1 files changed, 18 insertions, 0 deletions
diff --git a/internal/thread/thread_test.go b/internal/thread/thread_test.go
new file mode 100644
index 0000000..146ae0c
--- /dev/null
+++ b/internal/thread/thread_test.go
@@ -0,0 +1,18 @@
+package thread
+
+import (
+	"testing"
+
+	"aegis/internal/nntp"
+)
+
+func TestBuildUsesLastReference(t *testing.T) {
+	roots := Build([]nntp.ArticleHeader{
+		{Number: 1, MessageID: "<root@example>", Subject: "topic"},
+		{Number: 2, MessageID: "<reply@example>", References: "<root@example>"},
+		{Number: 3, MessageID: "<nested@example>", References: "<root@example> <reply@example>"},
+	})
+	if len(roots) != 1 || len(roots[0].Children) != 1 || len(roots[0].Children[0].Children) != 1 {
+		t.Fatalf("unexpected thread tree: %#v", roots)
+	}
+}