Add String and &String convert for PathAndQuery (#450)

When building a URI, it is not possible to provide neither String nor
&String, which is useful when adding a path_and_query from a string
built using format!.

This commit adds implementation of From<String> and From<&String> for
PathAndQuery.

src/uri/builder.rs

@@ -152,3 +152,46 @@ impl Default for Builder {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn build_from_str() {
+        let uri = Builder::new()
+            .scheme(Scheme::HTTP)
+            .authority("hyper.rs")
+            .path_and_query("/foo?a=1")
+            .build()
+            .unwrap();
+        assert_eq!(uri.scheme_str(), Some("http"));
+        assert_eq!(uri.authority().unwrap().host(), "hyper.rs");
+        assert_eq!(uri.path(), "/foo");
+        assert_eq!(uri.query(), Some("a=1"));
+    }
+
+    #[test]
+    fn build_from_string() {
+        for i in 1..10 {
+            let uri = Builder::new()
+                .path_and_query(format!("/foo?a={}", i))
+                .build()
+                .unwrap();
+            let expected_query = format!("a={}", i);
+            assert_eq!(uri.path(), "/foo");
+            assert_eq!(uri.query(), Some(expected_query.as_str()));
+        }
+    }
+
+    #[test]
+    fn build_from_string_ref() {
+        for i in 1..10 {
+            let p_a_q = format!("/foo?a={}", i);
+            let uri = Builder::new().path_and_query(&p_a_q).build().unwrap();
+            let expected_query = format!("a={}", i);
+            assert_eq!(uri.path(), "/foo");
+            assert_eq!(uri.query(), Some(expected_query.as_str()));
+        }
+    }
+}

src/uri/path.rs

@@ -279,6 +279,22 @@ impl<'a> TryFrom<&'a str> for PathAndQuery {
     }
 }
 
+impl TryFrom<String> for PathAndQuery {
+    type Error = InvalidUri;
+    #[inline]
+    fn try_from(s: String) -> Result<Self, Self::Error> {
+        TryFrom::try_from(s.as_bytes())
+    }
+}
+
+impl TryFrom<&String> for PathAndQuery {
+    type Error = InvalidUri;
+    #[inline]
+    fn try_from(s: &String) -> Result<Self, Self::Error> {
+        TryFrom::try_from(s.as_bytes())
+    }
+}
+
 impl FromStr for PathAndQuery {
     type Err = InvalidUri;
     #[inline]