feat: add AcceptRanges none util

Author: tottoto

src/common/accept_ranges.rs

@@ -37,6 +37,7 @@ derive_header! {
 }
 
 const ACCEPT_RANGES_BYTES: &str = "bytes";
+const ACCEPT_RANGES_NONE: &str = "none";
 
 impl AcceptRanges {
     /// A constructor to easily create the common `Accept-Ranges: bytes` header.
@@ -48,6 +49,16 @@ impl AcceptRanges {
     pub fn is_bytes(&self) -> bool {
         self.0.value == ACCEPT_RANGES_BYTES
     }
+
+    /// A constructor to easily create the common `Accept-Ranges: none` header.
+    pub fn none() -> Self {
+        AcceptRanges(HeaderValue::from_static(ACCEPT_RANGES_NONE).into())
+    }
+
+    /// Check if the unit is `none`.
+    pub fn is_none(&self) -> bool {
+        self.0.value == ACCEPT_RANGES_NONE
+    }
 }
 
 #[cfg(test)]
@@ -59,6 +70,7 @@ mod tests {
         test_decode(&[s]).unwrap()
     }
 
+    // bytes
     #[test]
     fn bytes_constructor() {
         assert_eq!(accept_ranges("bytes"), AcceptRanges::bytes());
@@ -78,4 +90,25 @@ mod tests {
     fn is_bytes_method_failed_with_not_bytes_ranges() {
         assert!(!accept_ranges("dummy").is_bytes());
     }
+
+    // none
+    #[test]
+    fn none_constructor() {
+        assert_eq!(accept_ranges("none"), AcceptRanges::none());
+    }
+
+    #[test]
+    fn is_none_method_successful_with_none_ranges() {
+        assert!(accept_ranges("none").is_none());
+    }
+
+    #[test]
+    fn is_none_method_successful_with_none_ranges_by_constructor() {
+        assert!(AcceptRanges::none().is_none());
+    }
+
+    #[test]
+    fn is_none_method_failed_with_not_none_ranges() {
+        assert!(!accept_ranges("dummy").is_none());
+    }
 }