測試承諾和同步功能，拋出錯誤

Question

我想在同一時間建立和測試一個功能。測試是有道理的，我理論上喜歡它，但是當它歸結於它時，它總是背後的痛苦。

我有一個函數，將一個字符串時的東西都被打亂拋出錯誤，如果一切順利的話這將返回原來的text論證，因此一個truthy值，如果不應該由它無論是在或承諾被抓本身就是承諾。

這是測試/我真正想要做什麼（哪個不行）。

var main = require("./index.js") 
var Promise = require("bluebird") 
var mocha = require("mocha") 
var chai = require("chai") 
var chaiPromise = require("chai-as-promised") 
chai.use(chaiPromise) 

var shouldThrow = [ 
    "random", // invalid non-flag 
    "--random", // invalid flag 
    "--random string", //invalid flag 
    "--wallpaper", // invalid flag w/ match 
    "--notify", // invalid flag w/ match 
    "wallpaper", // valid non-flag missing option(s) image 
    "wallpaper image.jpg" // invalid flag value 
    "wallpaper http://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621", // invalid flag value 
    "wallpaper //cdn.shopify.com/s/files/1/0031/5352/t/28/assets/favicon.ico?12375621748379006621", // invalid flag value 
    "wallpaper http://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/favicon.ico?12375621748379006621", // invalid flag value 
    "wallpaper https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/favicon.ico?12375621748379006621", // invalid flag value 
    "wallpaper https://cdn.example.com/s/files/1/0031/5352/files/holstee_logo_2.png?4803", // invalid flag value 
    "wallpaper https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621 --queue", // invalid flag value 
    "wallpaper https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621 --queue "+moment().subtract(1, "month").format("YYYY-MM-DD-HH-mm"), // invalid flag value 
    "wallpaper https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621 --queue "+moment().add(1, "month").format("YY-MM-DD-HH"), // invalid flag value 
    "wallpaper --image http://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621", // invalid flag value not https 
    "wallpaper --image //cdn.shopify.com/s/files/1/0031/5352/t/28/assets/favicon.ico?12375621748379006621", // invalid flag no protocol 
    "wallpaper --image http://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/favicon.ico?12375621748379006621", // invalid flag value not https 
    "wallpaper --image https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/favicon.ico?12375621748379006621", // invalid flag value not valid image 
    "wallpaper --image https://cdn.example.com/s/files/1/0031/5352/files/holstee_logo_2.png?4803", // invalid flag image not found 
    "wallpaper --image https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621 --queue", // invalid subflag queue missing value 
    "wallpaper --image https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621 --queue "+moment().subtract(1, "month").format("YYYY-MM-DD-HH-mm"), // invalid subflag queue date value is past 
    "wallpaper --image https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621 --queue "+moment().add(1, "month").format("YY-MM-DD-HH"), // invalid subflag queue date value format 
    "--wallpaper --image https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621", //no action non-flag 
    "--wallpaper --image https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621 --queue "+moment().add(1, "month").format("YYYY-MM-DD-HH-mm"), //no action non-flag 
    "notify", // valid non-flag missing option(s) message, open 
    'notify --message "Hello world"', // valid flag missing params open 
    'notify --open "https://www.holstee.com"', // valid flag missing params message 
    'notify --message "Hello world" --open "http://www.holstee.com"', // invalid subflag value `open` should be https 
    'notify --message "Hello world" --open "https://www.holstee.com" --queue', // invalid subflag queue missing value 
    'notify --message "Hello world" --open "https://www.holstee.com" --queue '+moment().subtract(1, "month").format("YYYY-MM-DD-HH-mm"), // invalid subflag queue date value is past 
    'notify --message "Hello world" --open "https://www.holstee.com" --queue '+moment().add(1, "month").format("YY-MM-DD-HH"), // invalid subflag queue date value format 
    '--notify --message "Hello world" --open "https://www.holstee.com"', //no action non-flag 
    '--notify --message "Hello world" --open "https://www.holstee.com --queue "'+moment().add(1, "month").format("YYYY-MM-DD-HH-mm"), //no action non-flag 
] 

