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# frozen_string_literal: true
require "abstract_unit"
class MiddlewareStackTest < ActiveSupport::TestCase
class Base
def initialize(app)
@app = app
end
def call(env)
@app.call(env)
end
end
class FooMiddleware < Base; end
class BarMiddleware < Base; end
class BazMiddleware < Base; end
class HiyaMiddleware < Base; end
class BlockMiddleware < Base
attr_reader :block
def initialize(app, &block)
super(app)
@block = block
end
end
def setup
@stack = ActionDispatch::MiddlewareStack.new
@stack.use FooMiddleware
@stack.use BarMiddleware
end
def test_delete_works
assert_difference "@stack.size", -1 do
@stack.delete FooMiddleware
end
end
test "use should push middleware as class onto the stack" do
assert_difference "@stack.size" do
@stack.use BazMiddleware
end
assert_equal BazMiddleware, @stack.last.klass
end
test "use should push middleware class with arguments onto the stack" do
assert_difference "@stack.size" do
@stack.use BazMiddleware, true, foo: "bar"
end
assert_equal BazMiddleware, @stack.last.klass
assert_equal([true, { foo: "bar" }], @stack.last.args)
end
test "use should push middleware class with block arguments onto the stack" do
proc = Proc.new { }
assert_difference "@stack.size" do
@stack.use(BlockMiddleware, &proc)
end
assert_equal BlockMiddleware, @stack.last.klass
assert_equal proc, @stack.last.block
end
test "insert inserts middleware at the integer index" do
@stack.insert(1, BazMiddleware)
assert_equal BazMiddleware, @stack[1].klass
end
test "insert_after inserts middleware after the integer index" do
@stack.insert_after(1, BazMiddleware)
assert_equal BazMiddleware, @stack[2].klass
end
test "insert_before inserts middleware before another middleware class" do
@stack.insert_before(BarMiddleware, BazMiddleware)
assert_equal BazMiddleware, @stack[1].klass
end
test "insert_after inserts middleware after another middleware class" do
@stack.insert_after(BarMiddleware, BazMiddleware)
assert_equal BazMiddleware, @stack[2].klass
end
test "swaps one middleware out for another" do
assert_equal FooMiddleware, @stack[0].klass
@stack.swap(FooMiddleware, BazMiddleware)
assert_equal BazMiddleware, @stack[0].klass
end
test "swaps one middleware out for same middleware class" do
assert_equal FooMiddleware, @stack[0].klass
@stack.swap(FooMiddleware, FooMiddleware, Proc.new { |env| [500, {}, ["error!"]] })
assert_equal FooMiddleware, @stack[0].klass
end
test "unshift adds a new middleware at the beginning of the stack" do
@stack.unshift MiddlewareStackTest::BazMiddleware
assert_equal BazMiddleware, @stack.first.klass
end
test "raise an error on invalid index" do
assert_raise RuntimeError do
@stack.insert(HiyaMiddleware, BazMiddleware)
end
assert_raise RuntimeError do
@stack.insert_after(HiyaMiddleware, BazMiddleware)
end
end
test "can check if Middleware are equal - Class" do
assert_equal @stack.last, BarMiddleware
end
test "includes a class" do
assert_equal true, @stack.include?(BarMiddleware)
end
test "can check if Middleware are equal - Middleware" do
assert_equal @stack.last, @stack.last
end
test "instruments the execution of middlewares" do
events = []
subscriber = proc do |*args|
events << ActiveSupport::Notifications::Event.new(*args)
end
ActiveSupport::Notifications.subscribed(subscriber, "process_middleware.action_dispatch") do
app = @stack.build(proc { |env| [200, {}, []] })
env = {}
app.call(env)
end
assert_equal 2, events.count
assert_equal ["MiddlewareStackTest::BarMiddleware", "MiddlewareStackTest::FooMiddleware"], events.map { |e| e.payload[:middleware] }
end
test "includes a middleware" do
assert_equal true, @stack.include?(ActionDispatch::MiddlewareStack::Middleware.new(BarMiddleware, nil, nil))
end
end
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