add: necessary assert statement; rem: unnecessary render resize in testing

src/element.zig

@@ -203,6 +203,7 @@ pub fn Scrollable(Event: type) type {
 
         fn content(ctx: *anyopaque, cells: []Cell, size: Point) !void {
             const this: *@This() = @ptrCast(@alignCast(ctx));
+            assert(cells.len == @as(usize, size.x) * @as(usize, size.y));
             assert(cells.len == @as(usize, this.size.x) * @as(usize, this.size.y));
             const offset_x: usize = if (this.configuration.x_axis) 1 else 0;
             const offset_y: usize = if (this.configuration.y_axis) 1 else 0;

src/testing.zig

@@ -109,7 +109,6 @@ pub fn expectContainerScreen(size: Point, container: *Container(event.SystemEven
     var renderer: Renderer = .init(allocator, size);
     defer renderer.deinit();
 
-    try renderer.resize(size);
     container.resize(size);
     container.reposition(.{});
     try renderer.render(Container(event.SystemEvent), container);