One of my test coverage is as below:

• branch 0%
• function 75%
• lines 81.25%

I see total 3 lines: 16, 27 and 38 under uncovered lines. I confirm that by looking at coverage/Icov-report/index.html (WIP for improving unit test).

Would missing 3 lines of coverage cause branch coverage to be 0%? I would expect something rather than 0% but I am learning Jest so not sure.

• Repository info: TypeScript, Node, Jest

• Code Coverage:

  

• Index.html report

  

service.ts

import { injectable } from 'inversify';
import { createLogger, format, Logger } from 'winston';
import DailyRotateFile from 'winston-daily-rotate-file';
import fs from 'fs';

const logDir = 'logs';

@injectable()
export default class LoggerService {
  private readonly winstonLogger: Logger;

  private static loggerService: LoggerService;

  constructor() {
    if (!fs.existsSync(logDir)) {
      fs.mkdirSync(logDir);
    }

    const dailyRotateFileTransport = new DailyRotateFile({
      filename: `${logDir}/