Make our raw/ tests actually check the paint output.

sky/tests/resources/display_list.dart

Index: sky/tests/resources/display_list.dart
diff --git a/sky/tests/resources/display_list.dart b/sky/tests/resources/display_list.dart
new file mode 100644
index 0000000000000000000000000000000000000000..67a1ef7c7a0e80bf6ec2879a426c3dea33bb8f27
--- /dev/null
+++ b/sky/tests/resources/display_list.dart
@@ -0,0 +1,145 @@
+
+import 'package:sky/framework/rendering/render_node.dart';
+import 'package:sky/framework/rendering/render_box.dart';
+import 'dart:sky' as sky;
+
+typedef void Logger (String s);
+
+class TestDisplayList extends RenderNodeDisplayList {
+  TestDisplayList(double width, double height, this.logger, { this.indent: '' }) :
+    this.width = width,
+    this.height = height,
+    super(width, height) {
+    log("TestDisplayList() constructor: $width x $height");
+  }
+
+  final String indent;
+  final double width;
+  final double height;
+
+  Logger logger;
+  void log(String s) {
+    logger("${indent} ${s}");
+  }
+
+  String explainPaint(sky.Paint paint) {
+    return "Paint(0x${paint.color.toRadixString(16).padLeft(8, '0')})";
+  }
+
+  void save() {
+    log("save");
+  }
+
+  void saveLayer(sky.Rect bounds, sky.Paint paint) {
+    log("saveLayer(${bounds.top}:${bounds.left}:${bounds.bottom}:${bounds.right}, ${explainPaint(paint)})");
+  }
+
+  void restore() {
+    log("restore");
+  }
+
+  void translate(double dx, double dy) {
+    log("translate($dx, $dy)");
+  }
+
+  void scale(double sx, double sy) {
+    log("scale($sx, $sy)");
+  }
+
+  void rotateDegrees(double degrees) {
+    log("rotateDegrees($degrees)");
+  }
+
+  void skew(double sx, double sy) {
+    log("skew($sx, $sy)");
+  }
+
+  void concat(List<double> matrix9) {
+    log("concat($matrix9)");
+  }
+
+  void clipRect(sky.Rect rect) {
+    log("clipRect(${rect.top}:${rect.left}:${rect.bottom}:${rect.right})");
+  }
+
+  void drawPicture(sky.Picture picture) {
+    log("drawPicture()");
+  }
+
+  void drawPaint(sky.Paint paint) {
+    log("drawPaint(${explainPaint(paint)})");
+  }
+
+  void drawRect(sky.Rect rect, sky.Paint paint) {
+    log("drawRect(${rect.top}:${rect.left}:${rect.bottom}:${rect.right}, ${explainPaint(paint)})");
+  }
+
+  void drawOval(sky.Rect rect, sky.Paint paint) {
+    log("drawOval(${rect.top}:${rect.left}:${rect.bottom}:${rect.right}, ${explainPaint(paint)})");
+  }
+
+  void drawCircle(double x, double y, double radius, sky.Paint paint) {
+    log("drawCircle($x, $y, $radius, ${explainPaint(paint)})");
+  }
+
+  void drawPath(sky.Path path, sky.Paint paint) {
+    log("drawPath(Path, ${explainPaint(paint)})");
+  }
+
+  void paintChild(RenderNode child, sky.Point position) {
+    log("paintChild at ${position.x},${position.y}");
+    child.paint(new TestDisplayList(width, height, logger, indent: "$indent  |"));
+  }
+}
+
+class TestView extends RenderView {
+
+  TestView({
+    RenderBox child,
+    Duration timeForRotation
+  }) : super(child: child, timeForRotation: timeForRotation) {
+    print("TestView enabled");
+  }
+
+  int frame = 0;
+
+  String lastPaint = '';
+  void log(String s) {
+    lastPaint += "\n$s";
+  }
+
+  void paintFrame() {
+    RenderNode.debugDoingPaint = true;
+    frame += 1;
+    log("PAINT FOR FRAME #${frame} ----------------------------------------------");
+    var canvas = new TestDisplayList(sky.view.width, sky.view.height, log, indent: "${frame} |");
+    paint(canvas);
+    log("------------------------------------------------------------------------");
+    RenderNode.debugDoingPaint = false;
+  }
+
+}
+
+class TestApp {
+
+  TestApp(RenderBox root) {
+    _renderView = new TestView(child: root);
+    _renderView.attach();
+    _renderView.layout(new ViewConstraints(width: sky.view.width, height: sky.view.height));
+    _renderView.paintFrame();
+    print(_renderView.lastPaint); // TODO(ianh): figure out how to make this fit the unit testing framework better
+  }
+
+  RenderView _renderView;
+
+  RenderBox get root => _renderView.child;
+  void set root(RenderBox value) {
+    _renderView.child = value;
+  }
+  void _beginFrame(double timeStamp) {
+    RenderNode.flushLayout();
+    _renderView.paintFrame();
+    print(_renderView.lastPaint); // TODO(ianh): figure out how to make this fit the unit testing framework better
+  }
+
+}