precompiler.js

/*eslint-disable no-console */
describe('precompiler', function() {
  // NOP Under non-node environments
  if (typeof process === 'undefined') {
    return;
  }

  var Handlebars = require('../lib'),
      Precompiler = require('../dist/cjs/precompiler'),
      fs = require('fs'),
      uglify = require('uglify-js');

  var log,
      logFunction,

      precompile,
      minify,

      emptyTemplate = {
        path: __dirname + '/artifacts/empty.handlebars',
        name: 'empty',
        source: ''
      },

      file,
      content,
      writeFileSync;

  beforeEach(function() {
    precompile = Handlebars.precompile;
    minify = uglify.minify;
    writeFileSync = fs.writeFileSync;

    logFunction = console.log;
    log = '';
    console.log = function() {
      log += Array.prototype.join.call(arguments, '');
    };
    fs.writeFileSync = function(_file, _content) {
      file = _file;
      content = _content;
    };
  });
  afterEach(function() {
    Handlebars.precompile = precompile;
    uglify.minify = minify;
    fs.writeFileSync = writeFileSync;
    console.log = logFunction;
  });

  it('should output version', function() {
    Precompiler.cli({templates: [], version: true});
    equals(log, Handlebars.VERSION);
  });
  it('should throw if lacking templates', function() {
    shouldThrow(function() {
      Precompiler.cli({templates: []});
    }, Handlebars.Exception, 'Must define at least one template or directory.');
  });
  it('should handle empty/filtered directories', function() {
    Precompiler.cli({hasDirectory: true, templates: []});
    // Success is not throwing
  });
  it('should throw when combining simple and minimized', function() {
    shouldThrow(function() {
      Precompiler.cli({templates: [__dirname], simple: true, min: true});
    }, Handlebars.Exception, 'Unable to minimize simple output');
  });
  it('should throw when combining simple and multiple templates', function() {
    shouldThrow(function() {
      Precompiler.cli({templates: [__dirname + '/artifacts/empty.handlebars', __dirname + '/artifacts/empty.handlebars'], simple: true});
    }, Handlebars.Exception, 'Unable to output multiple templates in simple mode');
  });
  it('should throw when combining simple and directories', function() {
    shouldThrow(function() {
      Precompiler.cli({hasDirectory: true, templates: [1], simple: true});
    }, Handlebars.Exception, 'Unable to output multiple templates in simple mode');
  });

  it('should output simple templates', function() {
    Handlebars.precompile = function() { return 'simple'; };
    Precompiler.cli({templates: [emptyTemplate], simple: true});
    equal(log, 'simple\n');
  });
  it('should output amd templates', function() {
    Handlebars.precompile = function() { return 'amd'; };
    Precompiler.cli({templates: [emptyTemplate], amd: true});
    equal(/template\(amd\)/.test(log), true);
  });
  it('should output multiple amd', function() {
    Handlebars.precompile = function() { return 'amd'; };
    Precompiler.cli({templates: [emptyTemplate, emptyTemplate], amd: true, namespace: 'foo'});
    equal(/templates = foo = foo \|\|/.test(log), true);
    equal(/return templates/.test(log), true);
    equal(/template\(amd\)/.test(log), true);
  });
  it('should output amd partials', function() {
    Handlebars.precompile = function() { return 'amd'; };
    Precompiler.cli({templates: [emptyTemplate], amd: true, partial: true});
    equal(/return Handlebars\.partials\['empty'\]/.test(log), true);
    equal(/template\(amd\)/.test(log), true);
  });
  it('should output multiple amd partials', function() {
    Handlebars.precompile = function() { return 'amd'; };
    Precompiler.cli({templates: [emptyTemplate, emptyTemplate], amd: true, partial: true});
    equal(/return Handlebars\.partials\[/.test(log), false);
    equal(/template\(amd\)/.test(log), true);
  });
  it('should output commonjs templates', function() {
    Handlebars.precompile = function() { return 'commonjs'; };
    Precompiler.cli({templates: [emptyTemplate], commonjs: true});
    equal(/template\(commonjs\)/.test(log), true);
  });

  it('should set data flag', function() {
    Handlebars.precompile = function(data, options) { equal(options.data, true); return 'simple'; };
    Precompiler.cli({templates: [emptyTemplate], simple: true, data: true});
    equal(log, 'simple\n');
  });

  it('should set known helpers', function() {
    Handlebars.precompile = function(data, options) { equal(options.knownHelpers.foo, true); return 'simple'; };
    Precompiler.cli({templates: [emptyTemplate], simple: true, known: 'foo'});
    equal(log, 'simple\n');
  });
  it('should output to file system', function() {
    Handlebars.precompile = function() { return 'simple'; };
    Precompiler.cli({templates: [emptyTemplate], simple: true, output: 'file!'});
    equal(file, 'file!');
    equal(content, 'simple\n');
    equal(log, '');
  });

  it('should output minimized templates', function() {
    Handlebars.precompile = function() { return 'amd'; };
    uglify.minify = function() { return {code: 'min'}; };
    Precompiler.cli({templates: [emptyTemplate], min: true});
    equal(log, 'min');
  });

  it('should output map', function() {
    Precompiler.cli({templates: [emptyTemplate], map: 'foo.js.map'});

    equal(file, 'foo.js.map');
    equal(/sourceMappingURL=/.test(log), true);
  });

  it('should output map', function() {
    Precompiler.cli({templates: [emptyTemplate], min: true, map: 'foo.js.map'});

    equal(file, 'foo.js.map');
    equal(/sourceMappingURL=/.test(log), true);
  });

  describe('#loadTemplates', function() {
    it('should throw on missing template', function(done) {
      Precompiler.loadTemplates({files: ['foo']}, function(err) {
        equal(err.message, 'Unable to open template file "foo"');
        done();
      });
    });
    it('should enumerate directories by extension', function(done) {
      Precompiler.loadTemplates({files: [__dirname + '/artifacts'], extension: 'hbs'}, function(err, opts) {
        equal(opts.templates.length, 1);
        equal(opts.templates[0].name, 'example_2');
        done(err);
      });
    });
    it('should enumerate all templates by extension', function(done) {
      Precompiler.loadTemplates({files: [__dirname + '/artifacts'], extension: 'handlebars'}, function(err, opts) {
        equal(opts.templates.length, 3);
        equal(opts.templates[0].name, 'bom');
        equal(opts.templates[1].name, 'empty');
        equal(opts.templates[2].name, 'example_1');
        done(err);
      });
    });
    it('should handle regular expression characters in extensions', function(done) {
      Precompiler.loadTemplates({files: [__dirname + '/artifacts'], extension: 'hb(s'}, function(err) {
        // Success is not throwing
        done(err);
      });
    });
    it('should handle BOM', function(done) {
      var opts = {files: [__dirname + '/artifacts/bom.handlebars'], extension: 'handlebars', bom: true};
      Precompiler.loadTemplates(opts, function(err, opts) {
        equal(opts.templates[0].source, 'a');
        done(err);
      });
    });

    it('should handle different root', function(done) {
      var opts = {files: [__dirname + '/artifacts/empty.handlebars'], simple: true, root: 'foo/'};
      Precompiler.loadTemplates(opts, function(err, opts) {
        equal(opts.templates[0].name, __dirname + '/artifacts/empty');
        done(err);
      });
    });

    it('should complete when no args are passed', function(done) {
      Precompiler.loadTemplates({}, function(err, opts) {
        equal(opts.templates.length, 0);
        done(err);
      });
    });
  });
});