unit tests for RefCell extractors

crates/neon/src/types_impl/extract/container.rs

@@ -22,7 +22,7 @@ impl<T> Container for RefCell<T> {
     }
 }
 
-impl<'cx, T: Container + 'static> TryFromJs<'cx> for &'cx RefCell<T> {
+impl<'cx, T: 'static> TryFromJs<'cx> for &'cx RefCell<T> {
     type Error = RustTypeExpected<RefCell<T>>;
 
     fn try_from_js(

test/napi/lib/container.js

@@ -0,0 +1,17 @@
+const addon = require("..");
+const { expect } = require("chai");
+const assert = require("chai").assert;
+
+describe("container", function () {
+  it("can produce and consume a RefCell", function () {
+    const cell = addon.createStringRefCell("my sekret mesij");
+    const s = addon.readStringRefCell(cell);
+    assert.strictEqual("my sekret mesij", s);
+  });
+
+  it("concatenates a RefCell<String> with a String", function () {
+    const cell = addon.createStringRefCell("hello");
+    const s = addon.stringRefCellConcat(cell, " world");
+    assert.strictEqual("hello world", s);
+  });
+});

test/napi/src/js/container.rs

@@ -0,0 +1,16 @@
+use std::cell::RefCell;
+
+#[neon::export]
+fn create_string_ref_cell(s: String) -> RefCell<String> {
+    RefCell::new(s)
+}
+
+#[neon::export]
+fn read_string_ref_cell(s: &RefCell<String>) -> String {
+    s.borrow().clone()
+}
+
+#[neon::export]
+fn string_ref_cell_concat(lhs: &RefCell<String>, rhs: String) -> String {
+    lhs.borrow().clone() + &rhs
+}

test/napi/src/lib.rs

@@ -12,6 +12,7 @@ mod js {
     pub mod bigint;
     pub mod boxed;
     pub mod coercions;
+    pub mod container;
     pub mod date;
     pub mod errors;
     pub mod export;