test(text): cover Russian XSAMPA normalization

tests/test_russian_phonemes.py

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+import pytest
+
+from GPT_SoVITS.text.russian import normalize_xsampa_symbol
+
+
+@pytest.mark.parametrize(
+    ("symbol", "expected"),
+    [
+        ("d'", "D"),
+        ("n'", "N"),
+        ("r'", "R"),
+        ("l'", "L"),
+        ("a:", "A"),
+        ("1", "I"),
+        ("@", "A"),
+        ("6", "A"),
+        ("s`", "S"),
+        ("S`", "S"),
+    ],
+)
+def test_normalize_russian_xsampa_symbol(symbol, expected):
+    assert normalize_xsampa_symbol(symbol) == expected
+
+
+@pytest.mark.parametrize("symbol", ["", "?", "t_s", None])
+def test_normalize_russian_xsampa_symbol_rejects_unsupported_input(symbol):
+    with pytest.raises(ValueError, match="Russian XSAMPA|Unsupported Russian"):
+        normalize_xsampa_symbol(symbol)