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RSpec.describe "#have_attributes matcher" do
include RSpec::Support::Spec::DiffHelpers
Person = Struct.new(:name, :age)
class Person
def parent(parent_name)
@parent = parent_name
end
end
# This simulates a behaviour of Rails, see #1162.
class DynamicAttributes
def initialize(attributes)
@attributes = attributes
end
def method_missing(name, *args, &block)
@attributes[name] || super
end
def respond_to?(method_name)
@attributes.keys.include?(method_name) || super
end
end
let(:wrong_name) { "Wrong Name" }
let(:wrong_age) { 11 }
let(:correct_name) { "Correct name" }
let(:correct_age) { 33 }
let(:person) { Person.new(correct_name, correct_age) }
it "is diffable" do
expect(have_attributes(:age => correct_age)).to be_diffable
end
describe "expect(...).to have_attributes(with_one_attribute)" do
it_behaves_like "an RSpec value matcher", :valid_value => Person.new("Correct name", 33), :invalid_value => Person.new("Wrong Name", 11) do
let(:matcher) { have_attributes(:name => "Correct name") }
end
it "passes if target has the provided attributes" do
expect(person).to have_attributes(:name => correct_name)
end
it "passes if target responds to :sym but does not implement method" do
expect(DynamicAttributes.new(:name => "value")).to have_attributes(:name => "value")
end
it "fails if target does not have any of the expected attributes" do
expect {
expect(person).to have_attributes(:name => wrong_name)
}.to fail_with(%r|expected #{object_inspect person} to have attributes #{hash_inspect :name => wrong_name} but had attributes #{hash_inspect :name => correct_name }|)
end
it "fails with correct message if object manipulates its data" do
counter = Class.new do
def initialize; @count = 1; end
def count
@count += 1
end
end.new
expect {
expect(counter).to have_attributes(:count => 1)
}.to fail_with(%r|to have attributes #{hash_inspect :count => 1} but had attributes #{hash_inspect :count => 2 }|)
end
it 'diffs the attributes received with those expected' do
allow(RSpec::Matchers.configuration).to receive_messages(:color? => false)
expected_diff = dedent(<<-EOS)
|@@ #{one_line_header} @@
|-:name => "Wrong Name",
|+:name => "Correct name",
EOS
expect {
expect(person).to have_attributes(:name => wrong_name)
}.to fail_including(expected_diff)
end
it "fails if target does not responds to any of the attributes" do
expect {
expect(person).to have_attributes(:color => 'red')
}.to fail_including("expected #{object_inspect person} to respond to :color")
end
it "doesn't produce a diff if the target fails the respond to check" do
expect {
expect(person).to have_attributes(:color => 'red')
}.to fail_with(a_string_excluding "Diff")
end
it "fails if target responds to the attribute but requires arguments" do
expect {
expect(person).to have_attributes(:parent => 'Billy')
}.to fail_including("expected #{object_inspect person} to respond to :parent with 0 arguments")
end
describe "expect(...).to have_attributes(key => matcher)" do
it "passes when the matchers match" do
expect(person).to have_attributes(:age => (a_value > 30))
end
it 'provides a description' do
description = have_attributes(:age => (a_value > 30)).description
expect(description).to eq("have attributes {:age => (a value > 30)}")
end
it "fails with a clear message when the matcher does not match" do
expect {
expect(person).to have_attributes(:age => (a_value < 10))
}.to fail_including("expected #{object_inspect person} to have attributes {:age => (a value < 10)}")
end
end
end
describe "expect(...).to_not have_attributes(with_one_attribute)" do
it "passes if target does not have any of the expected attributes" do
expect(person).to_not have_attributes(:age => wrong_age)
end
it "fails if target has all of the expected attributes" do
expect {
expect(person).to_not have_attributes(:age => correct_age)
}.to fail_with(%r|expected #{object_inspect person} not to have attributes #{hash_inspect :age => correct_age}|)
end
it "doesn't produce a diff" do
expect {
expect(person).to_not have_attributes(:age => correct_age)
}.to fail_with(a_string_excluding "Diff")
end
it "fails if target does not responds to any of the attributes" do
expect {
expect(person).to_not have_attributes(:color => 'red')
}.to fail_including("expected #{object_inspect person} to respond to :color")
end
it "fails if target responds to the attribute but requires arguments" do
expect {
expect(person).to_not have_attributes(:parent => 'Billy')
}.to fail_including("expected #{object_inspect person} to respond to :parent with 0 arguments")
end
end
describe "expect(...).to have_attributes(with_multiple_attributes)" do
it_behaves_like "an RSpec value matcher", :valid_value => Person.new("Correct name", 33), :invalid_value => Person.new("Wrong Name", 11) do
let(:matcher) { have_attributes(:name => "Correct name", :age => 33) }
end
it "passes if target has the provided attributes" do
expect(person).to have_attributes(:name => correct_name, :age => correct_age)
end
it "fails if target does not have any of the expected attributes" do
expect {
expect(person).to have_attributes(:name => correct_name, :age => wrong_age)
}.to fail_with(%r|expected #{object_inspect person} to have attributes #{hash_inspect :age => wrong_age, :name => correct_name }|)
end
it 'diffs the attributes received with those expected' do
allow(RSpec::Matchers.configuration).to receive_messages(:color? => false)
expected_diff = dedent(<<-EOS)
|@@ #{one_line_header(3)} @@
|-:age => 11,
|+:age => 33,
EOS
expected_diff << "\n :name => \"Correct name\",\n" if Diff::LCS::VERSION.to_f < 1.4
expect {
expect(person).to have_attributes(:name => correct_name, :age => wrong_age)
}.to fail_including(expected_diff)
end
it "fails if target does not responds to any of the attributes" do
expect {
expect(person).to have_attributes(:name => correct_name, :color => 'red')
}.to fail_including("expected #{object_inspect person} to respond to :color")
end
it "fails if target responds to the attribute but requires arguments" do
expect {
expect(person).to have_attributes(:name => correct_name, :parent => 'Billy')
}.to fail_including("expected #{object_inspect person} to respond to :parent with 0 arguments")
end
end
describe "expect(...).to_not have_attributes(with_multiple_attributes)" do
it "passes if target has none of the expected attributes" do
expect(person).to_not have_attributes(:name => wrong_name, :age => wrong_age)
end
it "fails if target has any of the expected attributes" do
expect {
expect(person).to_not have_attributes(:name => wrong_name, :age => correct_age)
}.to fail_with(%r|expected #{object_inspect person} not to have attributes #{hash_inspect :age => correct_age, :name => wrong_name }|)
end
it "fails if target has all of the expected attributes" do
expect {
expect(person).to_not have_attributes(:name => correct_name, :age => correct_age)
}.to fail_with(%r|expected #{object_inspect person} not to have attributes #{hash_inspect :age => correct_age, :name => correct_name }|)
end
it "fails if target does not responds to any of the attributes" do
expect {
expect(person).to_not have_attributes(:name => correct_name, :color => 'red')
}.to fail_including("expected #{object_inspect person} to respond to :color")
end
it "fails if target responds to the attribute but requires arguments" do
expect {
expect(person).to_not have_attributes(:name => correct_name, :parent => 'Billy')
}.to fail_including("expected #{object_inspect person} to respond to :parent with 0 arguments")
end
end
include RSpec::Matchers::Composable
# a helper for failure message assertion
def object_inspect(object)
surface_descriptions_in object.inspect
end
end
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