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module ExampleExpectations
class ArbitraryMatcher
def initialize(*args, &block)
if args.last.is_a? Hash
@expected = args.last[:expected]
end
@expected = block.call if block
@block = block
end
def matches?(target)
@target = target
return @expected == target
end
def with(new_value)
@expected = new_value
self
end
def failure_message
"expected #{@expected}, got #{@target}"
end
def failure_message_when_negated
"expected not #{@expected}, got #{@target}"
end
end
class PositiveOnlyMatcher < ArbitraryMatcher
undef failure_message_when_negated rescue nil
end
def arbitrary_matcher(*args, &block)
ArbitraryMatcher.new(*args, &block)
end
def positive_only_matcher(*args, &block)
PositiveOnlyMatcher.new(*args, &block)
end
end
module RSpec
module Expectations
RSpec.describe PositiveExpectationHandler do
include ExampleExpectations
it "handles submitted args" do
expect(5).to arbitrary_matcher(:expected => 5)
expect(5).to arbitrary_matcher(:expected => "wrong").with(5)
expect { expect(5).to arbitrary_matcher(:expected => 4) }.to fail_with("expected 4, got 5")
expect { expect(5).to arbitrary_matcher(:expected => 5).with(4) }.to fail_with("expected 4, got 5")
expect(5).not_to arbitrary_matcher(:expected => 4)
expect(5).not_to arbitrary_matcher(:expected => 5).with(4)
expect { expect(5).not_to arbitrary_matcher(:expected => 5) }.to fail_with("expected not 5, got 5")
expect { expect(5).not_to arbitrary_matcher(:expected => 4).with(5) }.to fail_with("expected not 5, got 5")
end
it "handles the submitted block" do
expect(5).to arbitrary_matcher { 5 }
expect(5).to arbitrary_matcher(:expected => 4) { 5 }
expect(5).to arbitrary_matcher(:expected => 4).with(5) { 3 }
end
describe "#handle_matcher" do
it "asks the matcher if it matches" do
matcher = double("matcher")
actual = Object.new
expect(matcher).to receive(:matches?).with(actual).and_return(true)
RSpec::Expectations::PositiveExpectationHandler.handle_matcher(actual, matcher)
end
it "returns the match value" do
matcher = double("matcher")
actual = Object.new
expect(matcher).to receive(:matches?).with(actual).and_return(:this_value)
expect(RSpec::Expectations::PositiveExpectationHandler.handle_matcher(actual, matcher)).to eq :this_value
end
it "calls failure_message if the matcher implements it" do
matcher = double("matcher", :failure_message => "message", :matches? => false)
actual = Object.new
expect(::RSpec::Expectations).to receive(:fail_with).with("message")
RSpec::Expectations::PositiveExpectationHandler.handle_matcher(actual, matcher)
end
it "calls fail if matcher.diffable?" do
matcher = double("matcher",
:diffable? => true,
:failure_message => "message",
:matches? => false,
:expected => 1,
:actual => 2
)
actual = Object.new
expect(::RSpec::Expectations).to receive(:fail_with).with("message", 1, 2)
RSpec::Expectations::PositiveExpectationHandler.handle_matcher(actual, matcher)
end
it "calls failure_message if the matcher does not implement failure_message" do
matcher = double("matcher", :failure_message => "message", :matches? => false)
actual = Object.new
expect(::RSpec::Expectations).to receive(:fail_with).with("message")
RSpec::Expectations::PositiveExpectationHandler.handle_matcher(actual, matcher)
end
it "uses the custom failure message when one is provided" do
matcher = double("matcher", :failure_message => "message", :matches? => false)
actual = Object.new
expect(::RSpec::Expectations).to receive(:fail_with).with("custom")
RSpec::Expectations::PositiveExpectationHandler.handle_matcher(actual, matcher, "custom")
end
it "uses the custom failure message when one is provided as a callable object" do
matcher = double("matcher", :failure_message => "message", :matches? => false)
actual = Object.new
failure_message = double("failure message", :call => "custom")
expect(::RSpec::Expectations).to receive(:fail_with).with("custom")
RSpec::Expectations::PositiveExpectationHandler.handle_matcher(actual, matcher, failure_message)
end
end
end
RSpec.describe NegativeExpectationHandler do
describe "#handle_matcher" do
context "when the matcher responds to `does_not_match?`" do
it "returns true when `does_not_match?` returns true" do
matcher = double("matcher")
actual = Object.new
expect(matcher).to receive(:does_not_match?).with(actual).and_return(true)
expect(RSpec::Expectations::NegativeExpectationHandler.handle_matcher(actual, matcher)).to be_truthy
end
it "raises an expectation failure when `does_not_match?` returns false" do
matcher = double("matcher", :failure_message_when_negated => "Error!")
actual = Object.new
expect(matcher).to receive(:does_not_match?).with(actual).and_return(false)
expect {
RSpec::Expectations::NegativeExpectationHandler.handle_matcher(actual, matcher)
}.to raise_error(RSpec::Expectations::ExpectationNotMetError, "Error!")
end
end
context "when the matcher does not respond to `does_not_match?`" do
it "returns true when `matches?` returns false" do
matcher = double("matcher")
actual = Object.new
expect(matcher).to receive(:matches?).with(actual).and_return(false)
expect(RSpec::Expectations::NegativeExpectationHandler.handle_matcher(actual, matcher)).to be_truthy
end
it "raises an expectation failure when `matches?` returns true" do
matcher = double("matcher", :failure_message_when_negated => "Error!")
actual = Object.new
expect(matcher).to receive(:matches?).with(actual).and_return(true)
expect {
RSpec::Expectations::NegativeExpectationHandler.handle_matcher(actual, matcher)
}.to raise_error(RSpec::Expectations::ExpectationNotMetError, "Error!")
end
end
it "calls fail if matcher.diffable?" do
matcher = double("matcher",
:diffable? => true,
:failure_message_when_negated => "message",
:matches? => true,
:expected => 1,
:actual => 2
)
actual = Object.new
expect(::RSpec::Expectations).to receive(:fail_with).with("message", 1, 2)
RSpec::Expectations::NegativeExpectationHandler.handle_matcher(actual, matcher)
end
it "uses the custom failure message when one is provided" do
matcher = double("matcher", :failure_message_when_negated => "message", :matches? => true)
actual = Object.new
expect(::RSpec::Expectations).to receive(:fail_with).with("custom")
RSpec::Expectations::NegativeExpectationHandler.handle_matcher(actual, matcher, "custom")
end
it "uses the custom failure message when one is provided as a callable object" do
matcher = double("matcher", :failure_message_when_negated => "message", :matches? => true)
actual = Object.new
failure_message = double("failure message", :call => "custom")
expect(::RSpec::Expectations).to receive(:fail_with).with("custom")
RSpec::Expectations::NegativeExpectationHandler.handle_matcher(actual, matcher, failure_message)
end
end
end
end
end
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