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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.Collections.Generic;
using System.Globalization;
using CsvHelper.Configuration;
using CsvHelper.Tests.Mocks;
using Xunit;
namespace CsvHelper.Tests.Reading
{
public class ReadHeaderTests
{
[Fact]
public void ReadHeaderReadsHeaderTest()
{
var parser = new ParserMock
{
{ "Id", "Name" },
{ "1", "One" },
{ "2", "two" },
null
};
var csv = new CsvReader(parser);
csv.Read();
csv.ReadHeader();
Assert.NotNull(csv.HeaderRecord);
Assert.Equal("Id", csv.HeaderRecord[0]);
Assert.Equal("Name", csv.HeaderRecord[1]);
}
[Fact]
public void ReadHeaderDoesNotAffectCurrentRecordTest()
{
var parser = new ParserMock
{
{ "Id", "Name" },
{ "1", "One" },
{ "2", "two" },
null,
};
var csv = new CsvReader(parser);
csv.Read();
csv.ReadHeader();
Assert.Equal("Id", csv.Parser[0]);
Assert.Equal("Name", csv.Parser[1]);
}
[Fact]
public void ReadingHeaderFailsWhenReaderIsDoneTest()
{
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
HasHeaderRecord = false,
};
var parser = new ParserMock(config)
{
{ "Id", "Name" },
{ "1", "One" },
{ "2", "two" },
null,
};
var csv = new CsvReader(parser);
while (csv.Read()) { }
Assert.Throws<ReaderException>(() => csv.ReadHeader());
}
[Fact]
public void ReadingHeaderFailsWhenNoHeaderRecordTest()
{
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
HasHeaderRecord = false,
};
var parser = new ParserMock(config)
{
{ "Id", "Name" },
{ "1", "One" },
{ "2", "two" },
null
};
var csv = new CsvReader(parser);
Assert.Throws<ReaderException>(() => csv.ReadHeader());
}
[Fact]
public void ReadingHeaderDoesNotFailWhenHeaderAlreadyReadTest()
{
var parser = new ParserMock
{
{ "Id", "Name" },
{ "1", "One" },
{ "2", "two" },
null
};
var csv = new CsvReader(parser);
csv.Read();
csv.ReadHeader();
csv.ReadHeader();
}
[Fact]
public void ReadHeaderResetsNamedIndexesTest()
{
var parser = new ParserMock
{
{ "Id", "Name" },
{ "Name", "Id" },
};
var csv = new CsvReader(parser);
csv.Read();
csv.ReadHeader();
Assert.Equal(0, csv.GetFieldIndex("Id"));
Assert.Equal(1, csv.GetFieldIndex("Name"));
csv.Read();
csv.ReadHeader();
Assert.Equal(1, csv.GetFieldIndex("Id"));
Assert.Equal(0, csv.GetFieldIndex("Name"));
}
[Fact]
public void MultipleReadHeaderCallsWorksWithNamedIndexCacheTest()
{
var parser = new ParserMock
{
{ "Id", "Name", "Id", "Name" },
{ "1", "one", "2", "two" },
{ "Name", "Id", "Name", "Id" },
{ "three", "3", "four", "4" },
};
var csv = new CsvReader(parser);
csv.Read();
csv.ReadHeader();
csv.Read();
Assert.Equal(1, csv.GetField<int>("Id"));
Assert.Equal("one", csv.GetField("Name"));
Assert.Equal(2, csv.GetField<int>("Id", 1));
Assert.Equal("two", csv.GetField("Name", 1));
csv.Read();
csv.ReadHeader();
csv.Read();
Assert.Equal(3, csv.GetField<int>("Id"));
Assert.Equal("three", csv.GetField("Name"));
Assert.Equal(4, csv.GetField<int>("Id", 1));
Assert.Equal("four", csv.GetField("Name", 1));
}
}
}
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