test.ts

it("should handle a basic source that emits next then errors, count=3", () => {
    testScheduler.run(({ expectObservable, cold, expectSubscriptions }) => {
      const source = cold("--1-2-3-#");
      const subs = [      "^       !                ",
                          "        ^        !        ",
                          "                 ^         !"
      ];
      const expected =   "--1-2-3----1-2-3-----1-2-3-#";

      expectObservable(
        source.pipe(retryBackoff({ initialInterval: 1, maxAttempts: 3 }))
      ).toBe(expected);
      expectSubscriptions(source.subscriptions).toBe(subs);
    });
  });
  
  // FAILS with
  AssertionError: expected [ Array(3) ] to deeply equal [ Array(3) ]
      + expected - actual

       [
         {
           "subscribedFrame": 0
      -    "unsubscribedFrame": 8
      +    "unsubscribedFrame": 1
         }
         {
      -    "subscribedFrame": 9
      -    "unsubscribedFrame": 17
      +    "subscribedFrame": 0
      +    "unsubscribedFrame": 1
         }
         {
      -    "subscribedFrame": 19
      -    "unsubscribedFrame": 27
      +    "subscribedFrame": 0
      +    "unsubscribedFrame": 1
         }
       ]