Parse to NaiveDateTime in parse_rfc850 test

The format string doesn't contain any offset info.

Author: pitdicker

src/format/parse.rs

@@ -598,7 +598,7 @@ fn parse_rfc3339_relaxed<'a>(parsed: &mut Parsed, mut s: &'a str) -> ParseResult
 #[cfg(test)]
 mod tests {
     use crate::format::*;
-    use crate::{DateTime, FixedOffset, TimeZone, Timelike, Utc};
+    use crate::{DateTime, FixedOffset, NaiveDateTime, TimeZone, Timelike, Utc};
 
     macro_rules! parsed {
         ($($k:ident: $v:expr),*) => (#[allow(unused_mut)] {
@@ -1704,7 +1704,10 @@ mod tests {
         assert_eq!(dt.format(RFC850_FMT).to_string(), "Sunday, 06-Nov-94 08:49:37 GMT");
 
         // Check that it parses correctly
-        assert_eq!(Ok(dt), Utc.datetime_from_str("Sunday, 06-Nov-94 08:49:37 GMT", RFC850_FMT));
+        assert_eq!(
+            NaiveDateTime::parse_from_str("Sunday, 06-Nov-94 08:49:37 GMT", RFC850_FMT),
+            Ok(dt.naive_utc())
+        );
 
         // Check that the rest of the weekdays parse correctly (this test originally failed because
         // Sunday parsed incorrectly).
@@ -1736,7 +1739,7 @@ mod tests {
         ];
 
         for val in &testdates {
-            assert_eq!(Ok(val.0), Utc.datetime_from_str(val.1, RFC850_FMT));
+            assert_eq!(NaiveDateTime::parse_from_str(val.1, RFC850_FMT), Ok(val.0.naive_utc()));
         }
 
         let test_dates_fail = [
@@ -1755,7 +1758,7 @@ mod tests {
         ];
 
         for val in &test_dates_fail {
-            assert!(Utc.datetime_from_str(val, RFC850_FMT).is_err());
+            assert!(NaiveDateTime::parse_from_str(val, RFC850_FMT).is_err());
         }
     }