Add more test for symbol_util

Author: BichengYing

cirq-google/cirq_google/study/symbol_util_test.py

@@ -0,0 +1,48 @@
+# Copyright 2025 The Cirq Developers
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import pytest
+import sympy
+import tunits as tu
+
+import cirq
+from cirq_google.study import symbol_util as su
+
+
+def test_dict_param_name():
+    d = {"a": 54, "b": sympy.Symbol("t"), "c": sympy.Symbol("t"), "d": "sd"}
+
+    assert su.dict_param_name(None) == set()
+    assert su.dict_param_name(d) == {"t"}
+
+
+@pytest.mark.parametrize(
+    "d,expected",
+    [
+        (None, False),
+        ({}, False),
+        ({"a": 50}, False),
+        ({"a": 54, "b": sympy.Symbol("t"), "c": sympy.Symbol("t"), "d": "sd"}, True),
+    ],
+)
+def test_is_parameterized_dict(d, expected):
+    assert su.is_parameterized_dict(d) == expected
+
+
+def test_direct_symbol_replacement():
+    value_list = [sympy.Symbol("t"), sympy.Symbol("v"), sympy.Symbol("z"), 123, "fd"]
+    resolver = cirq.ParamResolver({"t": 5 * tu.ns, sympy.Symbol("v"): 8 * tu.GHz})
+    value_resolved = [su.direct_symbol_replacement(v, resolver) for v in value_list]
+
+    assert value_resolved == [5 * tu.ns, 8 * tu.GHz, sympy.Symbol("z"), 123, "fd"]