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dsl_spec.rb
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dsl_spec.rb
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# encoding: utf-8
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
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 "#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
describe Matcher do
def new_matcher(name, *expected, &block)
RSpec::Matchers::DSL::Matcher.
new(name, block, *expected).
tap { |m| m.matcher_execution_context = self }
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, 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
matcher.matches?(8)
expect(matcher.failure_message).to eq "expected 8 to be a multiple of 3"
end
it "provides a default negative expectation failure message" do
matcher.matches?(9)
expect(matcher.failure_message_when_negated).to eq "expected 9 not to be a multiple of 3"
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 (expect(...).to eq ...)" do
let(:matcher) do
new_matcher(:name, "value") do |expected|
match do |actual|
expect(actual).to eq expected
end
end
end
it "returns true if the wrapped expectation passes" do
expect(matcher.matches?('value')).to be_truthy
end
it "returns false if the wrapped expectation fails" do
expect(matcher.matches?('other value')).to be_falsey
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(Fixnum).to descend_from(Object)
expect(Fixnum).not_to descend_from(Array)
expect {
expect(Fixnum).to descend_from(Array)
}.to fail_with(/expected Fixnum to descend from Array/)
expect {
expect(Fixnum).not_to descend_from(Object)
}.to fail_with(/expected Fixnum 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
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 "#new" do
it "passes matches? arg to match block" do
matcher = new_matcher(:ignore) do
match do |actual|
actual == 5
end
end
expect(matcher.matches?(5)).to be_truthy
end
it "exposes arg submitted through #new to matcher block" do
matcher = new_matcher(:ignore, 4) do |expected|
match do |actual|
actual > expected
end
end
expect(matcher.matches?(5)).to be_truthy
end
end
context "with no args" do
let(:matcher) do
new_matcher(:matcher_name) do
match do |actual|
actual == 5
end
end
end
it "matches" do
expect(matcher.matches?(5)).to be_truthy
end
it "describes" do
expect(matcher.description).to eq "matcher name"
end
end
context "with 1 arg" do
let(:matcher) do
new_matcher(:matcher_name, 1) do |expected|
match do |actual|
actual == 5 && expected == 1
end
end
end
it "matches" do
expect(matcher.matches?(5)).to be_truthy
end
it "describes" do
expect(matcher.description).to eq "matcher name 1"
end
end
context "with multiple args" do
let(:matcher) do
new_matcher(:matcher_name, 1, 2, 3, 4) do |a, b, c, d|
match do |sum|
a + b + c + d == sum
end
end
end
it "matches" do
expect(matcher.matches?(10)).to be_truthy
end
it "describes" do
expect(matcher.description).to eq "matcher name 1, 2, 3, and 4"
end
end
it "supports helper methods" do
matcher = new_matcher(:be_similar_to, [1, 2, 3]) do |sample|
match do |actual|
similar?(sample, actual)
end
def similar?(a, b)
a.sort == b.sort
end
end
expect(matcher.matches?([2,3,1])).to be_truthy
end
it "supports fluent interface" do
matcher = new_matcher(:first_word) do
def second_word
self
end
end
expect(matcher.second_word).to eq matcher
end
it "treats method missing normally for undeclared methods" do
matcher = new_matcher(:ignore) { }
expect { matcher.non_existent_method }.to raise_error(NoMethodError)
end
it "has access to other matchers" do
matcher = new_matcher(:ignore, 3) do |expected|
match do |actual|
extend RSpec::Matchers
expect(actual).to eql(5 + expected)
end
end
expect(matcher.matches?(8)).to be_truthy
end
context 'when multiple instances of the same matcher are used in the same example' do
