コード例 #1
0
        public void GetOrAdd_DisposesReleasedReferencesOnExpand()
        {
            // Arrange
            var cache = new StringCache(2);

            // Act
            StringArea();

            // Force a collection
            GC.Collect();
            var str1   = $"{1}";
            var result = cache.GetOrAddValue(str1);

            // Assert
            Assert.Equal(1, cache.ApproximateSize);
            Assert.Same(result, str1);

            void StringArea()
            {
                var first = $"{1}";
                var test  = cache.GetOrAddValue(first);

                Assert.Same(first, test);
                Assert.Equal(1, cache.ApproximateSize);
                GC.KeepAlive(first);
            }
        }
コード例 #2
0
        public void GetOrAdd_NullReturnsNull()
        {
            // Arrange
            var cache = new StringCache();

            // Act & Assert
            Assert.Throws <ArgumentNullException>(() => cache.GetOrAddValue(null));
        }
コード例 #3
0
        public void GetOrAdd_EquivilentStrings_RetrievesFirstReference()
        {
            // Arrange
            var cache = new StringCache();
            // String format to prevent them from being RefEqual
            var str1 = $"stuff {1}";
            var str2 = $"stuff {1}";

            // Sanity check that these aren't already equal
            Assert.False(ReferenceEquals(str1, str2));

            // Act
            // Force a colleciton
            _ = cache.GetOrAddValue(str1);
            GC.Collect();
            var result = cache.GetOrAddValue(str2);

            // Assert
            Assert.Same(result, str1);
            Assert.False(ReferenceEquals(result, str2));
        }