Another case.

Author: microbit-matt-hillsdon

src/board/data-logging.test.ts

@@ -216,6 +216,8 @@ describe("DataLogging", () => {
 
     logging.delete();
 
+    expect(log).toEqual([]);
+
     serial.length = 0;
     logging.beginRow();
     logging.logData("b", "2");