Move tests from ``TestComparison`` to functional tests (#5520)

* Remove some redundant tests

1 files changed, 6 insertions, 3 deletions

diff --git a/tests/functional/n/nan_comparison_check.py b/tests/functional/n/nan_comparison_check.py
index b9a720b9a..99b921cde 100644
--- a/tests/functional/n/nan_comparison_check.py
+++ b/tests/functional/n/nan_comparison_check.py
@@ -2,10 +2,12 @@
 # pylint: disable=literal-comparison,comparison-with-itself, import-error
 """Test detection of NaN value comparison."""
 import numpy
+
 x = 42
 a = x is numpy.NaN  # [nan-comparison]
 b = x == numpy.NaN  # [nan-comparison]
-c = x == float('nan')  # [nan-comparison]
+c = x == float("nan")  # [nan-comparison]
+d = x is float("nan")  # [nan-comparison]
 e = numpy.NaN == numpy.NaN  # [nan-comparison]
 f = x is 1
 g = 123 is "123"
@@ -13,9 +15,10 @@ h = numpy.NaN is not x  # [nan-comparison]
 i = numpy.NaN != x  # [nan-comparison]
 
 j = x != numpy.NaN  # [nan-comparison]
-j1 = x != float('nan')  # [nan-comparison]
+j1 = x != float("nan")  # [nan-comparison]
+k = x is not numpy.NaN  # [nan-comparison]
 assert x == numpy.NaN  # [nan-comparison]
-assert x is not float('nan')  # [nan-comparison]
+assert x is not float("nan")  # [nan-comparison]
 if x == numpy.NaN:  # [nan-comparison]
     pass
 z = bool(x is numpy.NaN)  # [nan-comparison]