var shouldNotThrow = [ 
    'notify --message "Hello world" --open "https://www.holstee.com"', 
    'notify --message "Hello world" --open "https://www.holstee.com --queue "'+moment().add(1, "month").format("YYYY-MM-DD-HH-mm"), 
    "wallpaper --image https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621", 
    "wallpaper --image https://cdn.shopify.com/s/files/1/0031/5352/t/28/assets/holstee-calendar-2015-03-flow-desktop.jpg?12375621748379006621 --queue "+moment().add(1, "month").format("YYYY-MM-DD-HH-mm"), 
] 

describe('Process Text', function(){ 
    return Promise.map(shouldThrow, function(option){ 
    it('throw error', function(){ 
     return main.processText(option).should.throw() 
    })  
    }) 
    return Promise.map(shouldNotThrow, function(option){ 
    it('throw error', function(){ 
     return main.processText(option).should.not.throw() 
    })  
    }) 
}) 

下面是我試圖測試的非工作*函數的快照。

main.processText = function(text){ 
    var args = minimist(text.split(" ")) 
    var actions = _.keys(actionsFlags) 
    var flags = _.chain(_.map(actionsFlags, _.keys)).flatten().uniq().value() 
    var extraUnparsed = _.extra(actions, args._) 
    var providedFlags = _.chain(args).keys().without("_").value() 
    var extraParsed = _.extra(flags, providedFlags) 
    var validActions = _.intersection(actions, args._) 
    var requiredFlags = _.mapObject(actionsFlags, function(flags){ 
    return _.filterObject(flags, function(flag){ 
     return flag 
    }) 
    }) 
    if(extraUnparsed.length) throw new Error("invalid unparsed argument(s): "+extraUnparsed.join(", ")) 
    if(extraParsed.length) throw new Error("invalid parsed argument(s): "+extraParsed.join(", ")) 
    if(validActions.length > 1) throw new Error("too many actions: "+validActions.join(", ")) 
    if(validActions.length == 0) throw new Error("no action: "+actions.join(", ")) 
    _.each(actions, function(action){ 
    var missingFlags = _.missing(_.keys(requiredFlags[action]), providedFlags) 
    var extraFlags = _.extra(_.keys(requiredFlags[action]), providedFlags) 
    if(_.contains(args._, action)){ 
     if(missingFlags.length) throw new Error(util.format("missing required flags for %s: %s", action, missingFlags.join(", "))) 
     if(extraFlags.length) throw new Error(util.format("extra flags for %s: %s", action, extraFlags.join(", "))) 
    } 
    }) 
    return text 
} 

注意它不是承諾，並且不返回任何承諾。我想要的驗證功能之一是檢查一個url是否響應200狀態碼，這將是一個request的承諾。如果我更新了這個函數，那麼所有的函數內容都需要嵌套在Promise.resolve(false).then()之內？也許這個承諾不應該在這個代碼塊中，並且所有的驗證操作都應該存在於其他地方？

我不知道我在做什麼，我有點沮喪。當然，我正在尋找一些金色子彈或任何能夠理解這一切的東西。

理想情況下，我可以使用一些關於如何測試這種功能的幫助。如果我稍後將其作爲承諾，我仍然希望所有測試都能正常工作。

---

下面是我所說的同步函數和承諾的一些示例代碼。

function syncFunction(value){ 
    if(!value) throw new Error("missing value") 
    return value 
} 

function asyncFunction(url){ 
    return requestPromise(url) 
} 

// Both of these will throw errors the same way they will be caught by the promise then you can use `.catch` (in bluebird). 

Promise.resolve(false).then(function(){ 
    return syncFunction() 
}) 

Promise.resolve(false).then(function(){ 
    return asyncFunction("http://404.com") 
}) 

我想這反映了我測試錯誤和判斷一件事情should或should not拋出一個錯誤，在我的測試方式。

---

我離開了承諾，它是一個同步功能，我正在測試這樣。

describe('Process Text', function(){ 
    _.each(shouldThrow, function(option){ 
    it('throw error ('+option+')', function(){ 
     expect(function(){ 
     main.textValidation(option) 
     }).to.throw() 
    }) 
    }) 
    _.each(shouldNotThrow, function(option){ 
    it('not throw error ('+option+')', function(){ 
     expect(function(){ 
     main.textValidation(option) 
     }).to.not.throw() 
    }) 
    }) 
}) 

Answer 1

強烈推薦npm install chai-as-promised

return doSomethingAsync().should.eventually.equal("foo"); 

https://github.com/domenic/chai-as-promised