Merge branch 'submodules' of https://github.com/asherber/nerdbank.gitversioning

Author: AArnott

src/NerdBank.GitVersioning.Tests/NerdBank.GitVersioning.Tests.csproj

@@ -50,6 +50,7 @@
     <Compile Include="GitExtensionsTests.cs" />
     <Compile Include="MSBuildExtensions.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="RepoFinderTests.cs" />
     <Compile Include="RepoTestBase.cs" />
     <Compile Include="SemanticVersionTests.cs" />
     <Compile Include="TestUtilities.cs" />

src/NerdBank.GitVersioning.Tests/RepoFinderTests.cs

@@ -0,0 +1,75 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace Nerdbank.GitVersioning.Tests
+{
+    public class RepoFinderTests : RepoTestBase
+    {
+        private MethodInfo _findGitDirMi;
+        private string _gitDir;
+
+        public RepoFinderTests(ITestOutputHelper logger) : base(logger)
+        {
+            this.InitializeSourceControl();
+            _findGitDirMi = typeof(VersionOracle).GetMethod("FindGitDir", BindingFlags.Static | BindingFlags.NonPublic);
+            _gitDir = Path.Combine(this.RepoPath, ".git");
+        }
+
+        private string FindGitDir(string startingDir)
+        {
+            var result = _findGitDirMi.Invoke(null, new[] { startingDir });
+            return (string)result;
+        }
+
+        private DirectoryInfo CreateSubDirectory()
+        {
+            return Directory.CreateDirectory(Path.Combine(this.RepoPath, Guid.NewGuid().ToString()));
+        }
+
+        [Fact]
+        public void RepoRoot()
+        {
+            Assert.Equal(FindGitDir(this.RepoPath), _gitDir);
+        }
+
+        [Fact]
+        public void SubDirectory()
+        {
+            var dir = CreateSubDirectory();
+            Assert.Equal(FindGitDir(dir.FullName), _gitDir);
+        }
+
+        [Theory]
+        [InlineData("")]
+        [InlineData("askdjn")]
+        [InlineData("gitdir: ../qwerty")]
+        public void SubDirectoryWithInvalidGitFile(string contents)
+        {
+            var dir = CreateSubDirectory();
+            File.WriteAllText(Path.Combine(dir.FullName, ".git"), contents);
+            Assert.Equal(FindGitDir(dir.FullName), _gitDir);
+        }
+
+        [Fact]
+        public void SubDirectoryWithValidGitFile()
+        {
+            var submodule = CreateSubDirectory();
+            var gitDir = CreateSubDirectory();
+            File.WriteAllText(Path.Combine(submodule.FullName, ".git"), $"gitdir: ../{gitDir.Name}");
+            Assert.Equal(FindGitDir(submodule.FullName), gitDir.FullName);
+        }
+
+        [Fact]
+        public void NonRepoDirectory()
+        {
+            Assert.Equal(FindGitDir(Path.GetTempPath()), null);
+        }
+    }
+}