public void Test()
{
var settings = new LineGeneratorSettings(1, 5, 10, 128, ". ");
const int expectedStringLength = 10;
const int expectedNumberPartLength = 1;
var expectedNextBytes = Enumerable.Range(1, expectedStringLength).Select(x => (byte)x).ToArray();
var expectedNumberPart = "2";
var expectedStringPart = "456789a";
var expectedString = $"{expectedNumberPart}{Encoding.ASCII.GetString(settings.PartsSeparatorBytes)}{expectedStringPart}";
var randomGenerator = Substitute.For <IRandomGenerator>();
randomGenerator
.Next(settings.MinLineLength, settings.MaxLineLength + 1)
.Returns(expectedStringLength);
randomGenerator
.Next(settings.MinNumberLength, settings.MaxNumberLength + 1)
.Returns(expectedNumberPartLength);
randomGenerator
.When(x => x.NextBytes(Arg.Any <byte[]>(), Arg.Any <int>(), Arg.Any <int>()))
.Do(callInfo => expectedNextBytes.CopyTo(callInfo.ArgAt <byte[]>(0), 0));
var stream = Substitute.For <Stream>();
var lineWriter = new LineGenerator(
randomGenerator,
settings,
new NumberPartGenerator(),
new StringPartGenerator());
var lineInfo = lineWriter.GetNewLine();
Assert.That(
Encoding.ASCII.GetString(lineInfo.Line),
Is.EqualTo(expectedString));
Assert.That(
Encoding.ASCII.GetString(lineInfo.NumberPart),
Is.EqualTo(expectedNumberPart));
Assert.That(
Encoding.ASCII.GetString(lineInfo.StringPart),
Is.EqualTo(expectedStringPart));
}