/
dsl_spec.rb
1348 lines (1109 loc) · 42 KB
/
dsl_spec.rb
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RSpec.describe "a matcher defined using the matcher DSL" do
def question?
:answer
end
def ok
"ok"
end
it "supports calling custom matchers from within other custom matchers" do
RSpec::Matchers.define :be_ok do
match { |actual| actual == ok }
end
RSpec::Matchers.define :be_well do
match { |actual| expect(actual).to be_ok }
end
expect(ok).to be_well
end
it "has access to methods available in the scope of the example" do
RSpec::Matchers.define(:matcher_a) {}
expect(matcher_a.question?).to eq(:answer)
end
it "raises when method is missing from local scope as well as matcher" do
RSpec::Matchers.define(:matcher_b) {}
expect { matcher_b.i_dont_exist }.to raise_error(NameError)
end
if RSpec::Support::RubyFeatures.required_kw_args_supported?
binding.eval(<<-CODE, __FILE__, __LINE__)
it 'supports the use of required keyword arguments in definition block' do
RSpec::Matchers.define(:match_required_kw) do |bar:|
match { expect(actual).to eq bar }
end
expect(1).to match_required_kw(bar: 1)
end
def kw(a:)
a
end
it "supports the use of required keyword arguments on methods" do
RSpec::Matchers.define(:matcher_required_kw_on_method) {}
expect(matcher_required_kw_on_method.kw(a: 1)).to eq(1)
end
CODE
end
if RSpec::Support::RubyFeatures.kw_args_supported?
binding.eval(<<-CODE, __FILE__, __LINE__)
it 'supports the use of optional keyword arguments in definition block' do
RSpec::Matchers.define(:match_optional_kw) do |bar: nil|
match { expect(actual).to eq bar }
end
expect(1).to match_optional_kw(bar: 1)
end
def optional_kw(a: nil)
a
end
it "supports the use of optional keyword arguments on methods" do
RSpec::Matchers.define(:matcher_optional_kw_on_method) {}
expect(matcher_optional_kw_on_method.optional_kw(a: 1)).to eq(1)
end
CODE
end
it "clears user instance variables between invocations" do
RSpec::Matchers.define(:be_just_like) do |expected|
match do |actual|
@foo ||= expected
@foo == actual
end
end
expect(3).to be_just_like(3)
expect(4).to be_just_like(4)
end
describe '#block_arg' do
before(:context) do
RSpec::Matchers.define :be_lazily_equal_to do
match { actual == block_arg.call }
description do
"be lazily equal to #{block_arg.call}"
end
end
end
it "it is used in a passing condition" do
expect(1).to be_lazily_equal_to { 1 }
end
it "it is used in a failing condition" do
expect { expect(1).to be_lazily_equal_to { 2 } }.to fail_with(/be lazily equal to 2/)
end
end
it "warns when passing block to the block of define", :if => (RUBY_VERSION.to_f > 1.8) do
expect(RSpec).to receive(:warning).with(/be_warning.*a_block.*block_arg/)
RSpec::Matchers.define :be_warning do |&a_block|
match { a_block }
end
end
describe "#respond_to?" do
it "returns true for methods in example scope" do
RSpec::Matchers.define(:matcher_c) {}
expect(matcher_c).to respond_to(:question?)
end
it "returns false for methods not defined in matcher or example scope" do
RSpec::Matchers.define(:matcher_d) {}
expect(matcher_d).not_to respond_to(:i_dont_exist)
end
end
end
class UnexpectedError < StandardError; end
module MatcherHelperModule
def self.included(base)
base.module_exec do
def included_method; end
end
end
def self.extended(base)
base.instance_exec do
def extended_method; end
end
end
def greeting
"Hello, World"
end
end
module RSpec::Matchers::DSL
RSpec.describe "#alias_matcher" do
describe "an alias matcher defined in the current scope" do
alias_matcher :be_untrue_in_this_scope, :be_falsy
it "is available only in the current scope" do
expect(false).to be_untrue_in_this_scope
end
end
describe "an aliased matcher defined in another scope" do
it "is not available in the current scope" do
expect {
expect(false).to be_untrue_in_this_scope
}.to fail_with("expected false to respond to `untrue_in_this_scope?`")
end
end
end
RSpec.describe "#define_negated_matcher" do
describe "a negated matcher defined in the current scope" do
define_negated_matcher :be_untrue_in_this_scope, :be_truthy
it "is available only in the current scope" do
expect(false).to be_untrue_in_this_scope
end
end
describe "a negated matcher defined in another scope" do
it "is not available in the current scope" do
expect {
expect(false).to be_untrue_in_this_scope
}.to fail_with("expected false to respond to `untrue_in_this_scope?`")
end
end
end
RSpec.describe Matcher do
def new_matcher(name, *expected, &block)
RSpec::Matchers::DSL::Matcher.new(name, block, self, *expected)
