变体1

Question

我尝试了解如何测试js文件。看，我有一个带有功能的emotify.js文件：

function emotify(string) {
 return string + '' + ' :)'; 
}

然后我创建了另一个文件-index.js，内容如下：

var emotify = require('./emotify.js');
console.log(emotify('just testing'));

但是控制台向我推送了一个错误

 TypeError: emotify is not a function

怎么了？

Answer 1

当您需要一个模块时，结果就是该模块已导出的内容。在这种情况下，您将需要导出函数：

emotify.js代码：

#include <algorithm>
#include <initializer_list>
#include <iostream>
#include <cassert>
#include <ostream>
#include "Vector.h"


int main() {

    ///////////////////////////////////////////////////////////////////////
    ///////////////////////////// VECTOR //////////////////////////////////
    ///////////////////////////////////////////////////////////////////////
    Vector<int> nullVector;                        // Declare an empty Vector
    assert(nullVector.getSize() == 0);                 // Make sure its size is 0
    assert(nullVector.empty());                    // Make sure the vector is empty
    assert(nullVector.getCapacity() == 100);          // Make sure its capacity is greater than 0

    Vector<int> source(20, 0);                      // Declare a 20-element zero Vector
    assert(source.getSize() == 20);                 // Make sure its size is 20
    for (int i = 0; i < source.getSize(); i++) {
        source.set(i, i);
        assert(source.get(i) == i);                 // Make sure the i-th element has value i
    }



    source.remove(15);                              // Remove the 15th element
    assert(source[15] == 16);                       // Make sure the 15th element has value 16
    source.insert(15, 15);                          // Insert value 15 at the index 15
    assert(source[15] == 15);                       // Make sure the 15th element has value 15

    source.pop_back();                              // Remove the last element
    assert(source.getSize() == 19);                 // Make sure its size is 19
    source.push_back(19);                           // Insert value 20 at the bottom
    assert(source.getSize() == 20);                 // Make sure its size is 20
    assert(source.get(19) == 19);                   // Make sure the 19th element has value 19

    Vector<int> copyVector(source);                 // Declare a Vector equal to source
    for (int i = 0; i < source.getSize(); i++) {
        assert(copyVector[i] == source[i]);         // Make sure copyVector equal to source
    }

    // Vector<int> newSource = copyVector + source;
    std::cout << "source: \n" << source;             // Print out source
    std::cout << "copyVector: \n" << copyVector;    // Print out copyVector
    Vector<int> newSource = source + copyVector;    //  Concatenate source and copyVector
    std::cout << "newSource: \n" << newSource;      // Print out source + copyVector

    source.clear();                                 // Clear source
    assert(source.getSize() == 0);                  // Make sure its size is 0

    std::cout << "Vector unit test succeeded." << std::endl;



    return 0;
}

Answer 2

变体1

emotify.js：

module.exports = function emotify(string) { // Named function, good for call stack at debugging. You are pro, right ?
 return string + '' + ' :)'; 
}

test.js：

const emotify = require('./emotify.js'); // const instead of var, cause you are pro :)
console.log(emotify('just testing'));

变种2

mylib.js：

function emotify(string) {
 return string + '' + ' :)'; 
}

function anotherFunc(string) {
 return string + '' + ' :)'; 
}

module.exports = {
 emotify,
 anotherFunc,
};

test.js：

const mylib = require('./mylib.js');

console.log(mylib.emotify('just testing'));
console.log(mylib.anotherFunc('just testing'));

================

有用的链接：

使用nodejs测试js文件

2 个答案:

变体1

变种2