Add tests for commit on current branch

Author: gitfool

src/GitVersionCore.Tests/Core/GitVersionExecutorTests.cs

@@ -394,6 +394,21 @@ public void WorkingDirectoryWithoutGit()
             exception.Message.ShouldContain("Can't find the .git directory in");
         }
 
+        [Test]
+        public void WorkingDirectoryWithoutCommits()
+        {
+            using var fixture = new EmptyRepositoryFixture();
+
+            var gitVersionOptions = new GitVersionOptions { WorkingDirectory = fixture.RepositoryPath };
+
+            var exception = Assert.Throws<GitVersionException>(() =>
+            {
+                var gitVersionCalculator = GetGitVersionCalculator(gitVersionOptions);
+                gitVersionCalculator.CalculateVersionVariables();
+            });
+            exception.Message.ShouldContain("No commits found on the current branch.");
+        }
+
         [Test]
         [Category("NoMono")]
         [Description("LibGit2Sharp fails when running under Mono")]

src/GitVersionExe.Tests/ExecCmdLineArgumentTest.cs

@@ -80,6 +80,17 @@ public void WorkingDirectoryWithoutGitFolderFailsWithInformativeMessage()
             result.Output.ShouldContain("Can't find the .git directory in");
         }
 
+        [Test]
+        public void WorkingDirectoryWithoutCommitsFailsWithInformativeMessage()
+        {
+            using var fixture = new EmptyRepositoryFixture();
+
+            var result = GitVersionHelper.ExecuteIn(fixture.RepositoryPath, arguments: null, logToFile: false);
+
+            result.ExitCode.ShouldNotBe(0);
+            result.Output.ShouldContain("No commits found on the current branch.");
+        }
+
         [Test]
         public void WorkingDirectoryDoesNotExistFailsWithInformativeMessage()
         {