end
it_behaves_like "an RSpec matcher", :valid_value => 1, :invalid_value => 2 do
let(:matcher) do
new_matcher(:equal_to_1) do
match { |v| v == 1 }
end
end
end
it "can be stored aside and used later" do
# Supports using rspec-expectation matchers as argument matchers in
# rspec-mocks.
RSpec::Matchers.define :example_matcher do |expected|
match do |actual|
actual == expected
end
end
m1 = example_matcher(1)
m2 = example_matcher(2)
expect(m1.matches?(1)).to be_truthy
expect(m2.matches?(2)).to be_truthy
end
context 'using deprecated APIs' do
before { allow_deprecation }
describe "failure_message_for_should" do
let(:matcher) do
new_matcher(:foo) do
match { false }
failure_message_for_should { "failed" }
end
end
line = __LINE__ - 3
it 'defines the failure message for a positive expectation' do
expect {
expect(nil).to matcher
}.to fail_with("failed")
end
it 'prints a deprecation warning' do
expect_deprecation_with_call_site(__FILE__, line, /failure_message_for_should/)
matcher
end
end
describe "failure_message_for_should_not" do
let(:matcher) do
new_matcher(:foo) do
match { true }
failure_message_for_should_not { "failed" }
end
end
line = __LINE__ - 3
it 'defines the failure message for a negative expectation' do
expect {
expect(nil).not_to matcher
}.to fail_with("failed")
end
it 'prints a deprecation warning' do
expect_deprecation_with_call_site(__FILE__, line, /failure_message_for_should_not/)
matcher
end
end
describe "match_for_should" do
let(:matcher) do
new_matcher(:foo) do
match_for_should { |arg| arg }
end
end
line = __LINE__ - 3
it 'defines the positive expectation match logic' do
expect(true).to matcher
expect { expect(false).to matcher }.to fail_with(/foo/)
end
it 'prints a deprecation warning' do
expect_deprecation_with_call_site(__FILE__, line, /match_for_should/)
matcher
end
end
describe "match_for_should_not" do
let(:matcher) do
new_matcher(:foo) do
match_for_should_not { |arg| !arg }
end
end
line = __LINE__ - 3
it 'defines the positive expectation match logic' do
expect(false).not_to matcher
expect { expect(true).not_to matcher }.to fail_with(/foo/)
end
it 'prints a deprecation warning' do
expect_deprecation_with_call_site(__FILE__, line, /match_for_should_not/)
matcher
end
end
end
context "with an included module" do
let(:matcher) do
new_matcher(:be_a_greeting) do
include MatcherHelperModule
match { |actual| actual == greeting }
end
end
it "has access to the module's methods" do
matcher.matches?("Hello, World")
end
it "runs the module's included hook" do
expect(matcher).to respond_to(:included_method)
end
it "does not run the module's extended hook" do
expect(matcher).not_to respond_to(:extended_method)
end
it 'allows multiple modules to be included at once' do
m = new_matcher(:multiple_modules) do
include Enumerable
include Comparable
end
expect(m).to be_a(Enumerable)
expect(m).to be_a(Comparable)
end
end
context "without overrides" do
let(:matcher) do
new_matcher(:be_a_multiple_of, 3) do |multiple|
match do |actual|
actual % multiple == 0
end
end
end
it "provides a default description" do
expect(matcher.description).to eq "be a multiple of 3"
end
it "provides a default positive expectation failure message" do
expect { expect(8).to matcher }.to fail_with 'expected 8 to be a multiple of 3'
end
it "provides a default negative expectation failure message" do
expect { expect(9).to_not matcher }.to fail_with 'expected 9 not to be a multiple of 3'
end
end
context "without overrides with chained matchers" do
let(:matcher) do
new_matcher(:be_bigger_than, 5) do |five|
match do |to_match|
(to_match > five) && smaller_than_ceiling?(to_match) && divisible_by_divisor?(to_match)
end
match_when_negated do |to_match|
(to_match <= five) || greater_than_ceiling(to_match) && not_divisible_by_divisor?(to_match)
end
chain :and_smaller_than do |ceiling|
@ceiling = ceiling
end
chain :and_divisible_by do |divisor|
@divisor = divisor
end
private
def smaller_than_ceiling?(to_match)
to_match < @ceiling
end
def greater_than_ceiling(to_match)
to_match >= @ceiling
end
def divisible_by_divisor?(to_match)
@divisor % to_match == 0
end
def not_divisible_by_divisor?(to_match)
@divisor % to_match != 0
end
end
end
context "when the matchers are chained" do
include_context "isolate include_chain_clauses_in_custom_matcher_descriptions"
