Question

我有一个Grunt插件，我试图编写测试。我试图测试当我尝试对无效的文件类型执行操作时，我的回调中是否收到错误。错误＆＃39;变量返回的toString（）值为：

[Error: No handler for filetype. Unsure what to do with this file: test/input/illegal.file.name

但是当我尝试将其作为字符串进行测试时，我得到了我怀疑的类型错误。

it('should return an error for illegal file names', function(done) {
    grunt.task([
        {
            src : ['test/input/illegal.file.name'],
            dest : '.tmp/ignored.out'
        },
    ], function(err) {
        should.equal(err, "Error: No handler for filetype. Unsure what to do with this file: test/input/illegal.file.name");
    });
});

返回：

AssertionError: expected [Error: No handler for filetype. Unsure what to do with this file: test/input/illegal.file.name] to equal 'Error: No handler for filetype. Unsure what to do with this file: test/input/illegal.file.name'

所以，我试图创建一个新错误并匹配，但无济于事：

it('should return an error for illegal file names', function(done) {
    grunt.task([
        {
            src : ['test/input/illegal.file.name'],
            dest : '.tmp/ignored.out'
        },
    ], function(err) {
        var newError = new Error("No handler for filetype. Unsure what to do with this file: test/input/illegal.file.name");
        should.equal(err, newError);
    });
});

但是这会回来：

AssertionError: expected 
[Error: No handler for filetype. Unsure what to do with this file: test/input/illegal.file.name] to equal 
[Error: No handler for filetype. Unsure what to do with this file: test/input/illegal.file.name]
  + expected - actual

这肯定是平等的，但我显然错过了一些非常基本的东西......

非常感谢任何帮助。

更新

真的很时髦，因为如果我从测试字符串中取出一个空格，我会得到一个非常有效的信息：

it('should return an error for illegal file names', function(done) {
    grunt.task([
        {
            src : ['test/input/illegal.file.name'],
            dest : '.tmp/ignored.out'
        },
    ], function(err) {
        //                           v-- no space
        should.equal(err.message, "Nohandler for filetype: test/input/illegal.file.name");
    });
});

返回：

AssertionError: expected 'No handler for filetype: test/input/illegal.file.name' to equal 'Nohandler for filetype: test/input/illegal.file.name'
  + expected - actual

  +"Nohandler for filetype: test/input/illegal.file.name"
  -"No handler for filetype: test/input/illegal.file.name"

当我把空间放回到＆＃34; No＆＃34;之间时和＆＃34;处理程序＆＃34;，我得到一个非常奇怪的错误：

it('should return an error for illegal file names', function(done) {
    grunt.task([
        {
            src : ['test/input/illegal.file.name'],
            dest : '.tmp/ignored.out'
        },
    ], function(err) {
        should.equal(err.message, "No handler for filetype: test/input/illegal.file.name");
    });
});

返回：

1) should return an error for illegal file names:
 TypeError: Cannot read property 'message' of undefined

Answer 1

具有相同参数的两个对象不相等。尝试这样的事情：

should.equal(err.message, newError.message)

或者只是跳过创建新错误并执行：

should.equal(err.message, "No handler for filetype. Unsure what to do with this file: test/input/illegal.file.name")

此外，您正在运行异步测试，因此请务必在断言后调用done()。

Grunt Plugin - Chai Test Assertion

更新

1 个答案: