我在Rspec中编写了一个自定义匹配方法,用于匹配针对散列的对象。我要做的是为expect
的每一行设置自定义故障消息。
describe "/cars" do
car = FactoryGirl.create(:car, name: 'Alpha')
describe car do
it "displays single items" do
get cars_path
parsed_response = JSON.parse(response.body)
record_hash = parsed_response['cars'][0]
is_expected.to be_a_car_match_of(record_hash)
end
end
end
RSpec::Matchers.define :be_a_car_match_of do |hash|
match do |car|
expect(car.id).to eq(hash['id'])
expect(car.name).to eq(hash['name'])
end
failure_message do |car|
"expected that #{car} would be a match of #{hash}"
end
end
所以我想要的是像下面这样的东西:
RSpec::Matchers.define :be_a_car_match_of do |hash|
match do |car|
expect(car.id).to eq(hash['id']) 'ids did not match'
expect(car.name).to eq(hash['name']) 'names did not match'
end
end
这将打印出一个更清晰的错误信息。
我最初在mini-test中这样做,但由于各种原因(超出我的控制范围)需要将其更改为rspec。我在mini-test中的代码是:
def assert_car(car, hash)
assert_equal car.id, hash['id'], "ids did not match"
assert_equal car.name, hash['name'], "names did not match"
end
这就是我想要复制的。
下面是另一个需要更少设置的示例:
require 'rspec/expectations'
RSpec::Matchers.define :be_testing do |expected|
match do |actual|
expect(5).to eq(5)
expect(4).to eq(5)
end
failure_message do
"FAIL"
end
end
describe 'something' do
it 'something else' do
expect("expected").to be_testing('actual')
end
end
当这个例子运行时,输出"FAIL"。另一方面,如果我有:
describe 'something' do
it 'something else' do
expect(4).to eq(5)
end
end
我将得到以下错误信息:
expected: 5
got: 4
这就是我想要的。我想知道自定义匹配器的哪个部分失败了。
您可以调用低级matches?
方法而不是expect
。像这样:
require 'rspec/expectations'
RSpec::Matchers.define :be_a_positive_integer do
m1, m2 = nil, nil # matchers
r1, r2 = false, false # results
match do |actual|
m1 = be_a Integer # this returns matcher instances
m2 = be > 0
r1 = m1.matches?(actual) # evaluate matchers
r2 = m2.matches?(actual)
r1 && r2 # true if both are true
end
failure_message do |actual| # collect error messages from matchers
messages = []
messages << m1.failure_message unless r1
messages << m2.failure_message unless r2
messages.join("n")
end
end
describe -1 do
it { is_expected.to be_a_positive_integer }
end
describe 1.0 do
it { is_expected.to be_a_positive_integer }
end
describe -1.0 do
it { is_expected.to be_a_positive_integer }
end
输出:Failures:
1) -1 should be a positive integer
Failure/Error: it { is_expected.to be_a_positive_integer }
expected: > 0
got: -1
# ./ruby_spec.rb:24:in `block (2 levels) in <top (required)>'
2) 1.0 should be a positive integer
Failure/Error: it { is_expected.to be_a_positive_integer }
expected 1.0 to be a kind of Integer
# ./ruby_spec.rb:28:in `block (2 levels) in <top (required)>'
3) -1.0 should be a positive integer
Failure/Error: it { is_expected.to be_a_positive_integer }
expected -1.0 to be a kind of Integer
expected: > 0
got: -1.0
# ./ruby_spec.rb:32:in `block (2 levels) in <top (required)
我认为aggregate_failures
是你正在寻找的:
它用一个块封装了一组期望。在块内,期望失败不会像正常情况那样立即中止;相反,失败将被聚合成一个在块末尾引发的单个异常,从而允许您查看所有失败的期望。
参见:https://relishapp.com/rspec/rspec-expectations/docs/aggregating-failures