Cover commit counting mechanism with tests

Fix #79

Author: nulltoken

Tests/GitFlow/VersionByCommitFixture.cs

@@ -0,0 +1,209 @@
+using GitVersion;
+using LibGit2Sharp;
+using NUnit.Framework;
+
+[TestFixture]
+public class VersionByCommitFixture : Lg2sHelperBase
+{
+    /*
+     *  hotfix-1.2.1       -----------C--      
+     *                    /              \     
+     *  master           A----------------F-----H-------N
+     *                    \                    / \     /
+     *  hotfix-1.3.1       \                  /   ----L
+     *                      \                /         \
+     *  release-1.3.0        \        -D----G---        \
+     *                        \      /          \        \
+     *  develop                -----B----E-------I-----M--O--P
+     *                                    \           /
+     *  feature                            -------J-K-
+     * 
+     *
+     *  - A is tagged `1.2.0`
+     *  - F is tagged `1.2.1`
+     *  - H is tagged `1.3.0`
+     *  - N is tagged `1.3.1`
+    */
+
+    [Test]
+    public void CanCorrectlyDetectCommitCountsWhenThatApplies()
+    {
+        var repoPath = Clone(CCTestRepoWorkingDirPath);
+
+        using (var repo = new Repository(repoPath))
+        {
+            ResetToP(repo);
+            Assert.AreEqual(7, CommitCountFor(repo, "develop"));
+
+            ResetToO(repo);
+            Assert.AreEqual(6, CommitCountFor(repo, "develop"));
+
+            ResetToN(repo);
+            Assert.IsNull(CommitCountFor(repo, "master"));
+
+            ResetToM(repo);
+            Assert.AreEqual(5, CommitCountFor(repo, "develop"));
+
+            ResetToL(repo);
+            Assert.AreEqual(1, CommitCountFor(repo, "hotfix-1.3.1"));
+
+            ResetToK(repo);
+            Assert.AreEqual(2, CommitCountFor(repo, "feature"));
+
+            ResetToJ(repo);
+            Assert.AreEqual(1, CommitCountFor(repo, "feature"));
+
+            ResetToI(repo);
+            Assert.AreEqual(2, CommitCountFor(repo, "develop"));
+
+            ResetToH(repo);
+            Assert.IsNull(CommitCountFor(repo, "master"));
+
+            ResetToG(repo);
+            Assert.AreEqual(2, CommitCountFor(repo, "release-1.3.0"));
+
+            ResetToF(repo);
+            Assert.IsNull(CommitCountFor(repo, "master"));
+
+            ResetToE(repo);
+            Assert.AreEqual(2, CommitCountFor(repo, "develop"));
+
+            ResetToD(repo);
+            Assert.AreEqual(1, CommitCountFor(repo, "release-1.3.0"));
+
+            ResetToC(repo);
+            Assert.AreEqual(1, CommitCountFor(repo, "hotfix-1.2.1"));
+
+            ResetToB(repo);
+            Assert.AreEqual(1, CommitCountFor(repo, "develop"));
+        }
+    }
+
+    static int? CommitCountFor(Repository repo, string branchName)
+    {
+        var gvf = new GitVersionFinder();
+        var context = new GitVersionContext
+                                {
+                                    CurrentBranch = repo.Branches[branchName],
+                                    Repository = repo
+                                };
+
+        var sv = gvf.FindVersion(context);
+
+        var number = sv.BuildMetaData.CommitsSinceTag;
+
+        return number;
+    }
+
+    void DropTags(Repository repo, params string[] names)
+    {
+        foreach (var name in names)
+        {
+            if (repo.Tags[name] == null)
+            {
+                continue;
+            }
+
+            repo.Tags.Remove(name);
+        }
+    }
+
+    void DropBranches(Repository repo, params string[] names)
+    {
+        foreach (var name in names)
+        {
+            if (repo.Branches[name] == null)
+            {
+                continue;
+            }
+
+            repo.Branches.Remove(name);
+        }
+    }
+
+    void ResetBranch(Repository repo, string name, string committish)
+    {
+        var b = repo.Branches[name];
+        Assert.IsNotNull(b);
+        repo.Refs.UpdateTarget(b.CanonicalName, committish);
+    }
+
+    void ResetToP(Repository repo)
+    {
+        ResetBranch(repo, "develop", "4d65c519f88773854f9345eaf5dbb30cb49f6a74");
+    }
+
+    void ResetToO(Repository repo)
+    {
+        ResetBranch(repo, "develop", "7655537837096d925a4f974232f78ec589d86ebd");
+    }
+
+    void ResetToN(Repository repo)
+    {
+        ResetBranch(repo, "develop", "0b7a2482ab7d167cefa4ecfc106db001dc5c17ff");
+    }
+
+    void ResetToM(Repository repo)
+    {
+        ResetBranch(repo, "develop", "0b7a2482ab7d167cefa4ecfc106db001dc5c17ff");
+        ResetBranch(repo, "master", "5b84136c848fd48f1f8b3fa4e1b767a1f6101279");
+        DropTags(repo, "1.3.1");
+    }
+
+    void ResetToL(Repository repo)
+    {
+        ResetBranch(repo, "develop", "243f56dcdb543688fd0a99bd3e0e72dd9a786603");
+    }
+
+    void ResetToK(Repository repo)
+    {
+        DropBranches(repo, "hotfix-1.3.1");
+    }
+
+    void ResetToJ(Repository repo)
+    {
+        ResetBranch(repo, "feature", "0491c5dac30d706f4e54c5cb26d082baad8228d1");
+    }
+
+    void ResetToI(Repository repo)
+    {
+        DropBranches(repo, "feature");
+    }
+
+    void ResetToH(Repository repo)
+    {
+        ResetBranch(repo, "develop", "320f4b6820cf4b0853dc08ac153f04fbd4958200");
+    }
+
+    void ResetToG(Repository repo)
+    {
+        ResetBranch(repo, "master", "576a28e321cd6dc764b52c5fface672fa076f37f");
+        DropTags(repo, "1.3.0");
+    }
+
+    void ResetToF(Repository repo)
+    {
+        ResetBranch(repo, "release-1.3.0", "b53054c614d36edc9d1bee8c35cd2ed575a43607");
+    }
+
+    void ResetToE(Repository repo)
+    {
+        ResetBranch(repo, "master", "8c890487ed143d5a72d151e64be1c5ddb314c908");
+        DropTags(repo, "1.2.1");
+    }
+
+    void ResetToD(Repository repo)
+    {
+        ResetBranch(repo, "develop", "fab69e28ee35dd912c0c95d5993dd84e4f2bcd92");
+    }
+
+    void ResetToC(Repository repo)
+    {
+        DropBranches(repo, "release-1.3.0");
+    }
+
+    void ResetToB(Repository repo)
+    {
+        DropBranches(repo, "hotfix-1.2.1");
+    }
+}

