feat: add tests

README.md

@@ -32,7 +32,8 @@ Options:
       --chrono-dates     Use chrono::NaiveDateTime for date/timestamps logical types
       --derive-builders  Derive builders for generated record structs
       --derive-schemas   Derive AvroSchema for generated record structs
-      --extra_derives    Append extra derive macros to the generated record structs
+      --extra_derive    Append one extra derive macros to the generated record structs
+      --extra_derives    Append extra derive macros list to the generated record structs
   -h, --help             Print help
   -V, --version          Print version
 ```

src/gen.rs

@@ -361,6 +361,14 @@ impl GeneratorBuilder {
         self
     }
 
+    /// Adds support to derive custom macros.
+    ///
+    /// Applies to record structs.
+    pub fn extra_derive(mut self, extra_derive: &str) -> GeneratorBuilder {
+        self.extra_derives.push(extra_derive.to_string());
+        self
+    }
+
     /// Create a [`Generator`](Generator) with the builder parameters.
     pub fn build(self) -> Result<Generator> {
         let mut templater = Templater::new()?;

tests/generation.rs

@@ -236,7 +236,7 @@ fn gen_one_extra_derives() {
     validate_generation(
         "one_extra_derive",
         Generator::builder()
-            .extra_derives(vec!["std::fmt::Display".to_string()])
+            .extra_derive("std::fmt::Display")
             .build()
             .unwrap(),
     );