From edc900e690cb33d9066904009d4a823b77a10936 Mon Sep 17 00:00:00 2001
From: Dawid Kaliszewski <dkaliszewski@eshopworld.com>
Date: Fri, 11 Aug 2023 16:14:41 +0200
Subject: [PATCH] Test implemented

---
 .../MainlineDevelopmentMode.cs                | 93 +++++++++++++++++++
 src/GitVersion.Testing/GitTestExtensions.cs   |  3 +-
 2 files changed, 95 insertions(+), 1 deletion(-)

diff --git a/src/GitVersion.Core.Tests/IntegrationTests/MainlineDevelopmentMode.cs b/src/GitVersion.Core.Tests/IntegrationTests/MainlineDevelopmentMode.cs
index 7910912faf..87e1c0ebe3 100644
--- a/src/GitVersion.Core.Tests/IntegrationTests/MainlineDevelopmentMode.cs
+++ b/src/GitVersion.Core.Tests/IntegrationTests/MainlineDevelopmentMode.cs
@@ -585,4 +585,97 @@ public void NoBumpMessageTakesPrecedenceOverBumpMessage(string commitMessage)
 
         fixture.AssertFullSemver("1.0.0", conventionalCommitsConfig);
     }
+
+    [Test]
+    public void VerifyIssue3644BumpsMajorBasedOnLastTagNotTheFullHistory()
+    {
+        /*
+mode: Mainline
+assembly-versioning-format: '{Major}.{Minor}.{Patch}'
+assembly-file-versioning-format: '{Major}.{Minor}.{Patch}.{WeightedPreReleaseNumber ?? 0}'
+branches:
+  master:
+    is-mainline: true
+    increment: None
+  major:
+    regex: ^major[\/-]
+    increment: Major
+    source-branches: ['master']
+  minor:
+    regex: ^minor[\/-]
+    increment: Minor
+    source-branches: ['master', 'support']
+  patch:
+    regex: ^patch[\/-]
+    increment: Patch
+    source-branches: ['master', 'support']
+  support:
+    is-mainline: true
+    regex: ^support[/-]
+    tag: ''
+    increment: None
+    source-branches: ['master']
+*/
+
+        var configuration = GitFlowConfigurationBuilder.New
+            .WithBranch(MainBranch, builder => builder
+                .WithVersioningMode(VersioningMode.Mainline)
+                .WithIncrement(IncrementStrategy.None)
+                .WithIsMainline(true))
+            .WithBranch("major", builder => builder
+                .WithRegularExpression("^major[\\/-]")
+                .WithIncrement(IncrementStrategy.Major)
+                .WithSourceBranches(MainBranch))
+            .WithBranch("minor", builder => builder
+                .WithRegularExpression("^minor[\\/-]")
+                .WithIncrement(IncrementStrategy.Minor)
+                .WithSourceBranches(MainBranch))
+            .WithBranch("patch", builder => builder
+                .WithRegularExpression("^patch[\\/-]")
+                .WithIncrement(IncrementStrategy.Patch)
+                .WithSourceBranches(MainBranch))
+            .WithBranch("support", builder => builder
+                .WithVersioningMode(VersioningMode.Mainline)
+                .WithIncrement(IncrementStrategy.None)
+                .WithRegularExpression("^support[\\/-]")
+                .WithIsMainline(true)
+                .WithSourceBranches(MainBranch))
+            .Build();
+
+        // implement history from the issue
+        using var fixture = new EmptyRepositoryFixture();
+        fixture.MakeACommit("First");
+        fixture.MakeACommit("New file added");
+        fixture.ApplyTag("v1.0.0");
+        fixture.MakeACommit("Merged PR 123: new feature");
+        fixture.ApplyTag("v2.0.2");
+
+        // three branches, three merges to main
+        fixture.BranchTo("minor/new-feature-1");
+        fixture.MakeACommit("New class added");
+        fixture.Checkout(MainBranch);
+        fixture.MergeNoFF("minor/new-feature-1");
+
+        fixture.BranchTo("minor/new-feature-2");
+        fixture.MakeACommit("New class added");
+        fixture.Checkout(MainBranch);
+        fixture.MergeNoFF("minor/new-feature-2");
+
+        fixture.BranchTo("minor/new-feature-3");
+        fixture.MakeACommit("New class added");
+        fixture.Checkout(MainBranch);
+        fixture.MergeNoFF("minor/new-feature-3");
+
+        fixture.ApplyTag("v2.1.0");
+
+        // minor branch squashed
+        fixture.MakeACommit("Merged PR 127: squashed feature");
+        fixture.ApplyTag("v2.6.0");
+
+        // let's implement a breaking change
+        fixture.BranchTo("major/breaking-change");
+        fixture.MakeACommit("Breaking change implemented");
+
+        fixture.AssertFullSemver("3.0.0-breaking-change.1", configuration);
+    }
 }
diff --git a/src/GitVersion.Testing/GitTestExtensions.cs b/src/GitVersion.Testing/GitTestExtensions.cs
index e4a5661608..a8969b76db 100644
--- a/src/GitVersion.Testing/GitTestExtensions.cs
+++ b/src/GitVersion.Testing/GitTestExtensions.cs
@@ -11,7 +11,8 @@ public static class GitTestExtensions
 
     public static void MergeNoFF(this IRepository repository, string branch) => MergeNoFF(repository, branch, Generate.SignatureNow());
 
-    public static void MergeNoFF(this IRepository repository, string branch, Signature sig) => repository.Merge(repository.Branches[branch], sig, new MergeOptions
+    public static void MergeNoFF(this IRepository repository, string branch, Signature sig) =>
+        repository.Merge(repository.Branches[branch], sig, new MergeOptions
     {
         FastForwardStrategy = FastForwardStrategy.NoFastForward
     });