clean-up: get rid of misplaced cfg(test)

Signed-off-by: Popa <dpopa@amazon.com>
Signed-off-by: YUAN LYU <lyuyuan92@gmail.com>

src/common/headers.rs

@@ -179,15 +179,6 @@ impl Headers {
         self.expect
     }
 
-    #[cfg(test)]
-    pub fn new(content_length: i32, expect: bool, chunked: bool) -> Self {
-        Self {
-            content_length,
-            expect,
-            chunked,
-        }
-    }
-
     /// Parses a byte slice into a Headers structure for a HTTP request.
     ///
     /// The byte slice is expected to have the following format: </br>
@@ -299,6 +290,16 @@ impl MediaType {
 mod tests {
     use super::*;
 
+    impl Headers {
+        pub fn new(content_length: i32, expect: bool, chunked: bool) -> Self {
+            Self {
+                content_length,
+                expect,
+                chunked,
+            }
+        }
+    }
+
     #[test]
     fn test_default() {
         let headers = Headers::default();