Issue-785 Draft code for unit tests of normalize function (#982)

* Issue-785 Draft code for unit tests of normalize function

* Linter run on file

* Unit test code changes for assertion

---------

Co-authored-by: Aishwarya Nidhi <aishwaryanidhi@Aishwaryas-Air.cgocable.net>

core/signal_processing/test/test_misc_transformations.py

@@ -275,3 +275,60 @@ def helper(self, input: Union[pd.Series, pd.DataFrame]) -> None:
             expected_column_unique_values,
             expected_signature,
         )
+
+
+# #############################################################################
+
+
+class TestNormalize(hunitest.TestCase):
+    def test1(self):
+        """
+        Check that a simple signal input is normalized correctly.
+        """
+        # Create input data for testing.
+        signal = pd.Series([-7, -6, -5, -1, 0, 2, 3, 4, 8], name="Signals")
+        actual_result = csprmitr.normalize(signal)
+        # Define expected values.
+        expected_length = len(signal)
+        expected_unique_values = None
+        expected_result_signature = r"""
+            Signals
+        0    -0.490098
+        1    -0.420084
+        2    -0.350070
+        3    -0.070014
+        4    0.000000
+        5    0.140028
+        6    0.210042
+        7    0.280056
+        8    0.560112
+        """
+        # Check result.
+        self.check_srs_output(
+            actual_result,
+            expected_length,
+            expected_unique_values,
+            expected_result_signature,
+        )
+
+    def test2(self):
+        """
+        Check that a signal input with NaN values is processed correctly.
+        """
+        # Create input data for testing.
+        signal = pd.Series([-7, -6, -5, -1, np.NaN, 2, 3, 4, 8], name="Signals")
+        with self.assertRaises(AssertionError) as result:
+            csprmitr.normalize(signal)
+        actual_result = str(result.exception)
+        # Define expected values.
+        expected_result_signature = r"""
+        ################################################################################
+        * Failed assertion *
+        cond=False
+        NaNs detected at Index([4], dtype='int64')
+        ################################################################################
+        """
+        # Check result.
+        self.assert_equal(
+            actual_result, expected_result_signature, fuzzy_match=True
+        )