add unit tests

issue #9

yaserde/tests/der_default.rs

@@ -0,0 +1,89 @@
+#[macro_use]
+extern crate log;
+extern crate xml;
+extern crate yaserde;
+#[macro_use]
+extern crate yaserde_derive;
+
+use std::io::Read;
+use yaserde::de::from_str;
+use yaserde::YaDeserialize;
+
+macro_rules! convert_and_validate {
+  ($content: expr, $struct: tt, $model: expr) => {
+    let loaded: Result<$struct, String> = from_str($content);
+    assert_eq!(loaded, Ok($model));
+  };
+}
+
+#[test]
+fn de_default_field_string() {
+  fn default_string() -> String {
+    "my_default_value".to_string()
+  }
+
+  #[derive(YaDeserialize, PartialEq, Debug)]
+  #[yaserde(root = "base")]
+  pub struct XmlStruct {
+    #[yaserde(default = "default_string")]
+    background: String,
+  }
+
+  let content =
+    "<?xml version=\"1.0\" encoding=\"utf-8\"?><base></base>";
+  convert_and_validate!(
+    content,
+    XmlStruct,
+    XmlStruct {
+      background: "my_default_value".to_string(),
+    }
+  );
+}
+
+#[test]
+fn de_default_field_boolean() {
+  fn default_boolean() -> bool {
+    true
+  }
+
+  #[derive(YaDeserialize, PartialEq, Debug)]
+  #[yaserde(root = "base")]
+  pub struct XmlStruct {
+    #[yaserde(default = "default_boolean")]
+    background: bool,
+  }
+
+  let content =
+    "<?xml version=\"1.0\" encoding=\"utf-8\"?><base></base>";
+  convert_and_validate!(
+    content,
+    XmlStruct,
+    XmlStruct {
+      background: true,
+    }
+  );
+}
+
+#[test]
+fn de_default_field_number() {
+  fn default_number() -> u8 {
+    6
+  }
+
+  #[derive(YaDeserialize, PartialEq, Debug)]
+  #[yaserde(root = "base")]
+  pub struct XmlStruct {
+    #[yaserde(default = "default_number")]
+    background: u8,
+  }
+
+  let content =
+    "<?xml version=\"1.0\" encoding=\"utf-8\"?><base></base>";
+  convert_and_validate!(
+    content,
+    XmlStruct,
+    XmlStruct {
+      background: 6,
+    }
+  );
+}