1 files changed, 29 insertions, 0 deletions
diff --git a/vendor/handlebars/tests/data_helper.rs b/vendor/handlebars/tests/data_helper.rs
new file mode 100644
index 000000000..7734b0d7a
--- /dev/null
+++ b/vendor/handlebars/tests/data_helper.rs
@@ -0,0 +1,29 @@
+use handlebars::*;
+use serde_json::json;
+
+struct HelperWithBorrowedData<'a>(&'a String);
+
+impl<'a> HelperDef for HelperWithBorrowedData<'a> {
+    fn call<'_reg: '_rc, '_rc>(
+        &self,
+        _: &Helper<'_reg, '_rc>,
+        _: &'_reg Handlebars,
+        _: &Context,
+        _: &mut RenderContext,
+        out: &mut dyn Output,
+    ) -> Result<(), RenderError> {
+        out.write(self.0).map_err(RenderError::from)
+    }
+}
+
+#[test]
+fn test_helper_with_ref_data() {
+    let s = "hello helper".to_owned();
+    let the_helper = HelperWithBorrowedData(&s);
+
+    let mut r = Handlebars::new();
+    r.register_helper("hello", Box::new(the_helper));
+
+    let s = r.render_template("Output: {{hello}}", &json!({})).unwrap();
+    assert_eq!(s, "Output: hello helper".to_owned());
+}