CLN/TST: Cleanup tests in test_ujson.py (#21739)

Author: gfyoung

pandas/conftest.py

@@ -250,7 +250,7 @@ def string_dtype(request):
     return request.param
 
 
-@pytest.fixture(params=["float32", "float64"])
+@pytest.fixture(params=[float, "float32", "float64"])
 def float_dtype(request):
     """
     Parameterized fixture for float dtypes.
@@ -262,7 +262,7 @@ def float_dtype(request):
     return request.param
 
 
-@pytest.fixture(params=["complex64", "complex128"])
+@pytest.fixture(params=[complex, "complex64", "complex128"])
 def complex_dtype(request):
     """
     Parameterized fixture for complex dtypes.
@@ -275,7 +275,7 @@ def complex_dtype(request):
 
 
 UNSIGNED_INT_DTYPES = ["uint8", "uint16", "uint32", "uint64"]
-SIGNED_INT_DTYPES = ["int8", "int16", "int32", "int64"]
+SIGNED_INT_DTYPES = [int, "int8", "int16", "int32", "int64"]
 ALL_INT_DTYPES = UNSIGNED_INT_DTYPES + SIGNED_INT_DTYPES