src/android/tests/src/com/google/android/inputmethod/japanese/util/LeastRecentlyUsedCacheMapTest.java

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package org.mozc.android.inputmethod.japanese.util;

import junit.framework.TestCase;

import java.util.Map;

/**
 */
public class LeastRecentlyUsedCacheMapTest extends TestCase {
  public void testLeastRecentlyUsedCacheMap() {
    // Set max entry size to 5.
    Map<Integer, Integer> cacheMap = new LeastRecentlyUsedCacheMap<Integer, Integer>(5);

    // Put 0, 1, 2, 3 and 4 to the map.
    for (int i = 0; i < 5; ++i) {
      assertEquals(i, cacheMap.size());
      cacheMap.put(i, i);
      assertEquals(i + 1, cacheMap.size());
    }

    // Look up each element.
    for (int i = 0; i < 5; ++i) {
      assertEquals(Integer.valueOf(i), cacheMap.get(i));
    }

    // Put 5 to the map. Then 0, which is least recently used element, should be removed.
    cacheMap.put(5, 5);
    assertEquals(5, cacheMap.size());
    assertFalse(cacheMap.containsKey(0));

    // Then access 5, 4, 3, 2 and 1.
    for (int i = 5; i >= 1; --i) {
      assertEquals(Integer.valueOf(i), cacheMap.get(i));
    }

    // Put 6 to the map, then 5, which is least recently used element here, should be removed.
    cacheMap.put(6, 6);
    assertEquals(5, cacheMap.size());
    assertFalse(cacheMap.containsKey(5));
  }
}