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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe 'Enumerator#next patch fix' do
describe 'Enumerator' do
RSpec::Matchers.define :contain_unique_method_calls_in_order do |expected|
attr_reader :actual
match do |actual|
@actual_err = actual
regexps = expected.map { |method_name| { name: method_name, regexp: make_regexp(method_name) } }
@actual = actual.backtrace.filter_map do |line|
regexp = regexps.find { |r| r[:regexp].match? line }
regexp[:name] if regexp
end
expected == @actual
end
diffable
failure_message do
"#{super()}\n\nFull error backtrace:\n #{@actual_err.backtrace.join("\n ")}"
end
private
def make_regexp(method_name)
Regexp.new("/spec/initializers/enumerator_next_patch_spec\\.rb:[0-9]+:in `#{method_name}'$")
end
end
def have_been_raised_by_next_and_not_fixed_up
contain_unique_method_calls_in_order %w(call_enum_method)
end
def have_been_raised_by_enum_object_and_fixed_up
contain_unique_method_calls_in_order %w(make_error call_enum_method)
end
def have_been_raised_by_nested_next_and_fixed_up
contain_unique_method_calls_in_order %w(call_nested_next call_enum_method)
end
methods = [
{
name: 'next',
expected_value: 'Test value'
},
{
name: 'next_values',
expected_value: ['Test value']
},
{
name: 'peek',
expected_value: 'Test value'
},
{
name: 'peek_values',
expected_value: ['Test value']
}
]
methods.each do |method|
describe "##{method[:name]}" do
def call_enum_method
enumerator.send(method_name)
end
let(:method_name) { method[:name] }
subject { call_enum_method }
describe 'normal yield' do
let(:enumerator) { Enumerator.new { |yielder| yielder << 'Test value' } }
it 'returns yielded value' do
is_expected.to eq(method[:expected_value])
end
end
describe 'end of iteration' do
let(:enumerator) { Enumerator.new { |_| } }
it 'does not fix up StopIteration' do
expect { subject }.to raise_error do |err|
expect(err).to be_a(StopIteration)
expect(err).to have_been_raised_by_next_and_not_fixed_up
end
end
context 'nested enum object' do
def call_nested_next
nested_enumerator.next
end
let(:nested_enumerator) { Enumerator.new { |_| } }
let(:enumerator) { Enumerator.new { |yielder| yielder << call_nested_next } }
it 'fixes up StopIteration thrown by another instance of #next' do
expect { subject }.to raise_error do |err|
expect(err).to be_a(StopIteration)
expect(err).to have_been_raised_by_nested_next_and_fixed_up
end
end
end
end
describe 'arguments error' do
def call_enum_method
enumerator.send(method_name, 'extra argument')
end
let(:enumerator) { Enumerator.new { |_| } }
it 'does not fix up ArgumentError' do
expect { subject }.to raise_error do |err|
expect(err).to be_a(ArgumentError)
expect(err).to have_been_raised_by_next_and_not_fixed_up
end
end
end
describe 'error' do
let(:enumerator) { Enumerator.new { |_| raise error } }
let(:error) { make_error }
it 'fixes up StopIteration' do
def make_error
StopIteration.new.tap { |err| err.set_backtrace(caller) }
end
expect { subject }.to raise_error do |err|
expect(err).to be(error)
expect(err).to have_been_raised_by_enum_object_and_fixed_up
end
end
it 'fixes up ArgumentError' do
def make_error
ArgumentError.new.tap { |err| err.set_backtrace(caller) }
end
expect { subject }.to raise_error do |err|
expect(err).to be(error)
expect(err).to have_been_raised_by_enum_object_and_fixed_up
end
end
it 'adds backtrace from other errors' do
def make_error
StandardError.new('This is a test').tap { |err| err.set_backtrace(caller) }
end
expect { subject }.to raise_error do |err|
expect(err).to be(error)
expect(err).to have_been_raised_by_enum_object_and_fixed_up
expect(err.message).to eq('This is a test')
end
end
end
end
end
end
end
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