Javascript 类型错误：expect(...).to.be 不是函数
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TypeError: expect(...).to.be is not a function
提问by Javascript Coder
I am configuring my Karma amd mocha framework with grunt in my project. When I am running karma start I am getting below-mentioned error.
我正在我的项目中使用 grunt 配置我的 Karma amd mocha 框架。当我运行 karma start 时，出现以下错误。
I am getting this error in my console while running command : Karma start
运行命令时，我在控制台中收到此错误： Karma start
TypeError: expect(...).to.be is not a function
My Karma.confjs
我的 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
})
}
My array.js test
我的 array.js 测试
// 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);
});
});
Please suggest what I am missing.
请建议我缺少什么。
回答by Raulucco
You need to write expect(true).to.be.equal(true)the be is a chain (object) not a function. Or you could write:
您需要编写expect(true).to.be.equal(true)be 是一个链（对象）而不是一个函数。或者你可以写：
expect(true).to.be.true;
expect(false).to.be.false;
