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docs/snippets/elixir/plugins/plugin_testing.md

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+<!-- snippet:skip reason="Elixir Rustler NIFs cannot host async Send + Sync + 'static Rust trait objects via callbacks; the BEAM actor-model boundary requires plugin work to live in the Rust core. The alef-generated Elixir trait_call macro additionally has a backslash/encoding bug (separate alef-codegen ticket). Custom plugins must be implemented in Rust." -->
+Plugin testing in Elixir is limited since custom plugins cannot be implemented in Elixir. Plugin testing should be done in Rust using `#[cfg(test)]` test modules.
+
+When testing custom plugins in Rust:
+
+```rust
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[tokio::test]
+    async fn test_custom_extractor() {
+        let extractor = MyExtractor;
+        let content = b"test content";
+        let result = extractor.extract_bytes(content, "text/plain", &ExtractionConfig::default()).await;
+        assert!(result.is_ok());
+    }
+}
+```
+
+For Elixir, you can test the extraction results using the built-in functions like `Kreuzberg.extract_bytes_async/3` and `Kreuzberg.extract_file_async/3`.