TypeError: expect (...). To.be non è una funzione

Question

Sto configurando il mio framework karma amd mocha con grunt nel mio progetto. Quando sto eseguendo karma start, sto ricevendo un errore sotto menzionato.

sto ottenendo questo errore nel mio console durante l'esecuzione dei comandi: Karma start

TypeError: expect(...).to.be is not a function 

mio Karma.confjs

// Karma configuration 
// Generated on Fri Nov 27 2015 11:48:47 GMT+0530 (India Standard Time) 

module.exports = function(config) { 
    config.set({ 

    // base path that will be used to resolve all patterns (eg. files, exclude) 
    basePath: '', 


    // frameworks to use 
    // available frameworks: https://npmjs.org/browse/keyword/karma-adapter 
    frameworks: ['mocha', 'chai'], 


    // list of files/patterns to load in the browser 
    files: [ 
     'bower_components/angular/angular.js', 
     'bower_components/angular-mocks/angular-mocks.js', 
     'app/*.js', 
     // 'test/specs/*.js', 
     'test/specs/array.js', 
     // 'test/specs/myCtlr-spec.js', 
     //'test/*.js' 
    ], 


    // list of files to exclude 
    exclude: [ 
    ], 


    // preprocess matching files before serving them to the browser 
    // available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor 
    preprocessors: { 
    }, 


    // test results reporter to use 
    // possible values: 'dots', 'progress' 
    // available reporters: https://npmjs.org/browse/keyword/karma-reporter 
    reporters: ['progress','coverage'], 

    preprocessors: { 
     'src/app/**/*.js': ['coverage'] 
    }, 
    coverageReporter: { 
     type: 'lcov', 
     dir: 'coverage/' 
    }, 

    // web server port 
    port: 9876, 


    // enable/disable colors in the output (reporters and logs) 
    colors: true, 


    // level of logging 
    // possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG 
    logLevel: config.LOG_INFO, 


    // enable/disable watching file and executing tests whenever any file changes 
    autoWatch: true, 


    // start these browsers 
    // available browser launchers: https://npmjs.org/browse/keyword/karma-launcher 
    // browsers: ['PhantomJS', 'Chrome'], 
    browsers: ['Chrome'], 


    // Continuous Integration mode 
    // if true, Karma captures browsers, runs the tests and exits 
    singleRun: false, 

    // Concurrency level 
    // how many browser should be started simultanous 
    concurrency: Infinity 
    }) 
} 

mio array.js prova

// var expect = require('chai').expect; 

describe("Mocha: The 'toBe' matcher compares with ===", function() { 
    it("and has a positive case", function() { 
    expect(true).to.be(true); 
    }); 

    it("and can have a negative case", function() { 
    expect(false).not.to.be(true); 
    }); 
}); 

Si prega di suggerire cosa mi manca.

Answer 1

È necessario scrivere expect(true).to.be.equal(true) l'essere è una catena (oggetto) non una funzione. Oppure si potrebbe scrivere:

expect(true).to.be.true; 
expect(false).to.be.false;