Combine constant tests in a loop

Co-authored-by: Henry Moore <[email protected]>
Signed-off-by: Ryan <[email protected]>

rosidl_adapter/test/test_constant.py

@@ -31,14 +31,9 @@ def test_constant_constructor():
         Constant('bool', 'FOO', None)
 
     # NaN is case insensitive in python, so test a few variations.
-    value = Constant('float32', 'FOO', 'nan')
-    value = Constant('float32', 'FOO', 'Nan')
-    value = Constant('float32', 'FOO', 'NaN')
-    value = Constant('float32', 'FOO', 'NAN')
-    value = Constant('float64', 'FOO', 'nan')
-    value = Constant('float64', 'FOO', 'Nan')
-    value = Constant('float64', 'FOO', 'NaN')
-    value = Constant('float64', 'FOO', 'NAN')
+    for nan_string in ['nan','Nan','NaN','NAN','nan','Nan','NaN','NAN']:
+        value = Constant('float32', 'FOO', nan_string)
+        assert isnan(value.value)
 
 
 def test_constant_methods():