✨ Allow passing custom XML emitter

Cargo.toml

@@ -18,3 +18,4 @@ serde = { version = "1.0", features = ["derive"] }
 simple_logger = "2.1"
 docmatic = "0.1"
 rstest = "0.12"
+indoc = "2.0.6"

src/ser/mod.rs

@@ -87,7 +87,7 @@
 where
     W: Write,
 {
-    fn new_from_writer(writer: EventWriter<W>) -> Self {
+    pub fn new_from_writer(writer: EventWriter<W>) -> Self {
         Self {
             writer,
             root: true,
@@ -269,7 +269,7 @@
         Ok(())
     }
 
     fn serialize_some<T: ?Sized>(self, value: &T) -> Result<Self::Ok>
     where
         T: Serialize,
     {
@@ -304,7 +304,7 @@
         Ok(())
     }
 
     fn serialize_newtype_struct<T: ?Sized>(self, name: &'static str, value: &T) -> Result<Self::Ok>
     where
         T: Serialize,
     {
@@ -312,7 +312,7 @@
         value.serialize(self)
     }
 
     fn serialize_newtype_variant<T: ?Sized>(
         self,
         name: &'static str,
         _variant_index: u32,

tests/api.rs

@@ -0,0 +1,58 @@
+pub use rstest::{fixture, rstest};
+use simple_logger::SimpleLogger;
+
+#[fixture]
+fn logger() {
+    let _ = SimpleLogger::new().init();
+}
+
+mod given_custom_event_writer {
+    use super::*;
+    use indoc::indoc;
+    use serde::Serialize;
+    use xml::EmitterConfig;
+
+    #[derive(Debug, Serialize)]
+    struct Document {
+        content: Content,
+    }
+
+    #[derive(Debug, Serialize)]
+    struct Content {
+        text: String,
+    }
+
+    #[fixture]
+    fn document() -> Document {
+        Document {
+            content: Content {
+                text: "content text".into(),
+            },
+        }
+    }
+
+    #[rstest]
+    fn should_accept_custom_event_writer(_logger: (), document: Document) {
+        let mut output = Vec::new();
+        let writer = EmitterConfig::new()
+            .perform_indent(true)
+            .create_writer(&mut output);
+        let mut s = serde_xml_rs::ser::Serializer::new_from_writer(writer);
+
+        document.serialize(&mut s).unwrap();
+        let actual = String::from_utf8(output).unwrap();
+
+        assert_eq!(
+            actual,
+            indoc!(
+                r#"
+            <?xml version="1.0" encoding="UTF-8"?>
+            <Document>
+              <content>
+                <text>content text</text>
+              </content>
+            </Document>"#
+            )
+        );
+    }
+}