tests.js

const outerFunc = () => {
  var i = 0 
  return new Promise(resolve => {
    if (i < 3) {
      i++
      const innerFunc = () => {
      	return new Promise(resolve => {
      	  return log.asyncCall().then(log => {
      	    if (log) {
              // some logic
      	    } else {
              resolve()
      	    }
      	  }).then(() => {
      	    // continue iterating innerFunc()
      	    return innerFunc();
      	  });
      	})
      };
      // first iteration innerFunc()
      return innerFunc().then(() => {
      	// once innerFunc() is complete, reiterate outerFunc()
      	return outerFunc();
      });
    } else {
      resolve();
    }
  });  
}