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# frozen_string_literal: true
require 'spec_helper'
describe Grape::Middleware::Stack do
module StackSpec
class FooMiddleware; end
class BarMiddleware; end
class BlockMiddleware
attr_reader :block
def initialize(&block)
@block = block
end
end
end
subject { described_class.new }
let(:proc) { -> {} }
let(:others) { [[:use, StackSpec::BarMiddleware], [:insert_before, StackSpec::BarMiddleware, StackSpec::BlockMiddleware, proc]] }
before do
subject.use StackSpec::FooMiddleware
end
describe '#use' do
it 'pushes a middleware class onto the stack' do
expect { subject.use StackSpec::BarMiddleware }
.to change(subject, :size).by(1)
expect(subject.last).to eq(StackSpec::BarMiddleware)
end
it 'pushes a middleware class with arguments onto the stack' do
expect { subject.use StackSpec::BarMiddleware, false, my_arg: 42 }
.to change(subject, :size).by(1)
expect(subject.last).to eq(StackSpec::BarMiddleware)
expect(subject.last.args).to eq([false, { my_arg: 42 }])
end
it 'pushes a middleware class with block arguments onto the stack' do
expect { subject.use StackSpec::BlockMiddleware, &proc }
.to change(subject, :size).by(1)
expect(subject.last).to eq(StackSpec::BlockMiddleware)
expect(subject.last.args).to eq([])
expect(subject.last.block).to eq(proc)
end
end
describe '#insert' do
it 'inserts a middleware class at the integer index' do
expect { subject.insert 0, StackSpec::BarMiddleware }
.to change(subject, :size).by(1)
expect(subject[0]).to eq(StackSpec::BarMiddleware)
expect(subject[1]).to eq(StackSpec::FooMiddleware)
end
end
describe '#insert_before' do
it 'inserts a middleware before another middleware class' do
expect { subject.insert_before StackSpec::FooMiddleware, StackSpec::BarMiddleware }
.to change(subject, :size).by(1)
expect(subject[0]).to eq(StackSpec::BarMiddleware)
expect(subject[1]).to eq(StackSpec::FooMiddleware)
end
it 'inserts a middleware before an anonymous class given by its superclass' do
subject.use Class.new(StackSpec::BlockMiddleware)
expect { subject.insert_before StackSpec::BlockMiddleware, StackSpec::BarMiddleware }
.to change(subject, :size).by(1)
expect(subject[1]).to eq(StackSpec::BarMiddleware)
expect(subject[2]).to eq(StackSpec::BlockMiddleware)
end
it 'raises an error on an invalid index' do
expect { subject.insert_before StackSpec::BlockMiddleware, StackSpec::BarMiddleware }
.to raise_error(RuntimeError, 'No such middleware to insert before: StackSpec::BlockMiddleware')
end
end
describe '#insert_after' do
it 'inserts a middleware after another middleware class' do
expect { subject.insert_after StackSpec::FooMiddleware, StackSpec::BarMiddleware }
.to change(subject, :size).by(1)
expect(subject[1]).to eq(StackSpec::BarMiddleware)
expect(subject[0]).to eq(StackSpec::FooMiddleware)
end
it 'inserts a middleware after an anonymous class given by its superclass' do
subject.use Class.new(StackSpec::BlockMiddleware)
expect { subject.insert_after StackSpec::BlockMiddleware, StackSpec::BarMiddleware }
.to change(subject, :size).by(1)
expect(subject[1]).to eq(StackSpec::BlockMiddleware)
expect(subject[2]).to eq(StackSpec::BarMiddleware)
end
it 'raises an error on an invalid index' do
expect { subject.insert_after StackSpec::BlockMiddleware, StackSpec::BarMiddleware }
.to raise_error(RuntimeError, 'No such middleware to insert after: StackSpec::BlockMiddleware')
end
end
describe '#merge_with' do
it 'applies a collection of operations and middlewares' do
expect { subject.merge_with(others) }
.to change(subject, :size).by(2)
expect(subject[0]).to eq(StackSpec::FooMiddleware)
expect(subject[1]).to eq(StackSpec::BlockMiddleware)
expect(subject[2]).to eq(StackSpec::BarMiddleware)
end
context 'middleware spec with proc declaration exists' do
let(:middleware_spec_with_proc) { [:use, StackSpec::FooMiddleware, proc] }
it 'properly forwards spec arguments' do
expect(subject).to receive(:use).with(StackSpec::FooMiddleware)
subject.merge_with([middleware_spec_with_proc])
end
end
end
describe '#build' do
it 'returns a rack builder instance' do
expect(subject.build).to be_instance_of(Rack::Builder)
end
context 'when @others are present' do
let(:others) { [[:insert_after, Grape::Middleware::Formatter, StackSpec::BarMiddleware]] }
it 'applies the middleware specs stored in @others' do
subject.concat others
subject.use Grape::Middleware::Formatter
subject.build
expect(subject[0]).to eq StackSpec::FooMiddleware
expect(subject[1]).to eq Grape::Middleware::Formatter
expect(subject[2]).to eq StackSpec::BarMiddleware
end
end
end
describe '#concat' do
it 'adds non :use specs to @others' do
expect { subject.concat others }.to change(subject, :others).from([]).to([[others.last]])
end
it 'calls +merge_with+ with the :use specs' do
expect(subject).to receive(:merge_with).with [[:use, StackSpec::BarMiddleware]]
subject.concat others
end
end
end
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