context "without include_chain_clauses_in_custom_matcher_descriptions configured" do
before { RSpec::Expectations.configuration.include_chain_clauses_in_custom_matcher_descriptions = false }
let(:match) { matcher.and_smaller_than(10).and_divisible_by(3) }
it "provides a default description that does not include any of the chained matchers' descriptions" do
expect(match.description).to eq 'be bigger than 5'
end
it "provides a default positive expectation failure message that does not include any of the chained matchers' descriptions" do
expect { expect(8).to match }.to fail_with 'expected 8 to be bigger than 5'
end
it "provides a default negative expectation failure message that does not include the any of the chained matchers's descriptions" do
expect { expect(9).to_not match }.to fail_with 'expected 9 not to be bigger than 5'
end
end
context "with include_chain_clauses_in_custom_matcher_descriptions configured to be true" do
before do
expect(RSpec::Expectations.configuration.include_chain_clauses_in_custom_matcher_descriptions?).to be true
end
it "provides a default description that includes the chained matchers' descriptions in they were used" do
expect(matcher.and_divisible_by(3).and_smaller_than(29).and_smaller_than(20).and_divisible_by(5).description).to \
eq 'be bigger than 5 and divisible by 3 and smaller than 29 and smaller than 20 and divisible by 5'
end
it "provides a default positive expectation failure message that includes the chained matchers' failures" do
expect { expect(30).to matcher.and_smaller_than(29).and_divisible_by(3) }.to \
fail_with 'expected 30 to be bigger than 5 and smaller than 29 and divisible by 3'
end
it "provides a default negative expectation failure message that includes the chained matchers' failures" do
expect { expect(21).to_not matcher.and_smaller_than(29).and_divisible_by(3) }.to \
fail_with 'expected 21 not to be bigger than 5 and smaller than 29 and divisible by 3'
end
end
it 'only decides if to include the chained clauses at the time description is invoked' do
matcher.and_divisible_by(3)
expect {
RSpec::Expectations.configuration.include_chain_clauses_in_custom_matcher_descriptions = false
}.to change { matcher.description }.
from('be bigger than 5 and divisible by 3').
to('be bigger than 5')
end
end
end
context "with separate match logic for positive and negative expectations" do
let(:matcher) do
new_matcher(:to_be_composed_of, 7, 11) do |a, b|
match do |actual|
actual == a * b
end
match_when_negated do |actual|
actual == a + b
end
end
end
it "invokes the match block for #matches?" do
expect(matcher.matches?(77)).to be_truthy
expect(matcher.matches?(18)).to be_falsey
end
it "invokes the match_when_negated block for #does_not_match?" do
expect(matcher.does_not_match?(77)).to be_falsey
expect(matcher.does_not_match?(18)).to be_truthy
end
it "provides a default failure message for negative expectations" do
matcher.does_not_match?(77)
expect(matcher.failure_message_when_negated).to eq "expected 77 not to to be composed of 7 and 11"
end
it 'can access helper methods from `match_when_negated`' do
matcher = new_matcher(:be_foo) do
def foo
:foo
end
match_when_negated do |actual|
actual != foo
end
end
expect(matcher.does_not_match?(:bar)).to be true
end
end
it "allows helper methods to be defined with #define_method to have access to matcher parameters" do
matcher = new_matcher(:name, 3, 4) do |a, b|
define_method(:sum) { a + b }
end
expect(matcher.sum).to eq 7
end
it "is not diffable by default" do
matcher = new_matcher(:name) {}
expect(matcher).not_to be_diffable
end
it "is diffable when told to be" do
matcher = new_matcher(:name) { diffable }
expect(matcher).to be_diffable
end
it 'handles multiline string diffs' do
actual = "LINE1\nline2\n"
expected = "line1\nline2\n"
matcher = new_matcher(:custom_match, expected) do
match { |act| act == expected }
diffable
end
diff = nil
begin
allow(RSpec::Matchers.configuration).to receive(:color?).and_return(false)
expect(actual).to matcher
rescue RSpec::Expectations::ExpectationNotMetError => e
diff = e.message.sub(/\A.*Diff:/m, "Diff:").gsub(/^\s*/, '')
end
expect(diff).to eq "Diff:\n@@ -1,3 +1,3 @@\n-line1\n+LINE1\nline2\n"
end
it 'does not confuse the diffability of different matchers' do
# Necessary to guard against a regression that involved
# using a class variable to store the diffable state,
# which had the side effect of causing all custom matchers
# to share that state
m1 = new_matcher(:m1) { diffable }
