Migrate RenderBox tests to box_test.dart

packages/unit/test/rendering/box_test.dart

+import 'package:sky/rendering.dart';
+import 'package:sky/theme/colors.dart' as colors;
+import 'package:sky/theme/shadows.dart';
+import 'package:test/test.dart';
+
+import 'layout_utils.dart';
+
+void main() {
+  test("should size to render view", () {
+    RenderBox root = new RenderDecoratedBox(
+      decoration: new BoxDecoration(
+        backgroundColor: const Color(0xFF00FF00),
+        gradient: new RadialGradient(
+          center: Point.origin, radius: 500.0,
+          colors: [colors.Yellow[500], colors.Blue[500]]),
+        boxShadow: shadows[3])
+    );
+    layout(root);
+    expect(root.size.width, equals(800.0));
+    expect(root.size.height, equals(600.0));
+  });
+
+  test('Flex and padding', () {
+    RenderBox size = new RenderConstrainedBox(
+      additionalConstraints: new BoxConstraints().applyHeight(100.0)
+    );
+    RenderBox inner = new RenderDecoratedBox(
+      decoration: new BoxDecoration(
+        backgroundColor: const Color(0xFF00FF00)
+      ),
+      child: size
+    );
+    RenderBox padding = new RenderPadding(
+      padding: new EdgeDims.all(50.0),
+      child: inner
+    );
+    RenderBox flex = new RenderFlex(
+      children: [padding],
+      direction: FlexDirection.vertical,
+      alignItems: FlexAlignItems.stretch
+    );
+    RenderBox outer = new RenderDecoratedBox(
+      decoration: new BoxDecoration(
+        backgroundColor: const Color(0xFF0000FF)
+      ),
+      child: flex
+    );
+
+    layout(outer);
+
+    expect(size.size.width, equals(700.0));
+    expect(size.size.height, equals(100.0));
+    expect(inner.size.width, equals(700.0));
+    expect(inner.size.height, equals(100.0));
+    expect(padding.size.width, equals(800.0));
+    expect(padding.size.height, equals(200.0));
+    expect(flex.size.width, equals(800.0));
+    expect(flex.size.height, equals(600.0));
+    expect(outer.size.width, equals(800.0));
+    expect(outer.size.height, equals(600.0));
+  });
+
+  test("should not have a 0 sized colored Box", () {
+    var coloredBox = new RenderDecoratedBox(
+      decoration: new BoxDecoration()
+    );
+    var paddingBox = new RenderPadding(padding: const EdgeDims.all(10.0),
+        child: coloredBox);
+    RenderBox root = new RenderDecoratedBox(
+      decoration: new BoxDecoration(),
+      child: paddingBox
+    );
+    layout(root);
+    expect(coloredBox.size.width, equals(780.0));
+    expect(coloredBox.size.height, equals(580.0));
+  });
+}