code: def test_strings(self):
      x = pd.Series(
          [
              "This IS a STRING.",
              "Testing AAA",
              "Testing AAA BBB",
              "Testing TEsTIng AA3 AA_33 HELLO",
              "AAA $@()#$@@#$",
          ],
          dtype="string",
      )
      primitive_func = self.primitive().get_function()
      answers = pd.Series([2, 1, 2, 3, 1], dtype="Int64")
      pd.testing.assert_series_equal(
          primitive_func(x).astype("Int64"),
          answers,
          check_names=False,
      )
  
imports: import numpy
  import pandas
  from featuretools.primitives import UpperCaseWordCount
label_desc: Use image node_id 1 for calling the TestUpperCaseWordCount obj's underlying member method code with example usage: obj.test_strings() without return types