properly parse xml with no replacements

added a test too

Author: 2bndy5

cpp-linter/src/clang_tools/clang_format.rs

@@ -15,10 +15,10 @@ use crate::{
     common_fs::{get_line_count_from_offset, FileObj},
 };
 
-#[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
+#[derive(Debug, Clone, Deserialize, PartialEq, Eq, Default)]
 pub struct FormatAdvice {
     /// A list of [`Replacement`]s that clang-tidy wants to make.
-    #[serde(rename(deserialize = "replacement"))]
+    #[serde(rename(deserialize = "replacement"), default)]
     pub replacements: Vec<Replacement>,
 
     pub patched: Option<Vec<u8>>,
@@ -198,6 +198,22 @@ mod tests {
         assert!(result.is_err());
     }
 
+    #[test]
+    fn parse_xml_no_replacements() {
+        let xml_raw = r#"<?xml version='1.0'?>
+<replacements xml:space='preserve' incomplete_format='false'>
+</replacements>"#
+            .as_bytes()
+            .to_vec();
+        let expected = FormatAdvice {
+            replacements: vec![],
+            patched: None,
+        };
+        let xml = String::from_utf8(xml_raw).unwrap();
+        let document = quick_xml::de::from_str::<FormatAdvice>(&xml).unwrap();
+        assert_eq!(expected, document);
+    }
+
     #[test]
     fn parse_xml() {
         let xml_raw = r#"<?xml version='1.0'?>