Add a test to make sure non-finite fields are skipped

Author: Enric Sala

tests/SeriesTest.m

@@ -181,6 +181,17 @@ function every_property_is_used(test)
             test.verifyEqual(s.toLine(), exp);
         end
 
+        function skips_nonfinite_fields(test)
+            s = Series('weather') ...
+                .time(test.Time) ...
+                .fields('temperature', [NaN, -3.5]) ...
+                .fields('humidity', [60.7, Inf]);
+            exp = [ ...
+                'weather humidity=60.7 1529933525520' newline ...
+                'weather temperature=-3.5 1529933581618'];
+            test.verifyEqual(s.toLine(), exp);
+        end
+        
         function skips_nonfinite_samples(test)
             s = Series('weather') ...
                 .time(test.Time) ...