Rename the xmpp-parsers directory to parsers

This doesn’t change anything to the name of the crate, just makes
autocompletion easier by not sharing the same prefix as the xmpp crate.

parsers/src/ping.rs

@@ -0,0 +1,71 @@
+// Copyright (c) 2017 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+// Copyright (c) 2017 Maxime “pep” Buquet <pep@bouah.net>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+use crate::iq::IqGetPayload;
+
+generate_empty_element!(
+    /// Represents a ping to the recipient, which must be answered with an
+    /// empty `<iq/>` or with an error.
+    Ping,
+    "ping",
+    PING
+);
+
+impl IqGetPayload for Ping {}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[cfg(not(feature = "disable-validation"))]
+    use crate::util::error::Error;
+    use crate::Element;
+    use std::convert::TryFrom;
+
+    #[test]
+    fn test_size() {
+        assert_size!(Ping, 0);
+    }
+
+    #[test]
+    fn test_simple() {
+        let elem: Element = "<ping xmlns='urn:xmpp:ping'/>".parse().unwrap();
+        Ping::try_from(elem).unwrap();
+    }
+
+    #[test]
+    fn test_serialise() {
+        let elem1 = Element::from(Ping);
+        let elem2: Element = "<ping xmlns='urn:xmpp:ping'/>".parse().unwrap();
+        assert_eq!(elem1, elem2);
+    }
+
+    #[cfg(not(feature = "disable-validation"))]
+    #[test]
+    fn test_invalid() {
+        let elem: Element = "<ping xmlns='urn:xmpp:ping'><coucou/></ping>"
+            .parse()
+            .unwrap();
+        let error = Ping::try_from(elem).unwrap_err();
+        let message = match error {
+            Error::ParseError(string) => string,
+            _ => panic!(),
+        };
+        assert_eq!(message, "Unknown child in ping element.");
+    }
+
+    #[cfg(not(feature = "disable-validation"))]
+    #[test]
+    fn test_invalid_attribute() {
+        let elem: Element = "<ping xmlns='urn:xmpp:ping' coucou=''/>".parse().unwrap();
+        let error = Ping::try_from(elem).unwrap_err();
+        let message = match error {
+            Error::ParseError(string) => string,
+            _ => panic!(),
+        };
+        assert_eq!(message, "Unknown attribute in ping element.");
+    }
+}