test/UnitTests/LruCacheTest.cpp

   1 // TortoiseGit - a Windows shell extension for easy version control
   2
   3 // Copyright (C) 2016 - TortoiseGit
   4 // Copyright (C) 2016 - TortoiseSVN
   5
   6 // This program is free software; you can redistribute it and/or
   7 // modify it under the terms of the GNU General Public License
   8 // as published by the Free Software Foundation; either version 2
   9 // of the License, or (at your option) any later version.
  10
  11 // This program is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License
  17 // along with this program; if not, write to the Free Software Foundation,
  18 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 //
  20
  21 #include "stdafx.h"
  22 #include "LruCache.h"
  23
  24 TEST(LruCache, InsertGet)
  25 {
  26         LruCache<int, int> cache(2);
  27         cache.insert_or_assign(1, 100);
  28         cache.insert_or_assign(2, 200);
  29         // Emulate access to key '1'
  30         cache.try_get(1);
  31
  32         // Add third entry. Key '2' should be evicted/
  33         cache.insert_or_assign(3, 300);
  34
  35         EXPECT_NE(nullptr, cache.try_get(1));
  36         EXPECT_EQ(100, *cache.try_get(1));
  37
  38         EXPECT_EQ(nullptr, cache.try_get(2));
  39
  40         EXPECT_NE(nullptr, cache.try_get(3));
  41         EXPECT_EQ(300, *cache.try_get(3));
  42
  43         // Test LruCache.clear()
  44         cache.clear();
  45         EXPECT_EQ(nullptr, cache.try_get(1));
  46         EXPECT_EQ(nullptr, cache.try_get(2));
  47         EXPECT_EQ(nullptr, cache.try_get(3));
  48
  49         cache.insert_or_assign(1, 100);
  50         cache.insert_or_assign(3, 300);
  51
  52         EXPECT_NE(nullptr, cache.try_get(1));
  53         EXPECT_EQ(100, *cache.try_get(1));
  54         EXPECT_NE(nullptr, cache.try_get(3));
  55         EXPECT_EQ(300, *cache.try_get(3));
  56
  57         // Replace value associated with key '1'.
  58         cache.insert_or_assign(1, 101);
  59         EXPECT_NE(nullptr, cache.try_get(1));
  60
  61         EXPECT_EQ(101, *cache.try_get(1));
  62         EXPECT_NE(nullptr, cache.try_get(3));
  63         EXPECT_EQ(300, *cache.try_get(3));
  64 }
  65
  66 TEST(LruCache, EmptyCache)
  67 {
  68         LruCache<int, int> cache(5);
  69         EXPECT_EQ(nullptr, cache.try_get(1));
  70         EXPECT_EQ(nullptr, cache.try_get(2));
  71         EXPECT_EQ(nullptr, cache.try_get(3));
  72 }