merge(layer-b): multi-worktree batch-merge cockpit

tests/ClaudeDo.Ui.Tests/ViewModels/WorktreesOverviewBatchMergeTests.cs

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+using ClaudeDo.Data.Models;
+using ClaudeDo.Ui.Services;
+using ClaudeDo.Ui.ViewModels.Modals;
+using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
+using Xunit;
+
+namespace ClaudeDo.Ui.Tests.ViewModels;
+
+public class WorktreesOverviewBatchMergeTests
+{
+    private static WorktreeOverviewRowViewModel ActiveRow(string id) => new()
+    {
+        TaskId = id,
+        TaskTitle = $"Task {id}",
+        TaskStatus = TaskStatus.WaitingForReview,
+        State = WorktreeState.Active,
+    };
+
+    [Fact]
+    public void Row_outcome_helpers_reflect_state()
+    {
+        var row = ActiveRow("a");
+        Assert.Equal(BatchMergeOutcome.None, row.MergeOutcome);
+        Assert.False(row.IsConflict);
+
+        row.MergeOutcome = BatchMergeOutcome.Conflict;
+        Assert.True(row.IsConflict);
+
+        row.MergeOutcome = BatchMergeOutcome.Merged;
+        Assert.False(row.IsConflict);
+    }
+
+    private static WorktreesOverviewModalViewModel NewVm() =>
+        new(new ClaudeDo.Ui.Services.WorkerClient("http://127.0.0.1:1/hub"), () => null!);
+
+    private static MergeResultDto Merged() => new("merged", System.Array.Empty<string>(), null);
+    private static MergeResultDto Conflict() => new("conflict", new[] { "f.cs" }, null);
+    private static MergeResultDto Blocked() => new("blocked", System.Array.Empty<string>(), "blocked");
+
+    [Fact]
+    public async System.Threading.Tasks.Task MergeSelected_only_processes_checked_active_rows()
+    {
+        var vm = NewVm();
+        var a = ActiveRow("a"); a.IsChecked = true;
+        var b = ActiveRow("b"); b.IsChecked = false;
+        var c = ActiveRow("c"); c.IsChecked = true; c.State = WorktreeState.Merged;
+        vm.Rows.Add(a); vm.Rows.Add(b); vm.Rows.Add(c);
+        vm.SelectedTarget = "main";
+
+        var seen = new System.Collections.Generic.List<string>();
+        await vm.MergeSelectedAsync((id, target, remove, msg) =>
+        {
+            seen.Add(id);
+            Assert.Equal("main", target);
+            Assert.False(remove);
+            return System.Threading.Tasks.Task.FromResult(Merged());
+        });
+
+        Assert.Equal(new[] { "a" }, seen);
+        Assert.Equal(BatchMergeOutcome.Merged, a.MergeOutcome);
+        Assert.False(a.IsChecked);
+    }
+
+    [Fact]
+    public async System.Threading.Tasks.Task MergeSelected_continues_past_conflict_and_collects_it()
+    {
+        var vm = NewVm();
+        var a = ActiveRow("a"); a.IsChecked = true;
+        var b = ActiveRow("b"); b.IsChecked = true;
+        var c = ActiveRow("c"); c.IsChecked = true;
+        vm.Rows.Add(a); vm.Rows.Add(b); vm.Rows.Add(c);
+        vm.SelectedTarget = "main";
+
+        await vm.MergeSelectedAsync((id, target, remove, msg) =>
+            System.Threading.Tasks.Task.FromResult(id == "b" ? Conflict() : Merged()));
+
+        Assert.Equal(BatchMergeOutcome.Merged, a.MergeOutcome);
+        Assert.Equal(BatchMergeOutcome.Conflict, b.MergeOutcome);
+        Assert.Equal(BatchMergeOutcome.Merged, c.MergeOutcome);
+        Assert.Contains(b, vm.ConflictRows);
+        Assert.Single(vm.ConflictRows);
+    }
+
+    [Fact]
+    public async System.Threading.Tasks.Task MergeSelected_maps_blocked_and_exception_to_failure_outcomes()
+    {
+        var vm = NewVm();
+        var a = ActiveRow("a"); a.IsChecked = true;
+        var b = ActiveRow("b"); b.IsChecked = true;
+        vm.Rows.Add(a); vm.Rows.Add(b);
+        vm.SelectedTarget = "main";
+
+        await vm.MergeSelectedAsync((id, target, remove, msg) => id == "a"
+            ? System.Threading.Tasks.Task.FromResult(Blocked())
+            : throw new System.InvalidOperationException("boom"));
+
+        Assert.Equal(BatchMergeOutcome.Blocked, a.MergeOutcome);
+        Assert.Equal(BatchMergeOutcome.Failed, b.MergeOutcome);
+        Assert.Empty(vm.ConflictRows);
+        Assert.False(vm.IsMerging);
+    }
+
+    [Fact]
+    public async System.Threading.Tasks.Task MergeSelected_noop_when_no_target()
+    {
+        var vm = NewVm();
+        var a = ActiveRow("a"); a.IsChecked = true;
+        vm.Rows.Add(a);
+        vm.SelectedTarget = null;
+
+        var called = false;
+        await vm.MergeSelectedAsync((id, t, r, m) => { called = true; return System.Threading.Tasks.Task.FromResult(Merged()); });
+
+        Assert.False(called);
+        Assert.Equal(BatchMergeOutcome.None, a.MergeOutcome);
+    }
+
+    [Fact]
+    public void SelectedCount_tracks_checked_active_rows()
+    {
+        var vm = NewVm();
+        var a = ActiveRow("a");
+        var b = ActiveRow("b");
+        var merged = ActiveRow("c"); merged.State = WorktreeState.Merged;
+        vm.AddRowForTest(a); vm.AddRowForTest(b); vm.AddRowForTest(merged);
+
+        Assert.Equal(0, vm.SelectedCount);
+        a.IsChecked = true;
+        Assert.Equal(1, vm.SelectedCount);
+        b.IsChecked = true;
+        merged.IsChecked = true;
+        Assert.Equal(2, vm.SelectedCount);
+        a.IsChecked = false;
+        Assert.Equal(1, vm.SelectedCount);
+    }
+
+    [Fact]
+    public void ResolveConflict_invokes_seam_with_task_and_target()
+    {
+        var vm = NewVm();
+        vm.SelectedTarget = "release";
+        var row = ActiveRow("x"); row.MergeOutcome = BatchMergeOutcome.Conflict;
+
+        (string Task, string Target)? captured = null;
+        vm.RequestConflictResolution = (taskId, target) => { captured = (taskId, target); return System.Threading.Tasks.Task.CompletedTask; };
+
+        vm.ResolveConflictCommand.Execute(row);
+
+        Assert.Equal(("x", "release"), captured);
+    }
+
+    [Fact]
+    public void MergeAll_canExecute_requires_target_selection_and_idle()
+    {
+        var vm = NewVm();
+        var a = ActiveRow("a");
+        vm.AddRowForTest(a);
+
+        Assert.False(vm.MergeAllCommand.CanExecute(null));
+        a.IsChecked = true;
+        Assert.False(vm.MergeAllCommand.CanExecute(null));
+        vm.SelectedTarget = "main";
+        Assert.True(vm.MergeAllCommand.CanExecute(null));
+        vm.IsMerging = true;
+        Assert.False(vm.MergeAllCommand.CanExecute(null));
+    }
+}