feat: merge save + preview (crossfade render, duration guard, ffplay preview)

2026-07-02 16:18:29 +02:00
parent b8aa1606d8
commit 3922fc5174
2 changed files with 162 additions and 9 deletions
@@ -459,3 +459,70 @@ def test_merge_add_stores_duration_role(win, tmp_path):
    win._merge_add_paths([str(a)])
    # empty fixture -> ffprobe fails -> duration is None; M4 must tolerate None
    assert win._merge_list.item(0).data(Qt.ItemDataRole.UserRole + 1) is None
+
+
+def test_merge_save_builds_command(win, tmp_path, monkeypatch):
+    import main as m, pytest
+    from PyQt6.QtCore import Qt
+    a = tmp_path / "a.wav"; b = tmp_path / "b.wav"; a.write_bytes(b""); b.write_bytes(b"")
+    win._merge_list.clear()
+    win._merge_add_paths([str(a), str(b)])
+    win._merge_list.item(0).setData(Qt.ItemDataRole.UserRole + 1, 5.0)   # long enough
+    win._merge_list.item(1).setData(Qt.ItemDataRole.UserRole + 1, 5.0)
+    win._spn_crossfade.setValue(0.75)
+    seen = {}
+    class _Stop(Exception): pass
+    def fake(clips, xf, out):
+        seen.update(clips=clips, xf=xf, out=out); raise _Stop
+    monkeypatch.setattr(m, "build_crossfade_merge_command", fake)
+    monkeypatch.setattr(m.QFileDialog, "getSaveFileName",
+                        staticmethod(lambda *a, **k: (str(tmp_path / "m.wav"), "")))
+    with pytest.raises(_Stop):
+        win._on_merge_save()
+    assert seen["clips"] == [str(a), str(b)]
+    assert seen["xf"] == 0.75
+    assert seen["out"].endswith(".wav")
+
+
+def test_merge_save_blocks_short_clip(win, tmp_path, monkeypatch):
+    import main as m
+    from PyQt6.QtCore import Qt
+    a = tmp_path / "a.wav"; b = tmp_path / "b.wav"; a.write_bytes(b""); b.write_bytes(b"")
+    win._merge_list.clear()
+    win._merge_add_paths([str(a), str(b)])
+    win._merge_list.item(0).setData(Qt.ItemDataRole.UserRole + 1, 0.1)   # shorter than crossfade
+    win._merge_list.item(1).setData(Qt.ItemDataRole.UserRole + 1, 5.0)
+    win._spn_crossfade.setValue(0.5)
+    calls = {"n": 0}
+    monkeypatch.setattr(m, "build_crossfade_merge_command",
+                        lambda *a, **k: calls.__setitem__("n", calls["n"] + 1) or [])
+    monkeypatch.setattr(m.QFileDialog, "getSaveFileName",
+                        staticmethod(lambda *a, **k: (_ for _ in ()).throw(AssertionError("dialog opened"))))
+    win._on_merge_save()            # guard must block before dialog/builder
+    assert calls["n"] == 0
+
+
+def test_merge_save_empty_is_noop(win):
+    win._merge_list.clear()
+    win._on_merge_save()           # no raise, no dialog
+
+
+def test_merge_preview_blocks_short_clip(win, tmp_path, monkeypatch):
+    import main as m
+    from PyQt6.QtCore import Qt
+    a = tmp_path / "a.wav"; b = tmp_path / "b.wav"; a.write_bytes(b""); b.write_bytes(b"")
+    win._merge_list.clear()
+    win._merge_add_paths([str(a), str(b)])
+    win._merge_list.item(0).setData(Qt.ItemDataRole.UserRole + 1, 0.1)
+    win._merge_list.item(1).setData(Qt.ItemDataRole.UserRole + 1, 5.0)
+    win._spn_crossfade.setValue(0.5)
+    calls = {"n": 0}
+    monkeypatch.setattr(m, "build_crossfade_merge_command",
+                        lambda *a, **k: calls.__setitem__("n", calls["n"] + 1) or [])
+    win._on_merge_preview()
+    assert calls["n"] == 0
+
+
+def test_merge_preview_empty_is_noop(win):
+    win._merge_list.clear()
+    win._on_merge_preview()