不能为 QUnit 使用参数化插件

Cannot use parametrize plugin for QUnit

不能运行一个简单的参数化测试:

qunit.cases([{a: 1, b: 2}]).test("my test", function (params, assert) {
    var sum = params.a + params.b;

    assert.equal(3, sum, "correct");
});

说回调函数为空,其实不是

根据 parameterize.js 文档:parameterize plugin for qunit

我应该这样做:

QUnit
.cases(testCasesList)
.test(title, [expect], callback);

我检查了代码,如果 expect 为 null,则第二个它被初始化为回调函数。我什至尝试将 expect = 3 和回调作为第三个参数,但它仍然给出相同的错误,回调函数为空。

我可能做错了什么?

期望参数是什么,一个函数一个数字?

我想这个工具是为以前版本的 QUnit 制作的。我进行了一些调试并找到了解决方案:

/*
 * Parameterize v 0.4
 * A QUnit Addon For Running Parameterized Tests
 * https://github.com/AStepaniuk/qunit-parameterize
 * Released under the MIT license.
 */
QUnit.extend(QUnit, {
    cases: (function() {
    'use strict';
    var currentCases = null,
        clone = function(testCase) {
            var result = {},
                p = null;

            for (p in testCase) {
                if (testCase.hasOwnProperty(p)) {
                    result[p] = testCase[p];
                }
            }

            return result;
        },
        createTest = function(methodName, title, expected, callback, parameters) {

            QUnit[methodName](title + ", test params: " + JSON.stringify(parameters), function(assert) {
                return callback.call(this, parameters, assert);
            });
        },

        iterateTestCases = function(methodName, title, expected, callback) {
            var i = 0,
                parameters = null,
                testCaseTitle = null;

            if (!currentCases || currentCases.length === 0) {
                // setup test which will always fail
                QUnit.test(title, function(assert) {
                    assert.ok(false, "No test cases are provided");
                });
                return;
            }

            if (!callback) {
                callback = expected;
                expected = null;
            }

            for (i = 0; i < currentCases.length; i += 1) {
                parameters = currentCases[i];

                testCaseTitle = title;
                if (parameters.title) {
                    testCaseTitle += "[" + parameters.title + "]";
                }

                createTest(methodName, testCaseTitle, expected, callback, parameters);
            }
        },

        getLength = function(arr) {
            return arr ? arr.length : 0;
        },

        getItem = function(arr, idx) {
            return arr ? arr[idx] : undefined;
        },

        mix = function(testCase, mixData) {
            var result = null,
                p = null;

            if (testCase && mixData) {
                result = clone(testCase);

                for (p in mixData) {
                    if (mixData.hasOwnProperty(p)) {
                        if (p !== "title") {
                            if (!(result.hasOwnProperty(p))) {
                                result[p] = mixData[p];
                            }
                        } else {
                            result[p] = [result[p], mixData[p]].join("");
                        }
                    }
                }

            } else if (testCase) {
                result = testCase;
            } else if (mixData) {
                result = mixData;
            } else {
                // return null or undefined whatever testCase is
                result = testCase;
            }

            return result;
        };

    return {

        init: function(testCasesList) {
            currentCases = testCasesList;
            return this;
        },

        sequential: function(addData) {
            var casesLength = getLength(currentCases),
                addDataLength = getLength(addData),
                length = casesLength > addDataLength ? casesLength : addDataLength,
                newCases = [],
                i = 0,
                currentCaseI = null,
                dataI = null,
                newCase = null;

            for (i = 0; i < length; i += 1) {
                currentCaseI = getItem(currentCases, i);
                dataI = getItem(addData, i);
                newCase = mix(currentCaseI, dataI);

                if (newCase) {
                    newCases.push(newCase);
                }
            }

            currentCases = newCases;

            return this;
        },

        combinatorial: function(mixData) {
            var current = (currentCases && currentCases.length > 0) ? currentCases : [null],
                currentLength = current.length,
                mixDataLength = 0,
                newCases = [],
                i = 0,
                j = 0,
                currentCaseI = null,
                dataJ = null,
                newCase = null;

            mixData = (mixData && mixData.length > 0) ? mixData : [null];
            mixDataLength = mixData.length;

            for (i = 0; i < currentLength; i += 1) {
                for (j = 0; j < mixDataLength; j += 1) {
                    currentCaseI = current[i];
                    dataJ = mixData[j];
                    newCase = mix(currentCaseI, dataJ);

                    if (newCase) {
                        newCases.push(newCase);
                    }
                }
            }

            currentCases = newCases;

            return this;
        },

        test: function(title, expected, callback) {
            iterateTestCases("test", title, expected, callback);
            return this;
        },

        getCurrentTestCases: function () {
            return currentCases;
        }
    };
    }())
});

首先,我猜作者想用 4 个附加功能扩展 QUnit:

sequential(addData);
combinatorial(mixData);
test(title, expected, callback);
asyncTest(title, expected, callback);

但未能如愿。我所做的是,我将 "cases" 转换为对象而不是函数,并添加了 init() 函数,该函数在内部初始化测试用例数组。

我还将 createTest() 函数更改为:

createTest = function(methodName, title, expected, callback, parameters) {
    QUnit[methodName](title + ", test params: " + JSON.stringify(parameters), function(assert) {
        return callback.call(this, parameters, assert);
    });
}

直接调用QUnit.test(title, callback)而不传递"expected"参数。不确定此 "expected" 参数的用途,但您可以在测试用例数组中添加自己的参数,并且仍然涵盖预期的内容。

这是我如何创建 3 个参数化测试的示例:

QUnit.cases
        .init([{a: 1, b: 2, expected: 3}, {a: 4, b: 5, expected: 9}, {a: -5, b: 5, expected: 0}])
        .test("test sum(a, b)", function (parameters, assert) {
            var sum = parameters.a + parameters.b;

            assert.equal(sum, parameters.expected, "expected: " + parameters.expected + ", calculated: " + sum);
        });

当前脚本涵盖了顺序测试,但我还是保留了这个功能:

qunit
    .cases
    .init([
        {param1: 50},
        {param1: 200},
        {param1: 300}
    ])
    .sequential([
        {param2: 100},
        null,
        {param2: 150}
    ])
    .test("Meta tests for QUnit Parametrize plugin", function (params, assert) {
        console.dir(params);
        assert.equal(params.param1, params.param2,"");
    });

您还可以创建组合测试,这会在 init() 和 combinatorial() 参数段中创建测试组合

qunit
    .cases
    .init([
        {param1: 50}
    ])
    .combinatorial([
        {param2: 100},
        {param2: 150},
        {param2: 50}
    ])
    .test("Meta tests for QUnit Parametrize plugin", function (params, assert) {
        assert.equal(params.param1, params.param2,"");
    });
最新版本不支持

QUnit.async()。你应该使用 QUnit.test() 也用于异步测试。咨询:qunit 2.x upgrade 我从 QUnit Parameteize 中删除了异步。 感谢阅读:)