Create a test for PatchWhitespaceMode.

Author: Divad-H

LibGit2Sharp.Tests/DiffTreeToTreeFixture.cs

@@ -4,7 +4,6 @@
 usingSystem.Text;
 usingLibGit2Sharp.Tests.TestHelpers;
 usingXunit;
-usingXunit.Extensions;
 
 namespaceLibGit2Sharp.Tests
 {
@@ -1219,5 +1218,71 @@ public void UsingPatienceAlgorithmCompareOptionProducesPatienceDiff()
 Assert.Equal(diffPatience,changes);
 }
 }
+
+[Fact]
+publicvoidPatchWhitespaceModeIsObeyed()
+{
+stringrepoPath=InitNewRepository();
+
+varcompareOptions=Enum
+.GetValues(typeof(PatchWhitespaceMode))
+.Cast<PatchWhitespaceMode>()
+.Select(whitespaceOption =>newCompareOptions(){PatchWhitespaceMode=whitespaceOption});
+
+using(varrepo=newRepository(repoPath))
+{
+conststringfileName="file.txt";
+varcommits=newSystem.Collections.Generic.List<Commit>();
+
+Touch(repo.Info.WorkingDirectory,fileName,"White space is not wastedspace.");
+Commands.Stage(repo,fileName);
+commits.Add(repo.Commit("Initial",Constants.Signature,Constants.Signature));
+
+Touch(repo.Info.WorkingDirectory,fileName,"White space is not wastedspace. \t");
+Commands.Stage(repo,fileName);
+commits.Add(repo.Commit("Add trailing whitespace.",Constants.Signature,Constants.Signature));
+
+Touch(repo.Info.WorkingDirectory,fileName,"White space\tis not wastedspace. ");
+Commands.Stage(repo,fileName);
+commits.Add(repo.Commit("Change whitespace.",Constants.Signature,Constants.Signature));
+
+Touch(repo.Info.WorkingDirectory,fileName," Whitespace is not wasted space.");
+Commands.Stage(repo,fileName);
+commits.Add(repo.Commit("Insert whitespace.",Constants.Signature,Constants.Signature));
+
+Touch(repo.Info.WorkingDirectory,fileName,"Completely different content.");
+Commands.Stage(repo,fileName);
+commits.Add(repo.Commit("Completely different.",Constants.Signature,Constants.Signature));
+
+varcommitPairs=commits
+.Select((oldCommit,index)=>new{oldCommit,index})
+.Zip(commits.Skip(1),(old,newCommit)=>new{old.oldCommit,newCommit,old.index});
+
+foreach(varcommitPairincommitPairs)
+foreach(varcompareOptionincompareOptions)
+using(varpatch=repo.Diff.Compare<Patch>(commitPair.oldCommit.Tree,commitPair.newCommit.Tree,compareOption))
+{
+intexpectedDiffLines;
+switch(compareOption.PatchWhitespaceMode)
+{
+casePatchWhitespaceMode.DontIgnoreWhitespace:
+expectedDiffLines=1;
+break;
+casePatchWhitespaceMode.IgnoreAllWhitespace:
+expectedDiffLines=commitPair.index>2?1:0;
+break;
+casePatchWhitespaceMode.IgnoreWhitespaceChange:
+expectedDiffLines=commitPair.index>1?1:0;
+break;
+casePatchWhitespaceMode.IgnoreWhitespaceEol:
+expectedDiffLines=commitPair.index>0?1:0;
+break;
+default:
+thrownewException("Unexpected "+nameof(PatchWhitespaceMode));
+}
+Assert.Equal(expectedDiffLines,patch.LinesAdded);
+}
+}
+}
 }
 }