(to squash) add unit tests for ReasonPhrase validation

src/ext/h1_reason_phrase.rs

@@ -161,9 +161,61 @@ const fn find_invalid_byte(bytes: &[u8]) -> Option<u8> {
     while i < bytes.len() {
         let b = bytes[i];
         if !is_valid_byte(b) {
-            return Some(b)
+            return Some(b);
         }
         i += 1;
     }
     None
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn basic_valid() {
+        const PHRASE: &'static [u8] = b"OK";
+        assert_eq!(ReasonPhrase::from_static(PHRASE).as_bytes(), PHRASE);
+        assert_eq!(ReasonPhrase::try_from(PHRASE).unwrap().as_bytes(), PHRASE);
+    }
+
+    #[test]
+    fn empty_valid() {
+        const PHRASE: &'static [u8] = b"";
+        assert_eq!(ReasonPhrase::from_static(PHRASE).as_bytes(), PHRASE);
+        assert_eq!(ReasonPhrase::try_from(PHRASE).unwrap().as_bytes(), PHRASE);
+    }
+
+    #[test]
+    fn obs_text_valid() {
+        const PHRASE: &'static [u8] = b"hyp\xe9r";
+        assert_eq!(ReasonPhrase::from_static(PHRASE).as_bytes(), PHRASE);
+        assert_eq!(ReasonPhrase::try_from(PHRASE).unwrap().as_bytes(), PHRASE);
+    }
+
+    const NEWLINE_PHRASE: &'static [u8] = b"hyp\ner";
+
+    #[test]
+    #[should_panic]
+    fn newline_invalid_panic() {
+        ReasonPhrase::from_static(NEWLINE_PHRASE);
+    }
+
+    #[test]
+    fn newline_invalid_err() {
+        assert!(ReasonPhrase::try_from(NEWLINE_PHRASE).is_err());
+    }
+
+    const CR_PHRASE: &'static [u8] = b"hyp\rer";
+
+    #[test]
+    #[should_panic]
+    fn cr_invalid_panic() {
+        ReasonPhrase::from_static(CR_PHRASE);
+    }
+
+    #[test]
+    fn cr_invalid_err() {
+        assert!(ReasonPhrase::try_from(CR_PHRASE).is_err());
+    }
+}