{"id":78,"date":"2019-04-09T19:56:07","date_gmt":"2019-04-09T19:56:07","guid":{"rendered":"http:\/\/yer.ac\/blog\/?p=78"},"modified":"2019-04-10T10:58:03","modified_gmt":"2019-04-10T10:58:03","slug":"debugging-es6-mocha-unit-tests-using-vs-code","status":"publish","type":"post","link":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/","title":{"rendered":"Debugging ES6 Mocha unit tests using VS Code"},"content":{"rendered":"\n

The world of Mocha, VS Code and Node is still fairly new to me. Typically in the past all my JS unit tests have been debuggable in-browser using DevTools, but with Mocha this is not the case (As I am not deploying my spec files). I got Mocha to load via a launch config, but it would not originally work due to using ES6 directly.<\/p>\n\n\n\n

If you do not have a launch.json, start here. Otherwise skip to the next section<\/strong>. Add a new Debug Configuration by selecting “Debug”, and then “Add Configuration”. Selecting “Node.js” automatically creates a “launch.json” under a root folder named .vscode. If you already had debug set up, this step would be irrelevant.<\/p>\n\n\n\n

Add Mocha configuration to launch.json<\/h2>\n\n\n\n

In the launch.json, much like the surprisingly helpful comments suggest, you can simply type “Mocha” then [ctrl]+[space] to bring up the intellisense for a Mocha configuration!<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Which will insert the appropriate snippet.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Now, in theory it is as simple as clicking the play icon in debug, with “Mocha Tests” selected.<\/p>\n\n\n\n

\"\"<\/figure><\/div>\n\n\n\n

Supporting ES6.<\/h2>\n\n\n\n

For me however, this didn’t<\/strong> work. <\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

The issue here is that I get a lot of unexpected token errors as my tests are using ES6 and I suspect that by default it wants to use ES5. The issue of using ES6 for unit tests was resolved in another post<\/a> .<\/p>\n\n\n\n

Much like my previous post, I can update the launch arguments to use require to pull in the same 2 Babel modules, and will also specify a wild card file name of my tests so it doesn’t pick up any other code.<\/p>\n\n\n\n

