added tests for GenerateGitVersionInformation task

Author: arturcic

src/GitVersionTask.MsBuild/Tasks/GenerateGitVersionInformation.cs

@@ -11,7 +11,7 @@ public class GenerateGitVersionInformation : GitVersionTaskBase
         public string IntermediateOutputPath { get; set; }
 
         [Required]
-        public string Language { get; set; }
+        public string Language { get; set; } = "C#";
 
         [Output]
         public string GitVersionInformationFilePath { get; set; }

src/GitVersionTask.Tests/GenerateGitVersionInformationTest.cs

@@ -0,0 +1,79 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using GitTools.Testing;
+using GitVersion.BuildServers;
+using GitVersion.MSBuildTask.Tasks;
+using GitVersionCore.Tests.Helpers;
+using GitVersionTask.Tests.Helpers;
+using LibGit2Sharp;
+using NUnit.Framework;
+using Shouldly;
+
+namespace GitVersion.MSBuildTask.Tests
+{
+    [TestFixture]
+    public class GenerateGitVersionInformationTest : TestBase
+    {
+        [Test]
+        public void GenerateGitVersionInformationTaskShouldCreateFile()
+        {
+            using var fixture = new EmptyRepositoryFixture();
+            fixture.MakeATaggedCommit("1.2.3");
+            fixture.MakeACommit();
+
+            var task = new GenerateGitVersionInformation
+            {
+                SolutionDirectory = fixture.RepositoryPath,
+                ProjectFile = fixture.RepositoryPath,
+            };
+
+            var msbuildFixture = new MsBuildFixture();
+            var result = msbuildFixture.Execute(task);
+
+            result.Success.ShouldBe(true);
+            result.Errors.ShouldBe(0);
+            result.Task.GitVersionInformationFilePath.ShouldNotBeNull();
+
+            var fileContent = File.ReadAllText(result.Task.GitVersionInformationFilePath);
+            fileContent.ShouldContain(@"FullSemVer = ""1.2.4+1""");
+        }
+
+        [Test]
+        public void GenerateGitVersionInformationTaskShouldCreateFileWhenRunningInBuildServer()
+        {
+            using var fixture = new RemoteRepositoryFixture();
+            fixture.Repository.MakeACommit();
+            fixture.Repository.MakeATaggedCommit("1.0.0");
+            fixture.Repository.MakeACommit();
+            fixture.Repository.CreateBranch("develop");
+
+            Commands.Fetch((Repository)fixture.LocalRepositoryFixture.Repository, fixture.LocalRepositoryFixture.Repository.Network.Remotes.First().Name, new string[0], new FetchOptions(), null);
+            Commands.Checkout(fixture.LocalRepositoryFixture.Repository, fixture.Repository.Head.Tip);
+            fixture.LocalRepositoryFixture.Repository.Branches.Remove("master");
+            fixture.InitializeRepo();
+
+            var task = new GenerateGitVersionInformation
+            {
+                SolutionDirectory = fixture.LocalRepositoryFixture.RepositoryPath,
+                ProjectFile = fixture.LocalRepositoryFixture.RepositoryPath,
+            };
+
+            var env = new Dictionary<string, string>
+            {
+                { AzurePipelines.EnvironmentVariableName, "true" }
+            };
+
+            var msbuildFixture = new MsBuildFixture();
+            msbuildFixture.WithEnv(env.ToArray());
+            var result = msbuildFixture.Execute(task);
+
+            result.Success.ShouldBe(true);
+            result.Errors.ShouldBe(0);
+            result.Task.GitVersionInformationFilePath.ShouldNotBeNull();
+
+            var fileContent = File.ReadAllText(result.Task.GitVersionInformationFilePath);
+            fileContent.ShouldContain(@"FullSemVer = ""1.0.1+1""");
+        }
+    }
+}