m2 = new_matcher(:m2) {}
m3 = new_matcher(:m3) { diffable }
expect(m1).to be_diffable
expect(m2).not_to be_diffable
expect(m3).to be_diffable
end
it "provides expected" do
matcher = new_matcher(:name, "expected string") {}
expect(matcher.expected).to eq 'expected string'
end
it "provides expected when there is more than one argument" do
matcher = new_matcher(:name, "expected string", "another arg") {}
expect(matcher.expected).to eq ['expected string', "another arg"]
end
it "provides expected_as_array which returns an array regardless of expected" do
matcher = new_matcher(:name, "expected string") {}
expect(matcher.expected_as_array).to eq ['expected string']
matcher = new_matcher(:name, "expected\nstring") {}
expect(matcher.expected_as_array).to eq ["expected\nstring"]
matcher = new_matcher(:name, "expected string", "another arg") {}
expect(matcher.expected_as_array).to eq ['expected string', "another arg"]
end
it "provides actual when `match` is used" do
matcher = new_matcher(:name, 'expected string') do
match { |actual| }
end
matcher.matches?('actual string')
expect(matcher.actual).to eq 'actual string'
end
it "provides actual when the `match` block accepts splat args" do
matcher = new_matcher(:actual) do
match { |*actual| actual == [5] }
end
expect(matcher.matches?(5)).to be true
expect(matcher.matches?(4)).to be false
end
it 'allows an early `return` to be used from a `match` block' do
matcher = new_matcher(:with_return, 5) do |expected|
match { |actual| return true if expected == actual }
end
expect(matcher.matches?(5)).to be true
expect(matcher.matches?(4)).to be_falsey
end
it 'provides actual when `match_unless_raises` is used' do
matcher = new_matcher(:name, 'expected string') do
match_unless_raises(SyntaxError) { |actual| }
end
matcher.matches?('actual string')
expect(matcher.actual).to eq 'actual string'
end
it 'allows an early `return` to be used from a `match_unless_raises` block' do
matcher = new_matcher(:with_return) do
match_unless_raises(ArgumentError) do |actual|
return actual if [true, false].include?(actual)
raise ArgumentError
end
end
expect(matcher.matches?(true)).to be true
# It should match even if it returns false, because no error was raised.
expect(matcher.matches?(false)).to be true
expect(matcher.matches?(4)).to be_falsey
end
it 'provides actual when `match_when_negated` is used' do
matcher = new_matcher(:name, 'expected string') do
match_when_negated { |actual| }
end
matcher.does_not_match?('actual string')
expect(matcher.actual).to eq 'actual string'
end
it 'allows an early `return` to be used from a `match_when_negated` block' do
matcher = new_matcher(:with_return, 5) do |expected|
match_when_negated { |actual| return true if expected != actual }
end
expect(matcher.does_not_match?(5)).to be_falsey
expect(matcher.does_not_match?(4)).to be true
end
context "wrapping another expectation in a `match` block" do
context "with a positive expectation" do
let(:matcher) do
new_matcher(:name, "value") do |expected|
match do |actual|
expect(actual).to eq expected
end
end
end
specify "`match?` returns true if the wrapped expectation passes" do
expect(matcher.matches?('value')).to be_truthy
end
specify "`match?` returns false if the wrapped expectation fails" do
expect(matcher.matches?('other value')).to be_falsey
end
end
context "with a negative expectation" do
let(:matcher) do
new_matcher(:name, "purposely_the_same") do |expected|
match do |actual|
expect(actual).not_to eq expected
end
end
end
specify "`match?` returns true if the wrapped expectation passes" do
expect(matcher.matches?('purposely_different')).to be_truthy
end
specify "`match?` returns false if the wrapped expectation fails" do
expect(matcher.matches?('purposely_the_same')).to be_falsey
end
end
it "can use the `include` matcher from a `match` block" do
RSpec::Matchers.define(:descend_from) do |mod|
match do |klass|
expect(klass.ancestors).to include(mod)
end
end
expect(Integer).to descend_from(Object)
expect(Integer).not_to descend_from(Array)
expect {
expect(Integer).to descend_from(Array)
}.to fail_with(/expected Integer to descend from Array/)
expect {
expect(Integer).not_to descend_from(Object)
}.to fail_with(/expected Integer not to descend from Object/)