 {\n            \"type\": \"node\",\n            \"request\": \"launch\",\n            \"name\": \"Mocha Tests\",\n            \"program\": \"${workspaceFolder}\/node_modules\/mocha\/bin\/_mocha\",\n            \"args\": [\n                \".\/test\/**\/*.spec.js\",\n                \"--require\", \"@babel\/polyfill\",\n                \"--require\", \"@babel\/register\",\n                \"-u\",\n                \"tdd\",\n                \"--timeout\",\n                \"999999\",\n                \"--colors\",           \n            ],\n            \"internalConsoleOptions\": \"openOnSessionStart\"\n        }<\/code><\/pre>\n\n\n\n
Now for me, this also didn’t work as I am using Chai for my BDD test syntax.<\/p>\n\n\n\n
For this I had to change “tdd” to “bdd” under the args.<\/p>\n\n\n\n
Now I can attach and debug, providing a breakpoint is set!<\/p>\n","protected":false},"excerpt":{"rendered":"
The world of Mocha, VS Code and Node is still fairly new to me. Typically in the past all my JS unit tests have been debuggable in-browser using DevTools, but with Mocha this is not the case (As I am not deploying my spec files). I got Mocha to load via a launch config, but …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[6,11],"tags":[16,12,13,14],"class_list":["post-78","post","type-post","status-publish","format-standard","hentry","category-development","category-testing","tag-es6","tag-javascript","tag-mocha","tag-vscode"],"yoast_head":"\nDebugging ES6 Mocha unit tests using VS Code - yer.ac | Adventures of a developer, and other things.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Debugging ES6 Mocha unit tests using VS Code - yer.ac | Adventures of a developer, and other things.\" \/>\n<meta property=\"og:description\" content=\"The world of Mocha, VS Code and Node is still fairly new to me. Typically in the past all my JS unit tests have been debuggable in-browser using DevTools, but with Mocha this is not the case (As I am not deploying my spec files). I got Mocha to load via a launch config, but …\" \/>\n<meta property=\"og:url\" content=\"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/\" \/>\n<meta property=\"og:site_name\" content=\"yer.ac | Adventures of a developer, and other things.\" \/>\n<meta property=\"article:published_time\" content=\"2019-04-09T19:56:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-04-10T10:58:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/i2.wp.com\/yer.ac\/blog\/wp-content\/uploads\/2019\/04\/image-1.png?fit=700%2C283\" \/>\n<meta name=\"author\" content=\"yer.ac\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"yer.ac\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/\"},\"author\":{\"name\":\"yer.ac\",\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/#\\\/schema\\\/person\\\/4638b9d868c7d3747bd3bb01fbc8153d\"},\"headline\":\"Debugging ES6 Mocha unit tests using VS Code\",\"datePublished\":\"2019-04-09T19:56:07+00:00\",\"dateModified\":\"2019-04-10T10:58:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/\"},\"wordCount\":320,\"commentCount\":2,\"publisher\":{\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/#\\\/schema\\\/person\\\/4638b9d868c7d3747bd3bb01fbc8153d\"},\"image\":{\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/i2.wp.com\\\/yer.ac\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/image-1.png?fit=700%2C283\",\"keywords\":[\"ES6\",\"Javascript\",\"Mocha\",\"VSCODE\"],\"articleSection\":[\"Development\",\"Testing\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/\",\"url\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/\",\"name\":\"Debugging ES6 Mocha unit tests using VS Code - yer.ac | Adventures of a developer, and other things.\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/i2.wp.com\\\/yer.ac\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/image-1.png?fit=700%2C283\",\"datePublished\":\"2019-04-09T19:56:07+00:00\",\"dateModified\":\"2019-04-10T10:58:03+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/#primaryimage\",\"url\":\"https:\\\/\\\/i2.wp.com\\\/yer.ac\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/image-1.png?fit=700%2C283\",\"contentUrl\":\"https:\\\/\\\/i2.wp.com\\\/yer.ac\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/04\\\/image-1.png?fit=700%2C283\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/2019\\\/04\\\/09\\\/debugging-es6-mocha-unit-tests-using-vs-code\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/yer.ac\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Debugging ES6 Mocha unit tests using VS Code\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/yer.ac\\\/blog\\\/\",\"name\":\"yer.ac | Adventures of a developer, and other things.\",\"description\":\"Blog to keep track of things I am upto\",\"publisher\":{\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/#\\\/schema\\\/person\\\/4638b9d868c7d3747bd3bb01fbc8153d\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/yer.ac\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\\\/\\\/yer.ac\\\/blog\\\/#\\\/schema\\\/person\\\/4638b9d868c7d3747bd3bb01fbc8153d\",\"name\":\"yer.ac\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/67ed010c9cc7986d40647e061c6dcdb06d818776591c7e954055adb629621113?s=96&d=retro&r=pg\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/67ed010c9cc7986d40647e061c6dcdb06d818776591c7e954055adb629621113?s=96&d=retro&r=pg\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/67ed010c9cc7986d40647e061c6dcdb06d818776591c7e954055adb629621113?s=96&d=retro&r=pg\",\"caption\":\"yer.ac\"},\"logo\":{\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/67ed010c9cc7986d40647e061c6dcdb06d818776591c7e954055adb629621113?s=96&d=retro&r=pg\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Debugging ES6 Mocha unit tests using VS Code - yer.ac | Adventures of a developer, and other things.