test(tasks): add tests for project color threading

Tests verify ProjectColor is populated in BuildTimeline and copied to WidgetItem.

1 files changed, 33 insertions, 0 deletions

diff --git a/internal/handlers/timeline_logic_test.go b/internal/handlers/timeline_logic_test.go
index 89581a3..7b5c47e 100644
--- a/internal/handlers/timeline_logic_test.go
+++ b/internal/handlers/timeline_logic_test.go
@@ -498,6 +498,39 @@ func TestSaveAndGetCalendarEvents(t *testing.T) {
 	}
 }
 
+func TestBuildTimeline_PopulatesProjectColorForNativeTasks(t *testing.T) {
+	s, cleanup := setupTestDB(t)
+	defer cleanup()
+	project, err := s.CreateProject("Sailing prep", "#3B82F6")
+	if err != nil {
+		t.Fatal(err)
+	}
+	now := time.Now()
+	if _, err := s.DB().Exec(`
+		INSERT INTO native_tasks (id, content, due_date, project_id) VALUES ('rec-1', 'Water plants', ?, ?)
+	`, now, project.ID); err != nil {
+		t.Fatal(err)
+	}
+
+	items, err := BuildTimeline(context.Background(), s, now.Add(-time.Hour), now.Add(24*time.Hour))
+	if err != nil {
+		t.Fatalf("BuildTimeline: %v", err)
+	}
+
+	var found *models.TimelineItem
+	for i := range items {
+		if items[i].ID == "rec-1" {
+			found = &items[i]
+		}
+	}
+	if found == nil {
+		t.Fatal("expected to find rec-1 in the timeline")
+	}
+	if found.ProjectColor != "#3B82F6" {
+		t.Errorf("ProjectColor = %q, want %q", found.ProjectColor, "#3B82F6")
+	}
+}
+
 func timePtr(t time.Time) *time.Time {
 	return &t
 }