end
it "can use the `match` matcher from a `match` block" do
RSpec::Matchers.define(:be_a_phone_number_string) do
match do |string|
expect(string).to match(/\A\d{3}\-\d{3}\-\d{4}\z/)
end
end
expect("206-123-1234").to be_a_phone_number_string
expect("foo").not_to be_a_phone_number_string
expect {
expect("foo").to be_a_phone_number_string
}.to fail_with(/expected "foo" to be a phone number string/)
expect {
expect("206-123-1234").not_to be_a_phone_number_string
}.to fail_with(/expected "206-123-1234" not to be a phone number string/)
end
context "when used within an `aggregate_failures` block" do
it 'does not aggregate the inner expectation failure' do
use_an_internal_expectation = new_matcher(:use_an_internal_expectation) do
match do |actual|
expect(actual).to end_with "z"
end
end
expect {
aggregate_failures do
expect(1).to be_even
expect("foo").to use_an_internal_expectation
end
}.to fail do |error|
expect(error).to have_attributes(:failures => [
an_object_having_attributes(:message => "expected `1.even?` to return true, got false"),
an_object_having_attributes(:message => 'expected "foo" to use an internal expectation')
])
end
end
it 'does not aggregate the inner expectation failure (negation)' do
use_an_internal_expectation = new_matcher(:use_an_internal_expectation) do
match_when_negated do |actual|
expect(actual).not_to end_with "o"
end
end
expect {
aggregate_failures do
expect(1).to be_even
expect("foo").not_to use_an_internal_expectation
end
}.to fail do |error|
expect(error).to have_attributes(:failures => [
an_object_having_attributes(:message => "expected `1.even?` to return true, got false"),
an_object_having_attributes(:message => 'expected "foo" not to use an internal expectation')
])
end
end
it 'still raises the expectation failure internally in case the matcher relies upon rescuing the error' do
error_rescued = false
rescue_failure = new_matcher(:rescue_failure) do
match do |actual|
begin
expect(actual).to eq(2)
rescue RSpec::Expectations::ExpectationNotMetError
error_rescued = true
end
end
end
begin
aggregate_failures do
expect(1).to rescue_failure
end
rescue RSpec::Expectations::ExpectationNotMetError # rubocop:disable Lint/HandleExceptions
end
expect(error_rescued).to be true
end
end
end
context "wrapping another expectation in a `match_when_negated` block" do
context "with a positive expectation" do
let(:matcher) do
new_matcher(:name, "purposely_the_same") do |expected|
match_when_negated do |actual|
expect(actual).to eq expected
end
end
end
specify "`does_not_match?` returns true if the wrapped expectation passes" do
expect(matcher.does_not_match?('purposely_the_same')).to be_truthy
end
specify "`does_not_match?` returns false if the wrapped expectation fails" do
expect(matcher.does_not_match?('purposely_different')).to be_falsey
end
end
context "with a negative expectation" do
let(:matcher) do
new_matcher(:name, "value") do |expected|
match_when_negated do |actual|
expect(actual).not_to eq expected
end
end
end
specify "`does_not_match?` returns true if the wrapped expectation passes" do
expect(matcher.does_not_match?('other value')).to be_truthy
end
specify "`does_not_match?` returns false if the wrapped expectation fails" do
expect(matcher.does_not_match?('value')).to be_falsey
end
end
end
context "with overrides" do
let(:matcher) do
new_matcher(:be_boolean, true) do |boolean|
match do |actual|
actual
end
description do |actual|
"be the boolean #{boolean} (actual was #{actual})"
end
failure_message do |actual|
"expected #{actual} to be the boolean #{boolean}"
end
failure_message_when_negated do |actual|
"expected #{actual} not to be the boolean #{boolean}"
end
end
end
it "does not hide result of match block when true" do
expect(matcher.matches?(true)).to be_truthy
end
it "does not hide result of match block when false" do
expect(matcher.matches?(false)).to be_falsey
end
it "overrides the description (which yields `actual`)" do
matcher.matches?(true)
expect(matcher.description).to eq "be the boolean true (actual was true)"
end
it "overrides the failure message for positive expectations" do
matcher.matches?(false)
expect(matcher.failure_message).to eq "expected false to be the boolean true"
end
it "overrides the failure message for negative expectations" do
matcher.matches?(true)
