Page zoom improvements

content/public/common/page_zoom_unittest.cc

+// Copyright (c) 2011 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 "content/public/common/page_zoom.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+TEST(PageZoomTest, ZoomValuesEqual) {
+  // Test two identical values.
+  EXPECT_TRUE(content::ZoomValuesEqual(1.5, 1.5));
+
+  // Test two values that are close enough to be considered equal.
+  EXPECT_TRUE(content::ZoomValuesEqual(1.5, 1.49999999));
+
+  // Test two values that are close, but should not be considered equal.
+  EXPECT_FALSE(content::ZoomValuesEqual(1.5, 1.4));
+}
+
+TEST(PageZoomTest, PresetZoomFactors) {
+  // Fetch a vector of preset zoom factors, including a custom value that we
+  // already know is not going to be in the list.
+  double custom_value = 1.05;  // 105%
+  std::vector<double> factors = content::PresetZoomFactors(custom_value);
+
+  // Expect at least 10 zoom factors.
+  EXPECT_GE(factors.size(), 10U);
+
+  // Expect the first and last items to match the minimum and maximum values.
+  EXPECT_DOUBLE_EQ(factors.front(), content::kMinimumZoomFactor);
+  EXPECT_DOUBLE_EQ(factors.back(), content::kMaximumZoomFactor);
+
+  // Iterate through the vector, with the following checks:
+  // 1. The values are in sorted order.
+  // 2. The custom value is exists.
+  // 3. The 100% value exists.
+  bool found_custom_value = false;
+  bool found_100_percent = false;
+  double last_value = 0;
+
+  std::vector<double>::const_iterator i;
+  for (i = factors.begin(); i != factors.end(); ++i) {
+    double factor = *i;
+    EXPECT_GT(factor, last_value);
+    if (content::ZoomValuesEqual(factor, custom_value))
+      found_custom_value = true;
+    if (content::ZoomValuesEqual(factor, 1.0))
+      found_100_percent = true;
+    last_value = factor;
+  }
+
+  EXPECT_TRUE(found_custom_value);
+  EXPECT_TRUE(found_100_percent);
+}
+
+TEST(PageZoomTest, PresetZoomLevels) {
+  // Fetch a vector of preset zoom levels, including a custom value that we
+  // already know is not going to be in the list.
+  double custom_value = 0.1;
+  std::vector<double> levels = content::PresetZoomLevels(custom_value);
+
+  // Expect at least 10 zoom levels.
+  EXPECT_GE(levels.size(), 10U);
+
+  // Iterate through the vector, with the following checks:
+  // 1. The values are in sorted order.
+  // 2. The custom value is exists.
+  // 3. The 100% value exists.
+  bool found_custom_value = false;
+  bool found_100_percent = false;
+  double last_value = -99;
+
+  std::vector<double>::const_iterator i;
+  for (i = levels.begin(); i != levels.end(); ++i) {
+    double level = *i;
+    EXPECT_GT(level, last_value);
+    if (content::ZoomValuesEqual(level, custom_value))
+      found_custom_value = true;
+    if (content::ZoomValuesEqual(level, 0))
+      found_100_percent = true;
+    last_value = level;
+  }
+
+  EXPECT_TRUE(found_custom_value);
+  EXPECT_TRUE(found_100_percent);
+}
+
+TEST(PageZoomTest, InvalidCustomFactor) {
+  double too_low = 0.01;
+  std::vector<double> factors = content::PresetZoomFactors(too_low);
+  EXPECT_FALSE(content::ZoomValuesEqual(factors.front(), too_low));
+
+  double too_high = 99.0;
+  factors = content::PresetZoomFactors(too_high);
+  EXPECT_FALSE(content::ZoomValuesEqual(factors.back(), too_high));
+}
+
+TEST(PageZoomTest, InvalidCustomLevel) {
+  double too_low = -99.0;
+  std::vector<double> levels = content::PresetZoomLevels(too_low);
+  EXPECT_FALSE(content::ZoomValuesEqual(levels.front(), too_low));
+
+  double too_high = 99.0;
+  levels = content::PresetZoomLevels(too_high);
+  EXPECT_FALSE(content::ZoomValuesEqual(levels.back(), too_high));
+}
+