feat: add tests for node/heart.ts

Author: Joe Previte

src/node/heart.ts

@@ -27,21 +27,21 @@ export class Heart {
 
     logger.trace("heartbeat")
     fs.writeFile(this.heartbeatPath, "").catch((error) => {
-      logger.warn(error.message)
+      logger.warn(error.message) // TODO@jsjoeio - write code for this line
     })
     this.lastHeartbeat = Date.now()
     if (typeof this.heartbeatTimer !== "undefined") {
-      clearTimeout(this.heartbeatTimer)
+      clearTimeout(this.heartbeatTimer) // TODO@jsjoeio - write code for this line
     }
     this.heartbeatTimer = setTimeout(() => {
-      this.isActive()
+      this.isActive() // TODO@jsjoeio - start write code for here.
         .then((active) => {
           if (active) {
             this.beat()
           }
         })
         .catch((error) => {
-          logger.warn(error.message)
+          logger.warn(error.message) // TODO@jsjoeio - end.
         })
     }, this.heartbeatInterval)
   }