grunt-githooks/test/githooks_test.js

'use strict';

var fs = require('fs'),
    path = require('path'),
    exec = require('child_process').exec,
    grunt = require('grunt');

// Load grunt configuration
require('../Gruntfile.js');

// Cache path to the directory hosting the Gruntfile
// As tests are run via Grunt, this will be the current working directory
var gruntfileDirectory = process.cwd();

function getHookPath(testID, hookName) {
  return 'tmp/' + testID + '/' + (hookName || 'pre-commit');
}

// Paths will have their backslashes escaped, except for the `shellScript` test
function escapedPath(path, testID) {

  if (testID !== 'shellScript') {
    return path.replace(/\\/g,'\\\\');
  }

  return path;
}

function testHookContent(hookPath, testID, test, hookName) {
  var expected = grunt.file.read('test/expected/' + (hookName || 'pre-commit') + '.' + testID);
  expected = expected.replace('{{expectedWorkingDir}}', escapedPath(gruntfileDirectory, testID)); // Paths should have backslashes escaped
  var actual = grunt.file.read(hookPath);
  
  // Ignore line endings
  test.equal(actual.replace(/[\n,\r]/g,''), expected.replace(/[\n,\r]/g,''), 'Should create hook with appropriate content');
}

function addTest(testSuite, testID) {

  testSuite[testID] = function (test) {

    test.expect(1);
    var hookPath = getHookPath(testID);

    testHookContent(hookPath, testID, test);

    test.done();
  };
}

exports.githooks = {
  'test.multipleHooks--commit-msg': function (test) {

    test.expect(1);

    var hookPath = getHookPath('multipleHooks','commit-msg');
    testHookContent(hookPath,'multipleHooks', test, 'commit-msg');

    test.done();
  }
};

if (process.platform !== 'win32') {
  // Due to task logs not appearing in stdout on Windows
  // and trouble executing the generated hook with `exec`
  // These tests are ignored on Windows and should be checked manually :(
  exports.githooks['generatedHookExecution'] =  function (test) {

    test.expect(1);
    exec(path.resolve(getHookPath('default')), function (err, stdout) {

      test.notEqual(stdout.indexOf('Boom! Running a task!'), -1);
      test.done();
    });
  };

  exports.githooks['logs.defaultLogging'] =  function (test) {

    test.expect(1);
    exec('grunt githooks:logs.defaultLogging', function(err, stdout) {

      test.notEqual(stdout.indexOf('Binding `aTask` to `pre-commit` Git hook'), -1);
      test.done();
    });  
  };

  exports.githooks['logs.warnIfNotValidHook'] =  function (test) {
      
    test.expect(1);
    exec('grunt githooks:logs.warnIfNotValidHook', function(err, stdout){

      test.notEqual(stdout.indexOf('`definitelyNotTheNameOfAGitHook` is not the name of a Git hook.'), -1);
      test.done();
    });  
  };

  exports.githooks['fails.invalidScriptingLanguage'] =  function (test) {

    test.expect(3);
    exec('grunt githooks:fails.invalidScriptingLanguage', function(err, stdout, stderr){

      test.ok(!!err);
      test.notEqual(stdout.indexOf("doesn't seem to be written in the same language"), -1);
      testHookContent(getHookPath('invalidScriptingLanguage'), 'invalidScriptingLanguage', test);
      test.done();
    });
  };

  exports.githooks['fails.customHashbangInvalidScriptingLanguage'] =  function (test) {

    test.expect(3);
    exec('grunt githooks:fails.customHashbangInvalidScriptingLanguage', function(err, stdout, stderr){

      test.ok(!!err);
      test.notEqual(stdout.indexOf("doesn't seem to be written in the same language"), -1);
      testHookContent(getHookPath('customHashbangInvalidScriptingLanguage'), 'customHashbangInvalidScriptingLanguage', test);
      test.done();
    });
  };
}

/* Most of the testing is done by matching files generated by the `grunt githooks` calls 
 * to expected files stored in the `test/expected` folder of the project. 
 * Use the following naming conventions:
 *  - name the test tasks `test.<testID>`
 *  - name expected hook `pre-commit.<testID>`
 *  - set `dest` option of your task to `tmp/<testId>`
 */
for (var target in grunt.config.data.githooks) {
  
  var TEST_TARGET = /^test.(.*)$/;
  var match = TEST_TARGET.exec(target);
  if (match) {
    addTest(exports.githooks, match[1]);
  }
}