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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 System.IO;
using System.Text;
using CsvHelper.Configuration;
using Xunit;
namespace CsvHelper.Tests.Writing
{
public class ConstantTests
{
[Fact]
public void StringConstantTest()
{
using (var stream = new MemoryStream())
using (var reader = new StreamReader(stream))
using (var writer = new StreamWriter(stream))
using (var csv = new CsvWriter(writer, CultureInfo.InvariantCulture))
{
var records = new List<Test>
{
new Test { Id = 1, Name = "one" },
new Test { Id = 2, Name = "two" }
};
csv.Context.RegisterClassMap<TestStringMap>();
csv.WriteRecords(records);
writer.Flush();
stream.Position = 0;
var expected = new TestStringBuilder(csv.Configuration.NewLine);
expected.AppendLine("Id,Name");
expected.AppendLine("1,constant");
expected.AppendLine("2,constant");
var result = reader.ReadToEnd();
Assert.Equal(expected.ToString(), result);
}
}
[Fact]
public void NullConstantTest()
{
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
HasHeaderRecord = false,
};
using (var writer = new StringWriter())
using (var csv = new CsvWriter(writer, config))
{
var records = new List<Test>
{
new Test { Id = 1, Name = "one" },
};
csv.Context.RegisterClassMap<TestNullMap>();
csv.WriteRecords(records);
writer.Flush();
Assert.Equal("1,\r\n", writer.ToString());
}
}
[Fact]
public void IntConstantTest()
{
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
HasHeaderRecord = false,
};
using (var writer = new StringWriter())
using (var csv = new CsvWriter(writer, config))
{
var records = new List<Test>
{
new Test { Id = 1, Name = "one" },
};
csv.Context.RegisterClassMap<TestIntMap>();
csv.WriteRecords(records);
writer.Flush();
Assert.Equal("-1,one\r\n", writer.ToString());
}
}
private class Test
{
public int Id { get; set; }
public string Name { get; set; }
}
private sealed class TestIntMap : ClassMap<Test>
{
public TestIntMap()
{
Map(m => m.Id).Constant(-1);
Map(m => m.Name);
}
}
private sealed class TestNullMap : ClassMap<Test>
{
public TestNullMap()
{
Map(m => m.Id);
Map(m => m.Name).Constant(null);
}
}
private sealed class TestStringMap : ClassMap<Test>
{
public TestStringMap()
{
Map(m => m.Id);
Map(m => m.Name).Constant("constant");
}
}
}
}
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