chore: event filtering test

Author: dpc

tests/filters.rs

@@ -0,0 +1,45 @@
+use jotdown::{Container, Event, Render, RenderExt as _};
+use std::borrow::Cow;
+
+struct RickrollRenderer<R>(R);
+
+impl<'s, R> Render<'s> for RickrollRenderer<R>
+where
+    R: Render<'s>,
+{
+    type Error = R::Error;
+
+    fn begin(&mut self) -> Result<(), Self::Error> {
+        self.0.begin()
+    }
+
+    fn emit(&mut self, event: Event<'s>) -> Result<(), Self::Error> {
+        match event {
+            Event::Start(Container::Link(_link, t), attrs) => self.0.emit(Event::Start(
+                Container::Link(
+                    Cow::Owned("https://www.youtube.com/watch?v=E4WlUXrJgy4".to_owned()),
+                    t,
+                ),
+                attrs,
+            )),
+            _ => self.0.emit(event),
+        }
+    }
+
+    fn finish(&mut self) -> Result<(), Self::Error> {
+        self.0.finish()
+    }
+}
+
+#[test]
+fn rickroll_me() {
+    let src = "[interesting link](https://example.com)";
+    let mut r = RickrollRenderer(jotdown::html::Renderer::minified());
+
+    r.render_document(src).unwrap();
+
+    assert_eq!(
+        r.0.into_inner(),
+        "<p><a href=\"https://www.youtube.com/watch?v=E4WlUXrJgy4\">interesting link</a></p>"
+    );
+}

tests/lib.rs

@@ -1,3 +1,4 @@
 mod attr;
 mod html;
+mod filters;
 mod parse_events;