require 'abstract_unit' class MiddlewareStackTest < ActiveSupport::TestCase class FooMiddleware; end class BarMiddleware; end class BazMiddleware; end class BlockMiddleware attr_reader :block def initialize(&block) @block = block end end def setup @stack = ActionDispatch::MiddlewareStack.new @stack.use FooMiddleware @stack.use BarMiddleware 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 as a string onto the stack" do assert_difference "@stack.size" do @stack.use "MiddlewareStackTest::BazMiddleware" end assert_equal BazMiddleware, @stack.last.klass end test "use should push middleware as a symbol onto the stack" do assert_difference "@stack.size" do @stack.use :"MiddlewareStackTest::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 "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 "lazy evaluates middleware class" do assert_difference "@stack.size" do @stack.use "MiddlewareStackTest::BazMiddleware" end assert_equal BazMiddleware, @stack.last.klass end test "lazy compares so unloaded constants are not loaded" do @stack.use "UnknownMiddleware" @stack.use :"MiddlewareStackTest::BazMiddleware" assert @stack.include?("::MiddlewareStackTest::BazMiddleware") end end