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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.Linq;
using CsvHelper.Configuration;
using CsvHelper.Tests.Mocks;
using Xunit;
using System.IO;
using System.Globalization;
namespace CsvHelper.Tests.Reading
{
public class ConstantTests
{
[Fact]
public void ConstantAlwaysReturnsSameValueTest()
{
var parser = new ParserMock
{
{ "Id", "Name" },
{ "1", "one" },
{ "2", "two" },
};
var csv = new CsvReader(parser);
csv.Context.RegisterClassMap<TestStringMap>();
var records = csv.GetRecords<Test>().ToList();
Assert.Equal(1, records[0].Id);
Assert.Equal("constant", records[0].Name);
Assert.Equal(2, records[1].Id);
Assert.Equal("constant", records[1].Name);
}
[Fact]
public void ConstantIsNullTest()
{
var rows = new Queue<string[]>();
rows.Enqueue(new[] { "Id", "Name" });
rows.Enqueue(new[] { "1", "one" });
rows.Enqueue(new[] { "2", "two" });
rows.Enqueue(null);
var parser = new ParserMock
{
{ "Id", "Name" },
{ "1", "one" },
{ "2", "two" },
};
var csv = new CsvReader(parser);
csv.Context.RegisterClassMap<TestNullMap>();
var records = csv.GetRecords<Test>().ToList();
Assert.Equal(1, records[0].Id);
Assert.Null(records[0].Name);
Assert.Equal(2, records[1].Id);
Assert.Null(records[1].Name);
}
[Fact]
public void IntConstantTest()
{
var config = new CsvConfiguration(CultureInfo.InvariantCulture)
{
HasHeaderRecord = false,
};
using (var reader = new StringReader("1,one\r\n"))
using (var csv = new CsvReader(reader, config))
{
csv.Context.RegisterClassMap<TestIntMap>();
var records = csv.GetRecords<Test>().ToList();
Assert.Equal(-1, records[0].Id);
Assert.Equal("one", records[0].Name);
}
}
private class Test
{
public int Id { get; set; }
public string Name { get; set; }
}
private sealed class TestStringMap : ClassMap<Test>
{
public TestStringMap()
{
Map(m => m.Id);
Map(m => m.Name).Constant("constant");
}
}
private sealed class TestNullMap : ClassMap<Test>
{
public TestNullMap()
{
Map(m => m.Id);
Map(m => m.Name).Constant(null);
}
}
private sealed class TestIntMap : ClassMap<Test>
{
public TestIntMap()
{
Map(m => m.Id).Constant(-1);
Map(m => m.Name);
}
}
}
}
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