create some tests.

test/main.mjs

@@ -0,0 +1,32 @@
+import * as events from "../export.mjs";
+
+
+
+function assert (bool, error) {
+	if (bool) {
+		console.log("✓");
+	} else {
+		throw new Error(error);
+	}
+}
+function succeeds (fn) {
+	let success = true;
+	try {
+		fn();
+	} catch (error) {
+		success = false;
+	}
+	return success;
+}
+function fails (fn) {
+	return !succeeds(fn);
+}
+
+
+
+events.listen("my_event", data => {
+	assert(data === "meow", `expected string "meow", got ${data}`);
+});
+
+assert(succeeds(_ => events.trigger("my_event", "meow")));
+assert(fails(_ => events.trigger("my_event", "uwu")));