add unit test on deserializer

yaserde/src/de/mod.rs

@@ -53,16 +53,18 @@ impl<'de, R: Read> Deserializer<R> {
 
   pub fn inner_next(&mut self) -> Result<XmlEvent, String> {
     loop {
-      if let Ok(next) = self.reader.next() {
-        match next {
-          XmlEvent::StartDocument { .. }
-          | XmlEvent::ProcessingInstruction { .. }
-          | XmlEvent::Comment(_) => { /* skip */ }
-          other => return Ok(other),
+      match self.reader.next() {
+        Ok(next) => {
+          match next {
+            XmlEvent::StartDocument { .. }
+            | XmlEvent::ProcessingInstruction { .. }
+            | XmlEvent::Comment(_) => { /* skip */ }
+            other => return Ok(other),
+          }
+        }
+        Err(msg) => {
+          return Err(msg.msg().to_string());
         }
-      } else {
-        println!("{:?}", self.peeked);
-        return Err(String::from("bad content"));
       }
     }
   }

yaserde/tests/errors.rs

@@ -0,0 +1,38 @@
+#[macro_use]
+extern crate log;
+extern crate xml;
+extern crate yaserde;
+#[macro_use]
+extern crate yaserde_derive;
+
+use std::io::Read;
+use yaserde::YaDeserialize;
+use yaserde::de::from_str;
+
+#[test]
+fn de_no_content() {
+  #[derive(YaDeserialize, PartialEq, Debug)]
+  #[yaserde(root = "book")]
+  pub struct Book {
+    author: String,
+    title: String,
+  }
+
+  let content = "";
+  let loaded: Result<Book, String> = from_str(content);
+  assert_eq!(loaded, Err(String::from("Unexpected end of stream: no root element found")));
+}
+
+#[test]
+fn de_wrong_end_balise() {
+  #[derive(YaDeserialize, PartialEq, Debug)]
+  #[yaserde(root = "book")]
+  pub struct Book {
+    author: String,
+    title: String,
+  }
+
+  let content = "<book><author>Antoine de Saint-Exupéry<title>Little prince</title></book>";
+  let loaded: Result<Book, String> = from_str(content);
+  assert_eq!(loaded, Err(String::from("Unexpected closing tag: book, expected author")));
+}