feat: TUI 速度曲线栏增加实时速度文字 (当前/峰值/平均)

tests/test_transfer.py

@@ -254,3 +254,19 @@ def test_apply_policy_global_overwrite_keeps_explicit_no():
     answers = {"a.txt": "n", "*": "a"}
     skipped = transfer.apply_policy(conflicts, "ask", answers)
     assert skipped == ["a.txt"]
+
+# ---------- 速度统计 ----------
+
+def test_speed_stats_basic():
+    h = [10 * 1024 * 1024, 20 * 1024 * 1024, 15 * 1024 * 1024]
+    cur, peak, avg = transfer.speed_stats(h)
+    assert cur == 15 * 1024 * 1024
+    assert peak == 20 * 1024 * 1024
+    assert avg == 15 * 1024 * 1024
+
+def test_speed_stats_empty():
+    assert transfer.speed_stats([]) == (0.0, 0.0, 0.0)
+
+def test_speed_stats_single():
+    cur, peak, avg = transfer.speed_stats([8 * 1024 * 1024])
+    assert (cur, peak, avg) == (8 * 1024 * 1024, 8 * 1024 * 1024, 8 * 1024 * 1024)