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/","og_locale":"en_US","og_type":"article","og_title":"Debugging ES6 Mocha unit tests using VS Code - yer.ac | Adventures of a developer, and other things.","og_description":"The world of Mocha, VS Code and Node is still fairly new to me. Typically in the past all my JS unit tests have been debuggable in-browser using DevTools, but with Mocha this is not the case (As I am not deploying my spec files). I got Mocha to load via a launch config, but …","og_url":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/","og_site_name":"yer.ac | Adventures of a developer, and other things.","article_published_time":"2019-04-09T19:56:07+00:00","article_modified_time":"2019-04-10T10:58:03+00:00","og_image":[{"url":"https:\/\/i2.wp.com\/yer.ac\/blog\/wp-content\/uploads\/2019\/04\/image-1.png?fit=700%2C283","type":"","width":"","height":""}],"author":"yer.ac","twitter_card":"summary_large_image","twitter_misc":{"Written by":"yer.ac","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/#article","isPartOf":{"@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/"},"author":{"name":"yer.ac","@id":"https:\/\/yer.ac\/blog\/#\/schema\/person\/4638b9d868c7d3747bd3bb01fbc8153d"},"headline":"Debugging ES6 Mocha unit tests using VS Code","datePublished":"2019-04-09T19:56:07+00:00","dateModified":"2019-04-10T10:58:03+00:00","mainEntityOfPage":{"@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/"},"wordCount":320,"commentCount":2,"publisher":{"@id":"https:\/\/yer.ac\/blog\/#\/schema\/person\/4638b9d868c7d3747bd3bb01fbc8153d"},"image":{"@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/#primaryimage"},"thumbnailUrl":"https:\/\/i2.wp.com\/yer.ac\/blog\/wp-content\/uploads\/2019\/04\/image-1.png?fit=700%2C283","keywords":["ES6","Javascript","Mocha","VSCODE"],"articleSection":["Development","Testing"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/","url":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/","name":"Debugging ES6 Mocha unit tests using VS Code - yer.ac | Adventures of a developer, and other things.","isPartOf":{"@id":"https:\/\/yer.ac\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/#primaryimage"},"image":{"@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/#primaryimage"},"thumbnailUrl":"https:\/\/i2.wp.com\/yer.ac\/blog\/wp-content\/uploads\/2019\/04\/image-1.png?fit=700%2C283","datePublished":"2019-04-09T19:56:07+00:00","dateModified":"2019-04-10T10:58:03+00:00","breadcrumb":{"@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/#primaryimage","url":"https:\/\/i2.wp.com\/yer.ac\/blog\/wp-content\/uploads\/2019\/04\/image-1.png?fit=700%2C283","contentUrl":"https:\/\/i2.wp.com\/yer.ac\/blog\/wp-content\/uploads\/2019\/04\/image-1.png?fit=700%2C283"},{"@type":"BreadcrumbList","@id":"https:\/\/yer.ac\/blog\/2019\/04\/09\/debugging-es6-mocha-unit-tests-using-vs-code\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/yer.ac\/blog\/"},{"@type":"ListItem","position":2,"name":"Debugging ES6 Mocha unit tests using VS Code"}]},{"@type":"WebSite","@id":"https:\/\/yer.ac\/blog\/#website","url":"https:\/\/yer.ac\/blog\/","name":"yer.ac | Adventures of a developer, and other things.","description":"Blog to keep track of things I am upto","publisher":{"@id":"https:\/\/yer.ac\/blog\/#\/schema\/person\/4638b9d868c7d3747bd3bb01fbc8153d"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/yer.ac\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":["Person","Organization"],"@id":"https:\/\/yer.ac\/blog\/#\/schema\/person\/4638b9d868c7d3747bd3bb01fbc8153d","name":"yer.ac","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/67ed010c9cc7986d40647e061c6dcdb06d818776591c7e954055adb629621113?s=96&d=retro&r=pg","url":"https:\/\/secure.gravatar.com\/avatar\/67ed010c9cc7986d40647e061c6dcdb06d818776591c7e954055adb629621113?s=96&d=retro&r=pg","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/67ed010c9cc7986d40647e061c6dcdb06d818776591c7e954055adb629621113?s=96&d=retro&r=pg","caption":"yer.ac"},"logo":{"@id":"https:\/\/secure.gravatar.com\/avatar\/67ed010c9cc7986d40647e061c6dcdb06d818776591c7e954055adb629621113?s=96&d=retro&r=pg"}}]}},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/paP5IW-1g","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/posts\/78","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/comments?post=78"}],"version-history":[{"count":2,"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/posts\/78\/revisions"}],"predecessor-version":[{"id":84,"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/posts\/78\/revisions\/84"}],"wp:attachment":[{"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/media?parent=78"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/categories?post=78"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yer.ac\/blog\/wp-json\/wp\/v2\/tags?post=78"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}