expect(matcher.failure_message_when_negated).to eq "expected true not to be the boolean true"
end
it 'can access helper methods from `description`' do
matcher = new_matcher(:desc) do
def subdesc() "sub description" end
description { "Desc (#{subdesc})" }
end
expect(matcher.description).to eq("Desc (sub description)")
end
it 'can access helper methods from `failure_message`' do
matcher = new_matcher(:positive_failure_message) do
def helper() "helper" end
failure_message { helper }
end
expect(matcher.failure_message).to eq("helper")
end
it 'can access helper methods from `failure_message_when_negated`' do
matcher = new_matcher(:negative_failure_message) do
def helper() "helper" end
failure_message_when_negated { helper }
end
expect(matcher.failure_message_when_negated).to eq("helper")
end
it 'can exit early with a `return` from `description` just like in a method' do
matcher = new_matcher(:desc) do
description { return "Desc" }
end
expect(matcher.description).to eq("Desc")
end
it 'can exit early with a `return` from `failure_message` just like in a method' do
matcher = new_matcher(:positive_failure_message) do
failure_message { return "msg" }
end
expect(matcher.failure_message).to eq("msg")
end
it 'can exit early with a `return` from `failure_message_when_negated` just like in a method' do
matcher = new_matcher(:negative_failure_message) do
failure_message_when_negated { return "msg" }
end
expect(matcher.failure_message_when_negated).to eq("msg")
end
end
context "with description override and chained matcher" do
context "by default" do
let(:matcher) do
new_matcher(:be_even) do
match do |to_match|
to_match.even? && (to_match % @divisible_by == 0)
end
chain :and_divisible_by do |divisible_by|
@divisible_by = divisible_by
end
description { super() + " and divisible by #{@divisible_by}" }
end
end
context "with include_chain_clauses_in_custom_matcher_descriptions configured to false" do
include_context "isolate include_chain_clauses_in_custom_matcher_descriptions"
before { RSpec::Expectations.configuration.include_chain_clauses_in_custom_matcher_descriptions = false }
it "provides a default description that does not include any of the chained matchers' descriptions" do
expect(matcher.and_divisible_by(10).description).to eq 'be even and divisible by 10'
end
end
context "with include_chain_clauses_in_custom_matcher_descriptions configured to true" do
it "provides a default description that does includes the chained matchers' descriptions" do
expect(matcher.and_divisible_by(10).description).to eq 'be even and divisible by 10 and divisible by 10'
end
end
end
end
context "matching blocks" do
it 'cannot match blocks by default' do
matcher = new_matcher(:foo) { match { true } }
expect(3).to matcher
expect {
expect { 3 }.to matcher
}.to fail_with(/must pass an argument/)
end
it 'can match blocks if it declares `supports_block_expectations`' do
matcher = new_matcher(:foo) do
match { true }
supports_block_expectations
end
expect(3).to matcher
expect { 3 }.to matcher
end
it 'will not swallow expectation errors from blocks when told to' do
matcher = new_matcher(:foo) do
match(:notify_expectation_failures => true) do |actual|
actual.call
true
end
supports_block_expectations
end
expect {
expect { raise RSpec::Expectations::ExpectationNotMetError.new('original') }.to matcher
}.to raise_error(RSpec::Expectations::ExpectationNotMetError, /original/)
end
end
context "matching blocks when negated" do
it 'cannot match blocks by default' do
matcher = new_matcher(:foo) { match_when_negated { true } }
expect(3).to_not matcher
expect {
expect { 3 }.to_not matcher
}.to fail_with(/must pass an argument/)
end
it 'can match blocks if it declares `supports_block_expectations`' do
matcher = new_matcher(:foo) do
match_when_negated { true }
supports_block_expectations
end
expect(3).to_not matcher
expect { 3 }.to_not matcher
end
it 'will not swallow expectation errors from blocks when told to' do
matcher = new_matcher(:foo) do
match_when_negated(:notify_expectation_failures => true) do |actual|
actual.call
true
end
supports_block_expectations
end
expect {
expect { raise RSpec::Expectations::ExpectationNotMetError.new('original') }.to_not matcher
}.to raise_error(RSpec::Expectations::ExpectationNotMetError, /original/)
end
end
context "#new" do
it "passes matches? arg to match block" do
matcher = new_matcher(:ignore) do