Tests/Helpers/Lg2sHelperBase.cs

@@ -36,8 +36,9 @@ static Lg2sHelperBase()
         }
     }
 
-    public static string ASBMTestRepoWorkingDirPath;
-    public static DirectoryInfo ResourcesDirectory;
+    protected static string ASBMTestRepoWorkingDirPath { private set; get; }
+    protected static string CCTestRepoWorkingDirPath { private set; get; }
+    static DirectoryInfo ResourcesDirectory;
 
     static void SetUpTestEnvironment()
     {
@@ -54,6 +55,7 @@ static void SetUpTestEnvironment()
 
         // Setup standard paths to our test repositories
         ASBMTestRepoWorkingDirPath = Path.Combine(ResourcesDirectory.FullName, "asbm_wd");
+        CCTestRepoWorkingDirPath = Path.Combine(ResourcesDirectory.FullName, "commit_counting_wd");
     }
 
     protected SelfCleaningDirectory BuildSelfCleaningDirectory()

Tests/Tests.csproj

@@ -103,6 +103,7 @@
     <Compile Include="BranchFinders\DevelopTests.cs" />
     <Compile Include="BuildServers\TeamCityTests.cs" />
     <Compile Include="BuildServers\ContinuaCiTests.cs" />
+    <Compile Include="GitFlow\VersionByCommitFixture.cs" />
     <Compile Include="GitFlow\GitFlowVersionFinderTests.cs" />
     <Compile Include="GitHelperTests.cs" />
     <Compile Include="GitVersionTask.cs" />