public void GetNextNuid_PrefixIsConstant()
{
// Arrange
var nuid = new Nuid();
// Act
var firstNuid = nuid.GetNext().Substring(0, 12);
var secondNuid = nuid.GetNext().Substring(0, 12);
// Assert
Assert.Equal(firstNuid, secondNuid);
}
public void GetNextNuid_ReturnsDifferentNuidEachTime()
{
// Arrange
var nuid = new Nuid();
// Act
var firstNuid = nuid.GetNext();
var secondNuid = nuid.GetNext();
// Assert
Assert.NotEqual(firstNuid, secondNuid);
}
public void GetNextNuid_ReturnsNuidOfLength22()
{
// Arrange
var nuid = new Nuid();
//Act
var result = nuid.GetNext();
// Assert
Assert.Equal(22, result.Length);
}
public void GetNextNuid_PrefixAsExpected()
{
// Arrange
var rngBytes = new byte[12] {
0, 1, 2, 3, 4, 5, 6, 7, 11, 253, 254, 255
};
var rng = new ControlledRng(new Queue <byte[]>(new byte[][] { rngBytes, rngBytes }));
var nuid = new Nuid(rng);
// Act
var prefix = nuid.GetNext().Substring(0, 12);
// Assert
Assert.Equal("ABCDEFGHL9-_", prefix);
}
public void GetNextNuid_NuidsAreUnique()
{
// Arrange
const int count = 1_000_000;
var nuid = new Nuid();
var nuids = new HashSet <string>(StringComparer.Ordinal);
// Act
for (var i = 0; i < count; i++)
{
var currentNuid = nuid.GetNext();
//HashSet.Add returns false if the set already contains the item
if (nuids.Add(currentNuid))
{
continue;
}
_outputHelper.WriteLine($"Duplicate Nuid {currentNuid}");
Assert.True(false, "Duplicate Nuid detected");
}
}
