public void Add_ThrowsIfKeyExists()
{
// Arrange
var input = GetKeyValueArray(Enumerable.Range(1, 3));
var cache = new ConcurrentLruCache <int, int>(input);
// Act & Assert
var exception = Assert.Throws <ArgumentException>(() => cache.Add(1, 1));
Assert.StartsWith("Key already exists", exception.Message);
}
public void Remove_KeyNotFound_ReturnsFalse()
{
// Arrange
var input = GetKeyValueArray(Enumerable.Range(1, 3));
var cache = new ConcurrentLruCache <int, int>(input);
// Act
var result = cache.Remove(4);
// Assert
Assert.False(result);
}
public void ConcurrentLruCache_HoldsCapacity()
{
// Arrange
var input = GetKeyValueArray(Enumerable.Range(1, 3));
var expected = input.Reverse();
// Act
var cache = new ConcurrentLruCache <int, int>(input);
// Assert
Assert.Equal(expected, cache.TestingEnumerable);
}
public void Add_NoRead_EvictsLastNode()
{
// Arrange
var input = GetKeyValueArray(Enumerable.Range(1, 3));
var expected = GetKeyValueArray(Enumerable.Range(2, 3)).Reverse();
var cache = new ConcurrentLruCache <int, int>(input);
// Act
cache.Add(4, 4);
// Assert
Assert.Equal(expected, cache.TestingEnumerable);
}
public void GetOrAdd_AddsIfKeyDoesNotExist()
{
// Arrange
var input = GetKeyValueArray(Enumerable.Range(1, 3));
var expected = GetKeyValueArray(Enumerable.Range(2, 3)).Reverse();
var cache = new ConcurrentLruCache <int, int>(input);
// Act
cache.GetOrAdd(4, 4);
// Assert
Assert.Equal(expected, cache.TestingEnumerable);
}
public void Remove_RemovesEntry()
{
// Arrange
var input = GetKeyValueArray(Enumerable.Range(1, 3));
var expected = GetKeyValueArray(Enumerable.Range(1, 2)).Reverse();
var cache = new ConcurrentLruCache <int, int>(input);
// Act
var result = cache.Remove(3);
// Assert
Assert.True(result);
Assert.Equal(expected, cache.TestingEnumerable);
}
public void Add_ReadLastNode_EvictsSecondOldestNode()
{
// Arrange
var input = GetKeyValueArray(Enumerable.Range(1, 3));
var expected = GetKeyValueArray(new int[] { 4, 1, 3 });
var cache = new ConcurrentLruCache <int, int>(input);
// Act
cache.GetOrAdd(1, 1); // Read to make this MRU
cache.Add(4, 4); // Add a new node
// Assert
Assert.Equal(expected, cache.TestingEnumerable);
}