RSpec::Matchers.define(:be_like_a) do |expected|
match { |actual| actual == expected }
description { "be like a #{expected}" }
failure_message { "expected to be like a #{expected}" }
failure_message_when_negated { "expected not to be like a #{expected}" }
end
# Note: these bugs were only exposed when creating both instances
# first, then checking their descriptions/failure messages.
#
# That's why we eager-instantiate them here.
let!(:moose) { be_like_a("moose") }
let!(:horse) { be_like_a("horse") }
it 'allows them to use the expected value in the description' do
expect(horse.description).to eq("be like a horse")
expect(moose.description).to eq("be like a moose")
end
it 'allows them to use the expected value in the positive failure message' do
expect(moose.failure_message).to eq("expected to be like a moose")
expect(horse.failure_message).to eq("expected to be like a horse")
end
it 'allows them to use the expected value in the negative failure message' do
expect(moose.failure_message_when_negated).to eq("expected not to be like a moose")
expect(horse.failure_message_when_negated).to eq("expected not to be like a horse")
end
it 'allows them to match separately' do
expect("moose").to moose
expect("horse").to horse
expect("horse").not_to moose
expect("moose").not_to horse
end
end
describe "#match_unless_raises" do
context "with an assertion" do
mod = Module.new do
def assert_equal(a,b)
raise UnexpectedError.new("#{b} does not equal #{a}") unless a == b
end
end
let(:matcher) do
new_matcher(:equal, 4) do |expected|
include mod
match_unless_raises UnexpectedError do
assert_equal expected, actual
end
end
end
context "with passing assertion" do
it "passes" do
expect(matcher.matches?(4)).to be_truthy
end
end
context "with failing assertion" do
it "fails" do
expect(matcher.matches?(5)).to be_falsey
end
it "provides the raised exception" do
matcher.matches?(5)
expect(matcher.rescued_exception.message).to eq("5 does not equal 4")
end
end
end
context "with an unexpected error" do
let(:matcher) do
new_matcher(:foo, :bar) do |expected|
match_unless_raises SyntaxError do |actual|
raise "unexpected exception"
end
end
end
it "raises the error" do
expect {
matcher.matches?(:bar)
}.to raise_error("unexpected exception")
end
end
context "without a specified error class" do
let(:matcher) do
new_matcher(:foo) do
match_unless_raises do |actual|
raise Exception unless actual == 5
end
end
end
it 'passes if no error is raised' do
expect(matcher.matches?(5)).to be true
end
it 'fails if an exception is raised' do
expect(matcher.matches?(4)).to be false
end
end
end
it "can define chainable methods" do
matcher = new_matcher(:name) do
chain(:expecting) do |expected_value|
@expected_value = expected_value
end
match { |actual| actual == @expected_value }
end
expect(matcher.expecting('value').matches?('value')).to be_truthy
expect(matcher.expecting('value').matches?('other value')).to be_falsey
end
it 'can use an early return from a `chain` block' do
matcher = new_matcher(:name) do
chain(:expecting) do |expected_value|
@expected_value = expected_value
return
end
match { |actual| actual == @expected_value }
end
expect(matcher.expecting('value').matches?('value')).to be_truthy
expect(matcher.expecting('value').matches?('other value')).to be_falsey
end
it 'allows chainable methods to accept blocks' do
matcher = new_matcher(:name) do
chain(:for_block) { |&b| @block = b }
match { |value| @block.call == value }
end
expect(matcher.for_block { 5 }.matches?(5)).to be true
expect(matcher.for_block { 3 }.matches?(4)).to be false
end
it "prevents name collisions on chainable methods from different matchers" do
m1 = new_matcher(:m1) { chain(:foo) { raise "foo in m1" } }
m2 = new_matcher(:m2) { chain(:foo) { raise "foo in m2" } }
expect { m1.foo }.to raise_error("foo in m1")
expect { m2.foo }.to raise_error("foo in m2")
end
context "defined using the dsl" do
def a_method_in_the_example
"method defined in the example"
end
it "can access methods in the running example" do |example|
RSpec::Matchers.define(:__access_running_example) do
match do |actual|
a_method_in_the_example == "method defined in the example"
end
end
expect(example).to __access_running_example
end
it 'can get a method object for methods in the running example', :if => (RUBY_VERSION.to_f > 1.8) do
matcher = new_matcher(:get_method_object) { }
method = matcher.method(:a_method_in_the_example)
expect(method.call).to eq("method defined in the example")
end
it 'indicates that it responds to a method from the running example' do
matcher = new_matcher(:respond_to) { }
expect(matcher).to respond_to(:a_method_in_the_example)
expect(matcher).not_to respond_to(:a_method_not_in_the_example)
end
it "raises NoMethodError for methods not in the running_example" do |example|
RSpec::Matchers.define(:__raise_no_method_error) do
match do |actual|
self.a_method_not_in_the_example == "method defined in the example"
end
end
expected_msg = "RSpec::Matchers::DSL::Matcher"
expected_msg << " __raise_no_method_error" unless rbx?
expect {
expect(example).to __raise_no_method_error
}.to raise_error(NoMethodError, /#{expected_msg}/)
end
def rbx?
defined?(RUBY_ENGINE) && RUBY_ENGINE == 'rbx'
end
end
end
end