[layoutng] Add a basic unit test for NGBlockLayoutAlgorithm

third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm_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_block_layout_algorithm.h"
+
+#include "core/layout/ng/ng_box.h"
+#include "core/layout/ng/ng_constraint_space.h"
+#include "core/layout/ng/ng_fragment.h"
+#include "core/style/ComputedStyle.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+namespace {
+
+class NGBlockLayoutAlgorithmTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    style_ = ComputedStyle::create();
+  }
+
+  RefPtr<ComputedStyle> style_;
+};
+
+TEST_F(NGBlockLayoutAlgorithmTest, FixedSize) {
+  style_->setWidth(Length(30, Fixed));
+  style_->setHeight(Length(40, Fixed));
+
+  NGConstraintSpace space(LayoutUnit(100), LayoutUnit(-1));
+
+  NGBlockLayoutAlgorithm algorithm(style_, NGBox(nullptr));
+  NGFragment* frag = algorithm.layout(space);
+  EXPECT_EQ(frag->inlineSize(), LayoutUnit(30));
+  EXPECT_EQ(frag->blockSize(), LayoutUnit(40));
+}
+
+}  // namespace
+}  // namespace blink