third_party/WebKit/Source/platform/geometry/FloatPointTest.cpp

// Copyright 2015 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 "config.h"
#include "platform/geometry/FloatPoint.h"

#include "platform/geometry/GeometryTestHelpers.h"
#include <gtest/gtest.h>

namespace blink {

TEST(FloatPointTest, LengthTest)
{
    // Sanity check the Pythagorean triples 3-4-5 and 5-12-13
    FloatPoint p1 = FloatPoint(3.f, 4.f);
    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, p1.length(), 5.f);
    FloatPoint p2 = FloatPoint(5.f, 12.f);
    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, p2.length(), 13.f);

    // Test very small numbers. This fails under the old implementation of
    // FloatPoint::length(): `return sqrtf(lengthSquared());'
    FloatPoint p3 = FloatPoint(.5e-20f, .5e-20f);
    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, p3.length(), .707106781186548e-20f);

    // Test very large numbers.
    FloatPoint p4 = FloatPoint(.5e20f, .5e20f);
    EXPECT_PRED_FORMAT2(GeometryTest::AssertAlmostEqual, p4.length(), .707106781186548e20f);
}

} // namespace blink