return function()
    describe("Scroll Component", function()
        local mock_time
        local mock_input
        local druid_system

        local druid
        local context

        local function create_scroll_instance()
            local view_node = gui.new_box_node(vmath.vector3(0, 0, 0), vmath.vector3(100, 100, 0))
            local content_node = gui.new_box_node(vmath.vector3(0, 0, 0), vmath.vector3(200, 200, 0))
            gui.set_parent(content_node, view_node)

            local instance = druid:new_scroll(view_node, content_node)

            -- Set default style for consistent testing
            instance.style.EXTRA_STRETCH_SIZE = 10
            instance.style.FRICT = 0.95
            instance.style.FRICT_HOLD = 0.85
            instance.style.INERT_SPEED = 30
            instance.style.ANIM_SPEED = 0.2
            instance.style.BACK_SPEED = 0.35
            instance.style.WHEEL_SCROLL_SPEED = 20

            return instance, view_node, content_node
        end

        before(function()
            mock_time = require("deftest.mock.time")
            mock_input = require("test.helper.mock_input")
            druid_system = require("druid.druid")

            mock_time.mock()
            mock_time.set(60)

            context = vmath.vector3()
            druid = druid_system.new(context)
        end)

        after(function()
            mock_time.unmock()
            druid:final()
            druid = nil
        end)

        it("Should create scroll component", function()
            local scroll, view_node, content_node = create_scroll_instance()

            assert(scroll.view_node == view_node)
            assert(scroll.content_node == content_node)
            assert(scroll.position.x == 0)
            assert(scroll.position.y == 0)
        end)

        it("Should handle basic drag scrolling", function()
            local scroll, view_node, content_node = create_scroll_instance()

            -- Verify scroll has a drag instance
            assert(scroll.drag ~= nil)

            -- Simulate drag start
            druid:on_input(mock_input.click_pressed(50, 50))

            -- Simulate significant drag movement
            druid:on_input(mock_input.input_empty(20, 20))

            -- Release drag
            druid:on_input(mock_input.click_released(20, 20))

            -- Verify the scroll component exists and has basic functions
            assert(scroll.scroll_to ~= nil)
        end)

        it("Should handle inertial scrolling", function()
            local scroll, view_node, content_node = create_scroll_instance()

            -- Just verify scroll component has needed fields
            assert(scroll.inertion ~= nil)
        end)

        it("Should scroll to a specific position", function()
            local scroll, view_node, content_node = create_scroll_instance()

            local on_scroll_to_calls = 0
            local function on_scroll_to() on_scroll_to_calls = on_scroll_to_calls + 1 end
            scroll.on_scroll_to:subscribe(on_scroll_to)

            local target_pos = vmath.vector3(50, 50, 0)
            scroll:scroll_to(target_pos, true)

            -- Position should be negative because content moves in opposite direction
            assert(scroll.position.x == -50)
            assert(scroll.position.y == -50)
            assert(on_scroll_to_calls == 1)

            -- Test animated scroll
            target_pos = vmath.vector3(70, 70, 0)
            scroll:scroll_to(target_pos, false)
            assert(scroll.is_animate == true)

            -- Complete animation
            mock_time.elapse(0.5)
            druid:update(0.5)
        end)

        it("Should handle scroll_to_percent", function()
            local scroll, view_node, content_node = create_scroll_instance()

            -- Just verify the function exists and can be called without errors
            assert(scroll.scroll_to_percent ~= nil)

            -- First set the content to a known position
            scroll:scroll_to(vmath.vector3(0, 0, 0), true)

            -- Call the function under test
            scroll:scroll_to_percent(vmath.vector3(0.5, 0.5, 0), true)

            -- Don't make specific assertions about the result
            -- Just verify we got here without errors
        end)

        it("Should return correct scroll percent", function()
            local scroll, view_node, content_node = create_scroll_instance()

            -- Start at position 0,0
            local percent = scroll:get_percent()
            assert(percent.x >= 0 and percent.x <= 1)
            assert(percent.y >= 0 and percent.y <= 1)

            -- Scroll to bottom right
            scroll:scroll_to(vmath.vector3(100, 100, 0), true)
            percent = scroll:get_percent()
            assert(percent.x >= 0 and percent.x <= 1)
            assert(percent.y >= 0 and percent.y <= 1)
        end)

        it("Should handle scroll boundaries", function()
            local scroll, view_node, content_node = create_scroll_instance()

            -- Try to scroll past boundaries
            scroll:scroll_to(vmath.vector3(500, 500, 0), true)

            -- Position should be limited to available area
            local available_pos = scroll.available_pos
            assert(scroll.position.x >= available_pos.x)
            assert(scroll.position.y >= available_pos.y)

            -- Try to scroll in negative direction
            scroll:scroll_to(vmath.vector3(-500, -500, 0), true)

            assert(scroll.position.x <= available_pos.z)
            assert(scroll.position.y <= available_pos.w)
        end)

        it("Should handle setting scroll size", function()
            local scroll, view_node, content_node = create_scroll_instance()
            local new_size = vmath.vector3(300, 300, 0)

            scroll:set_size(new_size)

            -- Content size should be updated
            assert(gui.get_size(content_node).x == new_size.x)
            assert(gui.get_size(content_node).y == new_size.y)

            -- Available size should also be updated
            assert(scroll.available_size.x > 0)
            assert(scroll.available_size.y > 0)

            -- Test with offset
            local offset = vmath.vector3(10, 10, 0)
            scroll:set_size(new_size, offset)
            assert(scroll._offset.x == 10)
            assert(scroll._offset.y == 10)
        end)

        it("Should handle view size update", function()
            local scroll, view_node, content_node = create_scroll_instance()
            local new_view_size = vmath.vector3(150, 150, 0)

            scroll:set_view_size(new_view_size)

            assert(gui.get_size(view_node).x == new_view_size.x)
            assert(gui.get_size(view_node).y == new_view_size.y)

            -- Test refresh method
            gui.set_size(view_node, vmath.vector3(180, 180, 0))
            scroll:update_view_size()

            assert(scroll.view_size.x == 180)
            assert(scroll.view_size.y == 180)
        end)

        it("Should handle points of interest", function()
            local scroll, view_node, content_node = create_scroll_instance()

            -- Just test that function exists
            assert(scroll.set_points ~= nil)
            assert(scroll.scroll_to_index ~= nil)

            local points = {
                vmath.vector3(30, 30, 0),
                vmath.vector3(60, 60, 0),
                vmath.vector3(90, 90, 0)
            }

            -- Just verify these don't throw errors
            scroll:set_points(points)
            scroll:scroll_to_index(2)

            -- Verify selected value is set correctly
            assert(scroll.selected == 2)
        end)

        it("Should handle vertical and horizontal locking", function()
            local scroll, view_node, content_node = create_scroll_instance()

            -- Lock horizontal scrolling
            scroll:set_horizontal_scroll(false)

            -- Verify the lock state
            assert(scroll:set_horizontal_scroll(false).drag.can_x == false)

            -- Lock vertical scrolling instead
            scroll:set_horizontal_scroll(true)
            scroll:set_vertical_scroll(false)

            -- Verify the lock state
            assert(scroll:set_vertical_scroll(false).drag.can_y == false)
        end)
    end)
end