Some clean ups for caching tests.

pkg/analysis_server/test/index/lru_cache_test.dart

Index: pkg/analysis_server/test/index/lru_cache_test.dart
diff --git a/pkg/analysis_server/test/index/lru_cache_test.dart b/pkg/analysis_server/test/index/lru_cache_test.dart
index a1a448961ee0d8fce721bcdf1d5f47667b9c65a6..f397a5d49f11dc21d849eb86f4ce2981715b21bc 100644
--- a/pkg/analysis_server/test/index/lru_cache_test.dart
+++ b/pkg/analysis_server/test/index/lru_cache_test.dart
@@ -22,7 +22,7 @@ main() {
 class _LRUCacheTest {
   LRUCache<int, String> cache = new LRUCache<int, String>(3);
 
-  void test_evict() {
+  void test_evict_notGet() {
     List<int> evictedKeys = new List<int>();
     List<String> evictedValues = new List<String>();
     cache = new LRUCache<int, String>(3, (int key, String value) {
@@ -47,6 +47,31 @@ class _LRUCacheTest {
     expect(evictedValues, contains('B'));
   }
 
+  void test_evict_notPut() {
+    List<int> evictedKeys = new List<int>();
+    List<String> evictedValues = new List<String>();
+    cache = new LRUCache<int, String>(3, (int key, String value) {
+      evictedKeys.add(key);
+      evictedValues.add(value);
+    });
+    // fill
+    cache.put(1, 'A');
+    cache.put(2, 'B');
+    cache.put(3, 'C');
+    // put '1' and '3'
+    cache.put(1, 'AA');
+    cache.put(3, 'CC');
+    // put '4', evict '2'
+    cache.put(4, 'D');
+    expect(cache.get(1), 'AA');
+    expect(cache.get(2), isNull);
+    expect(cache.get(3), 'CC');
+    expect(cache.get(4), 'D');
+    // check eviction listener
+    expect(evictedKeys, contains(2));
+    expect(evictedValues, contains('B'));
+  }
+
   void test_putGet() {
     // fill
     cache.put(1, 'A');