feat: set up new test for beat twice

Author: jsjoeio

src/node/heart.ts

@@ -33,7 +33,7 @@ export class Heart {
     if (typeof this.heartbeatTimer !== "undefined") {
       clearTimeout(this.heartbeatTimer)
     }
-    this.heartbeatTimer = setTimeout(() => heartbeatTimer(this.isActive, this.beat), this.heartbeatInterval)
+    this.heartbeatTimer = setTimeout(async () => await heartbeatTimer(this.isActive, this.beat), this.heartbeatInterval)
   }
 
   /**

test/unit/node/heart.test.ts

@@ -23,6 +23,7 @@ describe("Heart", () => {
   })
   afterEach(() => {
     jest.resetAllMocks()
+    jest.useRealTimers()
     if (heart) {
       heart.dispose()
     }
@@ -75,6 +76,17 @@ describe("Heart", () => {
     const isAlive = heart.alive()
     expect(isAlive).toBe(false)
   })
+  it("should beat twice and maintain reference to Heart", async () => {
+    // Use fake timers so we can speed up setTimeout
+    jest.useFakeTimers()
+    heart = new Heart(`${testDir}/hello.txt`, mockIsActive(true))
+    heart.beat()
+    // we need to speed up clocks, timeouts
+    // call heartbeat again (and it won't be alive I think)
+    // then assert no warnings were called
+    jest.runAllTimers()
+    expect(logger.warn).not.toHaveBeenCalled()
+  })
 })
 
 describe("heartbeatTimer", () => {