public void ReturnAllRemainingRowsWhenLimitIsTooBig()
{
var limitOffsetReader = new LimitOffsetDataReader(50, 2);
limitOffsetReader.SetInnerReader(CreateInnerReader());
CheckReaderData(limitOffsetReader, 3, 4, 5, 6, 7, 8, 9, 10);
}
public void ReturnNoRowsWhenOffsetIsTooBig()
{
var limitOffsetReader = new LimitOffsetDataReader(5, 20);
limitOffsetReader.SetInnerReader(CreateInnerReader());
CheckReaderData(limitOffsetReader, new int[] { });
}
public void SkipFirstRecordsAndLimitOthers()
{
var limitOffsetReader = new LimitOffsetDataReader(5, 2);
limitOffsetReader.SetInnerReader(CreateInnerReader());
CheckReaderData(limitOffsetReader, 3, 4, 5, 6, 7);
}
public void LimitRecords()
{
var limitOffsetReader = new LimitOffsetDataReader(4, 0);
limitOffsetReader.SetInnerReader(CreateInnerReader());
CheckReaderData(limitOffsetReader, 1, 2, 3, 4);
}
public void SkipFirstRecords()
{
var limitOffsetReader = new LimitOffsetDataReader(100, 5);
limitOffsetReader.SetInnerReader(CreateInnerReader());
CheckReaderData(limitOffsetReader, 6, 7, 8, 9, 10);
}
public void ThrowCorrectExceptionsWhenInstantiatedWithIncorrectArguments()
{
Action action;
action = () => new LimitOffsetDataReader(-1, 10);
action.Should().Throw <ArgumentException>()
.And.ParamName.Should().Be("limit", "Limit must be equal or greater than 0.");
action = () => new LimitOffsetDataReader(10, -1);
action.Should().Throw <ArgumentException>()
.And.ParamName.Should().Be("offset", "Offset must be equal or greater than 0.");
action = () => new LimitOffsetDataReader(1, 0);
action.Should().NotThrow();
var reader = new LimitOffsetDataReader(10, 10);
action = () => reader.SetInnerReader(null);
action.Should().Throw <ArgumentNullException>("Inner reader cannot be null.");
reader = new LimitOffsetDataReader(10, 10);
reader.SetInnerReader(CreateInnerReader());
action = () => reader.SetInnerReader(CreateInnerReader());
action.Should().Throw <InvalidOperationException>("Inner reader can be set only once.");
}
private bool CompareLimitOffsetDataReaders(LimitOffsetDataReader reader1, LimitOffsetDataReader reader2)
{
if (reader1 == null)
{
return(reader2 == null);
}
return((reader1.Limit == reader2.Limit) && (reader1.Offset == reader2.Offset));
}
public void CloseInnerReader()
{
var limitOffsetReader = new LimitOffsetDataReader(0, 2);
IDataReader innerReader = Substitute.For <IDataReader>();
limitOffsetReader.SetInnerReader(innerReader);
limitOffsetReader.Close();
innerReader.Received().Close();
}
public void ReturnFalseImmediatelyWhenOffsetIsTooBig()
{
var limitOffsetReader = new LimitOffsetDataReader(10, 20);
IDataReader innerReader = CreateInnerReader();
limitOffsetReader.SetInnerReader(innerReader);
limitOffsetReader.Read().Should().BeFalse();
innerReader.Received(11).Read();
innerReader.ClearReceivedCalls();
limitOffsetReader.Read().Should().BeFalse();
innerReader.Received(1).Read();
}
