humpty/__mocks__/simple-git.js

Makes sure your changelogs mention your breaking changes

let storedCommits;
let storedFiles = {};

function SimpleGitMock(repoPath) {
  this.repoPath = repoPath;

  this.log = (opts, callback) => {
    callback(undefined, { all: storedCommits });
  };

  this.show = ([showRequest], callback) => {
    const [sha, fileName] = showRequest.split(":");
    if (storedFiles[sha] && storedFiles[sha][fileName]) {
      callback(undefined, storedFiles[sha][fileName]);
    } else {
      callback(`Fatal error: could not show ${fileName}`);
    }
  };
}

const simpleGit = function(repoPath) {
  return new SimpleGitMock(repoPath);
};

simpleGit.__setCommits__ = commits =>
  (storedCommits = commits.map(commit => ({ message: commit })));
simpleGit.__setFiles__ = files => (storedFiles = files);

module.exports = simpleGit;