public void DifferentStringsDifferentDocuments()
{
ProjectStringCache cache = new ProjectStringCache();
XmlDocument document = new XmlDocument();
string stringToAdd = "Test1";
cache.Add(stringToAdd, document);
Assert.Equal(1, cache.Count);
stringToAdd = "Test2";
XmlDocument document2 = new XmlDocument();
string return2 = cache.Add(stringToAdd, document2);
// The second string gets its own instance.
Assert.Equal(2, cache.Count);
// Build a new string guaranteed not to be optimized by the compiler into the same instance.
StringBuilder builder = new StringBuilder();
builder.Append("Test");
builder.Append('2');
XmlDocument document3 = new XmlDocument();
string return3 = cache.Add(builder.ToString(), document3);
// The new string should be the same as the other one already in the collection.
Assert.Same(return2, return3);
// No new instances for string with the same content.
Assert.Equal(2, cache.Count);
}
public void RemoveLastInstanceDeallocatesEntry()
{
ProjectStringCache cache = new ProjectStringCache();
XmlDocument document = new XmlDocument();
string stringToAdd = "Test1";
string return1 = cache.Add(stringToAdd, document);
cache.Clear(document);
// Should be no instances left.
Assert.Equal(0, cache.Count);
// Build a new string guaranteed not to be optimized by the compiler into the same instance.
StringBuilder builder = new StringBuilder();
builder.Append("Test");
builder.Append('1');
XmlDocument document2 = new XmlDocument();
string return2 = cache.Add(builder.ToString(), document2);
// Returned references should NOT be the same
Assert.NotSame(return1, return2);
}
public void AddReturnsSameInstanceForDifferentDocument()
{
ProjectStringCache cache = new ProjectStringCache();
XmlDocument document = new XmlDocument();
string stringToAdd = "Test1";
string return1 = cache.Add(stringToAdd, document);
// Content of string should be the same.
Assert.Equal(stringToAdd, return1);
// Build a new string guaranteed not to be optimized by the compiler into the same instance.
StringBuilder builder = new StringBuilder();
builder.Append("Test");
builder.Append('1');
XmlDocument document2 = new XmlDocument();
string return2 = cache.Add(builder.ToString(), document2);
// Content of string should be the same.
Assert.Equal(builder.ToString(), return2);
// Returned references should be the same
Assert.Same(return1, return2);
// Should not have added any new string instances to the cache.
Assert.Equal(1, cache.Count);
}
public void RemoveOneInstance()
{
ProjectStringCache cache = new ProjectStringCache();
XmlDocument document = new XmlDocument();
string stringToAdd = "Test1";
string return1 = cache.Add(stringToAdd, document);
Assert.Equal(1, cache.Count);
XmlDocument document2 = new XmlDocument();
cache.Add(stringToAdd, document2);
Assert.Equal(1, cache.Count);
cache.Clear(document2);
// Since there is still one document referencing the string, it should remain.
Assert.Equal(1, cache.Count);
// Build a new string guaranteed not to be optimized by the compiler into the same instance.
StringBuilder builder = new StringBuilder();
builder.Append("Test");
builder.Append('1');
XmlDocument document3 = new XmlDocument();
string return3 = cache.Add(builder.ToString(), document3);
// Returned references should be the same
Assert.Same(return1, return3);
// Still should only be one cached instance.
Assert.Equal(1, cache.Count);
}
