skip serialization if value equals to default

yaserde/tests/der_default.rs

@@ -29,8 +29,7 @@ fn de_default_field_string() {
     background: String,
   }
 
-  let content =
-    "<?xml version=\"1.0\" encoding=\"utf-8\"?><base></base>";
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base />";
   convert_and_validate!(
     content,
     XmlStruct,
@@ -53,15 +52,8 @@ fn de_default_field_boolean() {
     background: bool,
   }
 
-  let content =
-    "<?xml version=\"1.0\" encoding=\"utf-8\"?><base></base>";
-  convert_and_validate!(
-    content,
-    XmlStruct,
-    XmlStruct {
-      background: true,
-    }
-  );
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base />";
+  convert_and_validate!(content, XmlStruct, XmlStruct { background: true });
 }
 
 #[test]
@@ -77,15 +69,8 @@ fn de_default_field_number() {
     background: u8,
   }
 
-  let content =
-    "<?xml version=\"1.0\" encoding=\"utf-8\"?><base></base>";
-  convert_and_validate!(
-    content,
-    XmlStruct,
-    XmlStruct {
-      background: 6,
-    }
-  );
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base />";
+  convert_and_validate!(content, XmlStruct, XmlStruct { background: 6 });
 }
 
 #[test]
@@ -101,8 +86,7 @@ fn de_default_attribute_string() {
     background: String,
   }
 
-  let content =
-    "<?xml version=\"1.0\" encoding=\"utf-8\"?><base></base>";
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base />";
   convert_and_validate!(
     content,
     XmlStruct,

yaserde/tests/der_option.rs

@@ -121,22 +121,28 @@ fn de_option() {
 fn de_option_struct() {
   #[derive(YaDeserialize, Debug, PartialEq)]
   struct Test {
-    field: SubTest
+    field: SubTest,
   }
 
   #[derive(YaDeserialize, Debug, PartialEq)]
   struct SubTest {
-    content: Option<String>
+    content: Option<String>,
   }
 
   impl Default for SubTest {
     fn default() -> Self {
-      SubTest {
-        content: None
-      }
+      SubTest { content: None }
     }
   }
 
-  convert_and_validate!(Test, Some(Test{field: SubTest{content: Some("value".to_string())}}), Some("<field><content>value</content></field>"));
+  convert_and_validate!(
+    Test,
+    Some(Test {
+      field: SubTest {
+        content: Some("value".to_string())
+      }
+    }),
+    Some("<field><content>value</content></field>")
+  );
   convert_and_validate!(Test, None, None);
 }

yaserde/tests/se_default.rs

@@ -0,0 +1,110 @@
+#[macro_use]
+extern crate log;
+extern crate xml;
+extern crate yaserde;
+#[macro_use]
+extern crate yaserde_derive;
+
+use std::io::Write;
+use yaserde::ser::to_string;
+use yaserde::YaSerialize;
+
+macro_rules! convert_and_validate {
+  ($model:expr, $content:expr) => {
+    let data: Result<String, String> = to_string(&$model);
+    assert_eq!(data, Ok(String::from($content)));
+  };
+}
+
+#[test]
+fn se_default_field_string() {
+  fn default_string() -> String {
+    "my_default_value".to_string()
+  }
+
+  #[derive(YaSerialize, PartialEq, Debug)]
+  #[yaserde(root = "base")]
+  pub struct XmlStruct {
+    #[yaserde(default = "default_string")]
+    background: String,
+  }
+
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base />";
+  convert_and_validate!(
+    XmlStruct {
+      background: "my_default_value".to_string(),
+    },
+    content
+  );
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base><background>my_value</background></base>";
+  convert_and_validate!(
+    XmlStruct {
+      background: "my_value".to_string(),
+    },
+    content
+  );
+}
+
+#[test]
+fn se_default_field_boolean() {
+  fn default_boolean() -> bool {
+    true
+  }
+
+  #[derive(YaSerialize, PartialEq, Debug)]
+  #[yaserde(root = "base")]
+  pub struct XmlStruct {
+    #[yaserde(default = "default_boolean")]
+    background: bool,
+  }
+
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base />";
+  convert_and_validate!(XmlStruct { background: true }, content);
+
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base><background>false</background></base>";
+  convert_and_validate!(
+    XmlStruct {
+      background: false,
+    },
+    content
+  );
+}
+
+#[test]
+fn se_default_field_number() {
+  fn default_number() -> u8 {
+    6
+  }
+
+  #[derive(YaSerialize, PartialEq, Debug)]
+  #[yaserde(root = "base")]
+  pub struct XmlStruct {
+    #[yaserde(default = "default_number")]
+    background: u8,
+  }
+
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base />";
+  convert_and_validate!(XmlStruct { background: 6 }, content);
+}
+
+#[test]
+fn se_default_attribute_string() {
+  fn default_string() -> String {
+    "my_default_value".to_string()
+  }
+
+  #[derive(YaSerialize, PartialEq, Debug)]
+  #[yaserde(root = "base")]
+  pub struct XmlStruct {
+    #[yaserde(attribute, default = "default_string")]
+    background: String,
+  }
+
+  let content = "<?xml version=\"1.0\" encoding=\"utf-8\"?><base />";
+  convert_and_validate!(
+    XmlStruct {
+      background: "my_default_value".to_string(),
+    },
+    content
+  );
+}

yaserde/tests/se_option.rs

@@ -124,22 +124,28 @@ fn ser_option() {
 fn de_option_struct() {
   #[derive(YaSerialize, Debug, PartialEq)]
   struct Test {
-    field: SubTest
+    field: SubTest,
   }
 
   #[derive(YaSerialize, Debug, PartialEq)]
   struct SubTest {
-    content: Option<String>
+    content: Option<String>,
   }
 
   impl Default for SubTest {
     fn default() -> Self {
-      SubTest {
-        content: None
-      }
+      SubTest { content: None }
     }
   }
 
-  convert_and_validate!(Test, Some(Test{field: SubTest{content: Some("value".to_string())}}), Some("<field><content>value</content></field>"));
+  convert_and_validate!(
+    Test,
+    Some(Test {
+      field: SubTest {
+        content: Some("value".to_string())
+      }
+    }),
+    Some("<field><content>value</content></field>")
+  );
   convert_and_validate!(Test, None, None);
 }