add test case for m->d too-long message

m2d/converters/event-to-message.test.js

@@ -27,3 +27,31 @@ test("event2message: janky test", t => {
 		}]
 	)
 })
+
+test("event2message: long messages are split", t => {
+	t.deepEqual(
+		eventToMessage({
+			content: {
+				body: ("a".repeat(130) + " ").repeat(19),
+				msgtype: "m.text"
+			},
+			event_id: "$g07oYSZFWBkxohNEfywldwgcWj1hbhDzQ1sBAKvqOOU",
+			origin_server_ts: 1688301929913,
+			room_id: "!kLRqKKUQXcibIMtOpl:cadence.moe",
+			sender: "@cadence:cadence.moe",
+			type: "m.room.message",
+			unsigned: {
+				age: 405299
+			}
+		}),
+		[{
+			username: "cadence",
+			content: (("a".repeat(130) + " ").repeat(15)).slice(0, -1),
+			avatar_url: undefined
+		}, {
+			username: "cadence",
+			content: (("a".repeat(130) + " ").repeat(4)).slice(0, -1),
+			avatar_url: undefined
+		}]
+	)
+})