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module RSpec
module Matchers
RSpec.describe 'RSpec::Matchers.define_negated_matcher' do
RSpec::Matchers.define :my_base_non_negated_matcher do
match { |actual| actual == foo }
def foo
13
end
def description
"my base matcher description"
end
end
shared_examples "making a copy" do |copy_method|
context "when making a copy via `#{copy_method}`" do
it "uses a copy of the base matcher" do
base_matcher = include(3)
aliased = AliasedNegatedMatcher.new(base_matcher, Proc.new {})
copy = aliased.__send__(copy_method)
expect(copy).not_to equal(aliased)
expect(copy.base_matcher).not_to equal(base_matcher)
expect(copy.base_matcher).to be_a(RSpec::Matchers::BuiltIn::Include)
expect(copy.base_matcher.expected).to eq([3])
end
it "copies custom matchers properly so they can work even though they have singleton behavior" do
base_matcher = my_base_non_negated_matcher
aliased = AliasedNegatedMatcher.new(base_matcher, Proc.new { |a| a })
copy = aliased.__send__(copy_method)
expect(copy).not_to equal(aliased)
expect(copy.base_matcher).not_to equal(base_matcher)
expect(15).to copy
expect { expect(13).to copy }.to fail_with(/expected 13/)
end
end
end
include_examples "making a copy", :dup
include_examples "making a copy", :clone
RSpec::Matchers.define_negated_matcher :an_array_excluding, :include
it_behaves_like "an RSpec value matcher", :valid_value => [1, 3], :invalid_value => [1, 2] do
let(:matcher) { an_array_excluding(2) }
end
it 'works properly when composed' do
list = 1.upto(10).to_a
expect { list.delete(5) }.to change { list }.to(an_array_excluding 5)
end
describe "the failure message" do
context "for a matcher with default failure messages" do
RSpec::Matchers.define(:be_awesome) { match(&:awesome?) }
RSpec::Matchers.define_negated_matcher :be_lame, :be_awesome
context "when failing positively" do
it "uses the phrasing from the provided defined matcher alias" do
expect {
expect(double(:awesome? => true, :inspect => "<Object>")).to be_lame
}.to fail_with("expected <Object> to be lame")
end
end
context "when failing negatively" do
it "uses the phrasing from the provided defined matcher alias" do
expect {
expect(double(:awesome? => false, :inspect => "<Object>")).not_to be_lame
}.to fail_with("expected <Object> not to be lame")
end
end
context "when accessed via an alias that is not included in failure messages" do
alias_method :be_fantastic, :be_awesome
RSpec::Matchers.define_negated_matcher :be_terrible, :be_fantastic
context "when failing positively" do
it "uses the wrapped matcher's `failure_message_when_negated`" do
expect {
expect(double(:awesome? => true, :inspect => "<Object>")).to be_terrible
}.to fail_with("expected <Object> not to be awesome")
end
end
context "when failing negatively" do
it "uses the wrapped matcher's `failure_message`" do
expect {
expect(double(:awesome? => false, :inspect => "<Object>")).not_to be_terrible
}.to fail_with("expected <Object> to be awesome")
end
end
end
end
context "for a matcher with a customized `failure_message_when_negated`" do
RSpec::Matchers.define(:be_tall) do
match(&:tall?)
failure_message_when_negated do |actual|
"expected #{actual.inspect} not to be tall, but was tall"
end
end
RSpec::Matchers.define_negated_matcher :be_short, :be_tall
context "when failing positively" do
it "uses the wrapped matcher's `failure_message_when_negated` since it may include more detail" do
expect {
expect(double(:tall? => true, :inspect => "<Object>")).to be_short
}.to fail_with("expected <Object> not to be tall, but was tall")
end
end
context "when failing negatively" do
it "uses the wrapped matcher's `failure_message` since it may include more detail" do
expect {
expect(double(:tall? => false, :inspect => "<Object>")).not_to be_short
}.to fail_with("expected <Object> to be tall")
end
end
end
end
context 'when no block is passed' do
RSpec::Matchers.define :be_an_odd_number do
match { |actual| actual.odd? }
end
RSpec::Matchers.define_negated_matcher :be_an_even_number, :be_an_odd_number
it 'uses the default negated description' do
expect(be_an_even_number.description).to eq("be an even number")
end
context "when matched positively" do
it 'matches values that fail the original matcher' do
expect { expect(22).to be_an_odd_number }.to fail_with("expected 22 to be an odd number")
expect(22).to be_an_even_number
end
it "fails matches against values that pass the original matcher" do
expect(21).to be_an_odd_number
expect { expect(21).to be_an_even_number }.to fail_with("expected 21 to be an even number")
end
end
context "when matched negatively" do
it 'matches values that fail the original matcher' do
expect { expect(21).not_to be_an_odd_number }.to fail_with("expected 21 not to be an odd number")
expect(21).not_to be_an_even_number
end
it "fails matches against values that pass the original matcher" do
expect(22).not_to be_an_odd_number
expect { expect(22).not_to be_an_even_number }.to fail_with("expected 22 not to be an even number")
end
end
end
context 'when the negated description is overridden' do
RSpec::Matchers.define :be_bigger_than_ten do
match { |actual| actual > 10 }
end
RSpec::Matchers.define_negated_matcher :be_smaller_than_ten, :be_bigger_than_ten do |desc|
"#{desc.sub('bigger', 'smaller')} (overridden)"
end
it 'overrides the description with the provided block' do
expect(be_smaller_than_ten.description).to eq("be smaller than ten (overridden)")
end
it 'overrides the failure message with the provided block' do
expect { expect(12).to be_smaller_than_ten }.to fail_with("expected 12 to be smaller than ten (overridden)")
end
end
context "for a matcher that has custom `match_when_negated` logic" do
RSpec::Matchers.define :matcher_with_custom_negation do |match_value|
match { match_value }
match_when_negated { |actual| actual == :does_not_match_true }
end
RSpec::Matchers.define_negated_matcher :negated_matcher_with_custom_negation, :matcher_with_custom_negation
it "uses the `match_when_negated` logic for matching" do
expect(:does_not_match_true).to negated_matcher_with_custom_negation(true)
expect {
expect(:does_not_match_false).to negated_matcher_with_custom_negation(true)
}.to fail
end
it "uses the `match` logic for `expect(..).not_to`" do
expect(:foo).not_to negated_matcher_with_custom_negation(true)
end
end
end
end
end
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