yield successively/)
end
it 'fails if the expect block does not accept an argument', :if => (RUBY_VERSION.to_f > 1.8) do
expect {
expect {}.not_to yield_successive_args(1, 2, 3)
}.to raise_error(/expect block must accept an argument/)
end
it 'raises an error if the expect block arg is not passed to a method as a block' do
expect {
expect { |b| }.not_to yield_successive_args(1, 2, 3)
}.to raise_error(/must pass the argument.*as a block/)
end
end
describe "expect {...}.not_to yield_successive_args(matcher, matcher)" do
it 'passes when the successively yielded args do not match the matchers' do
expect { |b|
%w[ barn food ].each(&b)
}.not_to yield_successive_args(a_string_matching(/foo/), a_string_matching(/bar/))
end
it 'passes when the successively yielded args do not match the matchers (at yield time only)' do
expect { |b|
%w[ food barn ].each do |eventual|
initial = ''
_yield_with_args(initial, &b)
initial << eventual
end
}.not_to yield_successive_args(a_string_matching(/foo/), a_string_matching(/bar/))
end
it 'fails when the successively yielded args match the matchers' do
expect {
expect { |b|
%w[ food barn ].each(&b)
}.not_to yield_successive_args(a_string_matching(/foo/), a_string_matching(/bar/))
}.to fail_with(dedent <<-EOS)
|expected given block not to yield successively with arguments, but yielded with expected arguments
|expected not: [(a string matching /foo/), (a string matching /bar/)]
| got: ["food", "barn"]
EOS
end
it 'fails when the successively yielded args match the matchers (at yield time only)' do
values = %w[ food barn ].collect { |value| value.dup }
expect {
expect { |b|
values.each do |val|
_yield_with_args(val, &b)
val.sub!(/.+/, '')
end
}.not_to yield_successive_args(a_string_matching(/foo/), a_string_matching(/bar/))
}.to fail_with(dedent <<-EOS)
|expected given block not to yield successively with arguments, but yielded with expected arguments
|expected not: [(a string matching /foo/), (a string matching /bar/)]
| got: ["food", "barn"]
EOS
end
end
describe "expect {...}.to yield_successive_args(String, Integer)" do
it "passes if the block successively yields objects of the given classes" do
expect { |b| ["string", 15].each(&b) }.to yield_successive_args(String, Integer)
end
it "passes if the block yields the given classes" do
expect { |b| [String, Integer].each(&b) }.to yield_successive_args(String, Integer)
end
it "fails if the block yields objects of different classes" do
expect {
expect { |b| [15, "string"].each(&b) }.to yield_successive_args(String, Integer)
}.to fail_with(/expected given block to yield successively with arguments/)
end
end
end
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