[layoutng] Create correct constraint spaces for children

third_party/WebKit/Source/core/layout/ng/ng_length_utils_test.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/ng/ng_length_utils.h"
 
 #include "core/layout/ng/ng_constraint_space.h"
 #include "core/layout/ng/ng_units.h"
 #include "core/style/ComputedStyle.h"
 #include "platform/CalculationValue.h"
@@ skipping 116 matching lines @@
   style_->setMarginRight(Length(20, Fixed));
   EXPECT_EQ(LayoutUnit(180), computeInlineSizeForFragment());
 
   style_->setLogicalWidth(Length(100, Fixed));
   style_->setPaddingLeft(Length(50, Fixed));
   EXPECT_EQ(LayoutUnit(150), computeInlineSizeForFragment());
 
   style_->setBoxSizing(BoxSizingBorderBox);
   EXPECT_EQ(LayoutUnit(100), computeInlineSizeForFragment());
 
+  // Content size should never be below zero, even with box-sizing: border-box
+  // and a large padding...
+  style_->setPaddingLeft(Length(400, Fixed));
+  EXPECT_EQ(LayoutUnit(400), computeInlineSizeForFragment());
+
+  // ...and the same goes for fill-available with a large padding.
+  style_->setLogicalWidth(Length(FillAvailable));
+  EXPECT_EQ(LayoutUnit(400), computeInlineSizeForFragment());
+
   // TODO(layout-ng): test {min,max}-content on max-width.
 }
 
 TEST_F(NGLengthUtilsTest, testComputeBlockSizeForFragment) {
   style_->setLogicalHeight(Length(30, Percent));
   EXPECT_EQ(LayoutUnit(90), computeBlockSizeForFragment());
 
   style_->setLogicalHeight(Length(150, Fixed));
   EXPECT_EQ(LayoutUnit(150), computeBlockSizeForFragment());
 
@@ skipping 30 matching lines @@
   style_->setLogicalHeight(Length(FillAvailable));
   EXPECT_EQ(LayoutUnit(280), computeBlockSizeForFragment());
 
   style_->setLogicalHeight(Length(100, Fixed));
   style_->setPaddingBottom(Length(50, Fixed));
   EXPECT_EQ(LayoutUnit(150), computeBlockSizeForFragment());
 
   style_->setBoxSizing(BoxSizingBorderBox);
   EXPECT_EQ(LayoutUnit(100), computeBlockSizeForFragment());
 
+  // Content size should never be below zero, even with box-sizing: border-box
+  // and a large padding...
+  style_->setPaddingBottom(Length(400, Fixed));
+  EXPECT_EQ(LayoutUnit(400), computeBlockSizeForFragment());
+
+  // ...and the same goes for fill-available with a large padding.
+  style_->setLogicalHeight(Length(FillAvailable));
+  EXPECT_EQ(LayoutUnit(400), computeBlockSizeForFragment());
+
   // TODO(layout-ng): test {min,max}-content on max-height.
 }
 
 TEST_F(NGLengthUtilsTest, testIndefinitePercentages) {
   style_->setMinHeight(Length(20, Fixed));
   style_->setHeight(Length(20, Percent));
 
   EXPECT_EQ(NGSizeIndefinite,
             computeBlockSizeForFragment(ConstructConstraintSpace(200, -1),
                                         LayoutUnit(-1)));
@@ skipping 53 matching lines @@
   NGBoxStrut padding = computePadding(*constraintSpace, *style_);
 
   EXPECT_EQ(LayoutUnit(52), padding.block_start);
   EXPECT_EQ(LayoutUnit(), padding.inline_end);
   EXPECT_EQ(LayoutUnit(22), padding.block_end);
   EXPECT_EQ(LayoutUnit(20), padding.inline_start);
 }
 
 }  // namespace
 }  // namespace blink