private static IEnumerable <Dictionary <string, object> > GetIterator(HydraRingDatabaseReader reader)
{
Dictionary <string, object> nextLine = reader.ReadLine();
while (nextLine != null)
{
yield return(nextLine);
nextLine = reader.ReadLine();
}
}
/// <summary>
/// Tries to read a result from the reader and throws an exception if no row could be read.
/// </summary>
/// <param name="exceptionMessage">The message to use in the exception when reading fails.</param>
/// <param name="reader">The reader to read a row from.</param>
/// <returns>A single row from the reader.</returns>
/// <exception cref="HydraRingFileParserException">Thrown when no row could be read from the
/// <paramref name="reader"/>.</exception>
private static Dictionary <string, object> ReadLineFromReader(string exceptionMessage, HydraRingDatabaseReader reader)
{
Dictionary <string, object> result = reader.ReadLine();
if (result != null)
{
return(result);
}
throw new HydraRingFileParserException(exceptionMessage);
}
public void ReadLine_EmptyDatabase_ReturnsNull()
{
// Setup
string directory = Path.Combine(testDirectory, emptyDatabase);
using (var reader = new HydraRingDatabaseReader(directory, query, 1))
{
// Call
Dictionary <string, object> result = reader.ReadLine();
// Assert
Assert.IsNull(result);
}
}