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// Copyright 2009-2022 Josh Close
// This file is a part of CsvHelper and is dual licensed under MS-PL and Apache 2.0.
// See LICENSE.txt for details or visit http://www.opensource.org/licenses/ms-pl.html for MS-PL and http://opensource.org/licenses/Apache-2.0 for Apache 2.0.
// https://github.com/JoshClose/CsvHelper
using System.Globalization;
using System.IO;
using System.Linq;
using CsvHelper.Configuration;
using Xunit;
namespace CsvHelper.Tests.Reading
{
public class DetectColumnCountChangesTests
{
[Fact]
public void ConsistentColumnsWithDetectColumnChangesTest()
{
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
DetectColumnCountChanges = true,
};
using (var stream = new MemoryStream())
using (var writer = new StreamWriter(stream))
using (var reader = new StreamReader(stream))
using (var csv = new CsvReader(reader, config))
{
writer.WriteLine("Column 1,Column 2");
writer.WriteLine("1,2");
writer.Flush();
stream.Position = 0;
while (!csv.Read())
{
}
}
}
[Fact]
public void InconsistentColumnsMultipleRowsTest()
{
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
DetectColumnCountChanges = true,
};
using (var stream = new MemoryStream())
using (var writer = new StreamWriter(stream))
using (var reader = new StreamReader(stream))
using (var csv = new CsvReader(reader, config))
{
writer.WriteLine("Column 1,Column 2");
writer.WriteLine("1,2"); // Valid
writer.WriteLine("1,2,3"); // Error - too many fields
writer.WriteLine("1,2"); // Valid
writer.WriteLine("1"); // Error - not enough fields
writer.WriteLine("1,2,3,4"); // Error - too many fields
writer.WriteLine("1,2"); // Valid
writer.WriteLine("1,2"); // Valid
writer.Flush();
stream.Position = 0;
var failCount = 0;
while (true)
{
try
{
if (!csv.Read())
{
break;
}
}
catch (BadDataException)
{
failCount++;
}
}
// Expect only 3 errors
Assert.Equal<int>(3, failCount);
}
}
[Fact]
public void InconsistentColumnsSmallerTest()
{
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
DetectColumnCountChanges = true,
};
using (var stream = new MemoryStream())
using (var writer = new StreamWriter(stream))
using (var reader = new StreamReader(stream))
using (var csv = new CsvReader(reader, config))
{
writer.WriteLine("1,2,3,4");
writer.WriteLine("5,6,7");
writer.Flush();
stream.Position = 0;
csv.Read();
try
{
csv.Read();
throw new XUnitException();
}
catch (BadDataException)
{
}
}
}
[Fact]
public void InconsistentColumnsTest()
{
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
DetectColumnCountChanges = true,
};
using (var stream = new MemoryStream())
using (var writer = new StreamWriter(stream))
using (var reader = new StreamReader(stream))
using (var csv = new CsvReader(reader, config))
{
writer.WriteLine("Column 1,Column 2");
writer.WriteLine("1,2,3");
writer.Flush();
stream.Position = 0;
csv.Read();
try
{
csv.Read();
throw new XUnitException();
}
catch (BadDataException)
{
}
}
}
[Fact]
public void WillThrowOnMissingFieldStillWorksTest()
{
var missingFieldExceptionCount = 0;
var columnCountChangeExceptionCount = 0;
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
DetectColumnCountChanges = true,
HeaderValidated = null,
ReadingExceptionOccurred = (args) =>
{
if (args.Exception is MissingFieldException)
{
missingFieldExceptionCount++;
}
else if (args.Exception is BadDataException)
{
columnCountChangeExceptionCount++;
}
return false;
},
};
using (var stream = new MemoryStream())
using (var writer = new StreamWriter(stream))
using (var reader = new StreamReader(stream))
using (var csv = new CsvReader(reader, config))
{
writer.WriteLine("1,2,3");
writer.WriteLine("4,5");
writer.Flush();
stream.Position = 0;
csv.Context.RegisterClassMap<TestMap>();
var records = csv.GetRecords<Test>().ToList();
Assert.Equal(1, missingFieldExceptionCount);
Assert.Equal(1, columnCountChangeExceptionCount);
}
}
private class Test
{
public int Id { get; set; }
public string Name { get; set; }
}
private sealed class TestMap : ClassMap<Test>
{
public TestMap()
{
Map(m => m.Id);
Map(m => m.Name);
}
}
}
}
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