cmake: enable math_opt solver_test.py

ortools/math_opt/core/python/CMakeLists.txt

@@ -42,7 +42,6 @@ add_library(${PROJECT_NAMESPACE}::math_opt_pybind11 ALIAS math_opt_pybind11)
 if(BUILD_TESTING)
   file(GLOB PYTHON_SRCS "*_test.py")
   list(FILTER PYTHON_SRCS EXCLUDE REGEX ".*/solver_gurobi_test.py") # need gurobi
-  list(FILTER PYTHON_SRCS EXCLUDE REGEX ".*/solver_test.py") # need google3.testing.pybase.parameterized
   foreach(FILE_NAME IN LISTS PYTHON_SRCS)
     add_python_test(
       FILE_NAME ${FILE_NAME}

ortools/math_opt/core/python/solver_test.py

@@ -15,6 +15,7 @@
 import threading
 from typing import Callable, Optional, Sequence
 import unittest
+from absl.testing import parameterized
 from pybind11_abseil.status import StatusNotOk
 from ortools.math_opt import callback_pb2
 from ortools.math_opt import model_parameters_pb2