components/ui/zoom/page_zoom_unittests.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "components/ui/zoom/page_zoom.h"
   6 #include "content/public/common/page_zoom.h"
   7 #include "testing/gtest/include/gtest/gtest.h"
   8
   9 TEST(PageTestZoom, PresetZoomFactors) {
  10   // Fetch a vector of preset zoom factors, including a custom value that we
  11   // already know is not going to be in the list.
  12   double custom_value = 1.05;  // 105%
  13   std::vector<double> factors =
  14       ui_zoom::PageZoom::PresetZoomFactors(custom_value);
  15
  16   // Expect at least 10 zoom factors.
  17   EXPECT_GE(factors.size(), 10U);
  18
  19   // Expect the first and last items to match the minimum and maximum values.
  20   EXPECT_DOUBLE_EQ(factors.front(), content::kMinimumZoomFactor);
  21   EXPECT_DOUBLE_EQ(factors.back(), content::kMaximumZoomFactor);
  22
  23   // Iterate through the vector, with the following checks:
  24   // 1. The values are in sorted order.
  25   // 2. The custom value is exists.
  26   // 3. The 100% value exists.
  27   bool found_custom_value = false;
  28   bool found_100_percent = false;
  29   double last_value = 0;
  30
  31   std::vector<double>::const_iterator i;
  32   for (i = factors.begin(); i != factors.end(); ++i) {
  33     double factor = *i;
  34     EXPECT_GT(factor, last_value);
  35     if (content::ZoomValuesEqual(factor, custom_value))
  36       found_custom_value = true;
  37     if (content::ZoomValuesEqual(factor, 1.0))
  38       found_100_percent = true;
  39     last_value = factor;
  40   }
  41
  42   EXPECT_TRUE(found_custom_value);
  43   EXPECT_TRUE(found_100_percent);
  44 }
  45
  46 TEST(PageTestZoom, PresetZoomLevels) {
  47   // Fetch a vector of preset zoom levels, including a custom value that we
  48   // already know is not going to be in the list.
  49   double custom_value = 0.1;
  50   std::vector<double> levels =
  51       ui_zoom::PageZoom::PresetZoomLevels(custom_value);
  52
  53   // Expect at least 10 zoom levels.
  54   EXPECT_GE(levels.size(), 10U);
  55
  56   // Iterate through the vector, with the following checks:
  57   // 1. The values are in sorted order.
  58   // 2. The custom value is exists.
  59   // 3. The 100% value exists.
  60   bool found_custom_value = false;
  61   bool found_100_percent = false;
  62   double last_value = -99;
  63
  64   std::vector<double>::const_iterator i;
  65   for (i = levels.begin(); i != levels.end(); ++i) {
  66     double level = *i;
  67     EXPECT_GT(level, last_value);
  68     if (content::ZoomValuesEqual(level, custom_value))
  69       found_custom_value = true;
  70     if (content::ZoomValuesEqual(level, 0))
  71       found_100_percent = true;
  72     last_value = level;
  73   }
  74
  75   EXPECT_TRUE(found_custom_value);
  76   EXPECT_TRUE(found_100_percent);
  77 }
  78
  79 TEST(PageTestZoom, InvalidCustomFactor) {
  80   double too_low = 0.01;
  81   std::vector<double> factors = ui_zoom::PageZoom::PresetZoomFactors(too_low);
  82   EXPECT_FALSE(content::ZoomValuesEqual(factors.front(), too_low));
  83
  84   double too_high = 99.0;
  85   factors = ui_zoom::PageZoom::PresetZoomFactors(too_high);
  86   EXPECT_FALSE(content::ZoomValuesEqual(factors.back(), too_high));
  87 }
  88
  89 TEST(PageTestZoom, InvalidCustomLevel) {
  90   double too_low = -99.0;
  91   std::vector<double> levels = ui_zoom::PageZoom::PresetZoomLevels(too_low);
  92   EXPECT_FALSE(content::ZoomValuesEqual(levels.front(), too_low));
  93
  94   double too_high = 99.0;
  95   levels = ui_zoom::PageZoom::PresetZoomLevels(too_high);
  96   EXPECT_FALSE(content::ZoomValuesEqual(levels.back(), too_high));
  97 }
  98