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using System.IO;
using System.Linq;
using System.Text;
using LibGit2Sharp.Tests.TestHelpers;
using Xunit;
namespace LibGit2Sharp.Tests
{
public class DiffBlobToBlobFixture : BaseFixture
{
[Fact]
public void ComparingABlobAgainstItselfReturnsNoDifference()
{
using (var repo = new Repository(StandardTestRepoPath))
{
var blob = repo.Lookup<Blob>("7909961");
ContentChanges changes = repo.Diff.Compare(blob, blob);
Assert.Equal(0, changes.LinesAdded);
Assert.Equal(0, changes.LinesDeleted);
Assert.Equal(string.Empty, changes.Patch);
}
}
[Fact]
public void CanCompareTwoVersionsOfABlobWithADiffOfTwoHunks()
{
using (var repo = new Repository(StandardTestRepoPath))
{
var oldblob = repo.Lookup<Blob>("7909961");
var newblob = repo.Lookup<Blob>("4e935b7");
ContentChanges changes = repo.Diff.Compare(oldblob, newblob);
Assert.False(changes.IsBinaryComparison);
Assert.Equal(3, changes.LinesAdded);
Assert.Equal(1, changes.LinesDeleted);
var expected = new StringBuilder()
.Append("@@ -1,4 +1,5 @@\n")
.Append(" 1\n")
.Append("+2\n")
.Append(" 3\n")
.Append(" 4\n")
.Append(" 5\n")
.Append("@@ -8,8 +9,9 @@\n")
.Append(" 8\n")
.Append(" 9\n")
.Append(" 10\n")
.Append("-12\n")
.Append("+11\n")
.Append(" 12\n")
.Append(" 13\n")
.Append(" 14\n")
.Append(" 15\n")
.Append("+16\n");
Assert.Equal(expected.ToString(), changes.Patch);
}
}
Blob CreateBinaryBlob(Repository repo)
{
string fullpath = Path.Combine(repo.Info.WorkingDirectory, "binary.bin");
File.WriteAllBytes(fullpath, new byte[] { 17, 16, 0, 4, 65 });
return repo.ObjectDatabase.CreateBlob(fullpath);
}
[Fact]
public void CanCompareATextualBlobAgainstABinaryBlob()
{
string path = CloneStandardTestRepo();
using (var repo = new Repository(path))
{
Blob binBlob = CreateBinaryBlob(repo);
var blob = repo.Lookup<Blob>("7909961");
ContentChanges changes = repo.Diff.Compare(blob, binBlob);
Assert.True(changes.IsBinaryComparison);
Assert.Equal(0, changes.LinesAdded);
Assert.Equal(0, changes.LinesDeleted);
}
}
[Fact]
public void CanCompareABlobAgainstANullBlob()
{
using (var repo = new Repository(StandardTestRepoPath))
{
var blob = repo.Lookup<Blob>("7909961");
ContentChanges changes = repo.Diff.Compare(null, blob);
Assert.NotEqual(0, changes.LinesAdded);
Assert.Equal(0, changes.LinesDeleted);
Assert.NotEqual(string.Empty, changes.Patch);
changes = repo.Diff.Compare(blob, null);
Assert.Equal(0, changes.LinesAdded);
Assert.NotEqual(0, changes.LinesDeleted);
Assert.NotEqual(string.Empty, changes.Patch);
}
}
[Fact]
public void ComparingTwoNullBlobsReturnsAnEmptyContentChanges()
{
using (var repo = new Repository(StandardTestRepoPath))
{
ContentChanges changes = repo.Diff.Compare((Blob)null, (Blob)null);
Assert.False(changes.IsBinaryComparison);
Assert.Equal(0, changes.LinesAdded);
Assert.Equal(0, changes.LinesDeleted);
}
}
}
}
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