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);
}
}
public void GetOrAdd_NullReturnsNull()
{
// Arrange
var cache = new StringCache();
// Act & Assert
Assert.Throws <ArgumentNullException>(() => cache.GetOrAddValue(null));
}
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));
}