How to execute only one test spec with angular-cli

Question

I have Angular2 project build with Angular-CLI  beta 20     Is there a way to run tests against only one selected spec file   I used to have a project based on Angular2 quick start  and I could manually add specs to jasmine file  But I don t know how to set this up outside of karma testing or how to limit karma tests to specific files with Angular-CLI builds

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This is working for me in Angular 7   It is based on the --main option of the ng command    I am not sure if this option is undocumented and possibly subject to change  but it works for me    I put a line in my package json file in scripts section   There using the --main option of with the ng test command  I specify the path to the  spec ts file I want to execute   For example   test 1    ng test --main E  WebRxAngularClient src app test shared my-date-utils spec ts     You can run the script as you run any such script    I run it in Webstorm by clicking on  test 1  in the npm section

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In a bash terminal I like to use the double dash  Using VS Code  you can right click on the spec file in the explorer  or on the open tab  Then select  Copy Relative Path   Run the command below pasting the relative path in from the clipboard  npm t -- --include relative path to file spec ts  The double dash signals the end of your command options for npm t and passes anything after that to the next command which is pointing to ng t  It s doesn t require any modification and quickly gives desired results

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If you want to be able to control which files are selected from the command line  I managed to do this for Angular 7   In summary  you need to install  angular-devkit build-angular browser and then create a custom webpack plugin to pass the test file regex through  For example   angular json - change the test builder from  angular-devkit build-angular browser and set a custom config file                 test                builder     angular-builders custom-webpack browser              options                  customWebpackConfig                    path      extra-webpack config js                       extra-webpack config js - create a webpack configuration that reads the regex from the command line   const webpack   require  webpack    const FILTER   process env KARMA FILTER  let KARMA SPEC FILTER      spec ts     if  FILTER      KARMA SPEC FILTER       FILTER  spec ts       module exports       plugins   new webpack DefinePlugin  KARMA SPEC FILTER        test ts - edit the spec         Then we find all the tests  declare const KARMA CONTEXT SPEC  any  const context   require context       true  KARMA CONTEXT SPEC     Then use as follows to override the default   KARMA FILTER  somefile-    spec  ts   npm run test   I documented the backstory here  apologies in advance for types and mis-links  Credit to the answer above by  Aish-Anu for pointing me in the right direction

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Adding to this for people like me who were searching for a way to run a single spec in Angular and found this SO   According to the latest Angular docs  v9 0 6 at time of writing   the ng test command has an --include option where you can specify a directory of   spec  ts tsx  files or just a single  spec  ts tsx  file itself   https   angular io cli test

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Configure test ts file inside src folder   const context   require context       true     spec  ts       Replace    spec  ts   with the file name you want to test  For example   app component  spec  ts    This will run test only for app component spec ts

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I solved this problem for myself using grunt  I have the grunt script below  What the script does is takes the command line parameter of the specific test to run and creates a copy of test ts and puts this specific test name in there   To run this  first install grunt-cli using   npm install -g grunt-cli   Put the below grunt dependencies in your package json    grunt     1 0 1    grunt-contrib-clean     1 0 0    grunt-contrib-copy     1 0 0    grunt-exec     2 0 0    grunt-string-replace     1 3 1    To run it save the below grunt file as Gruntfile js in your root folder  Then from command line run it as   grunt --target app component   This will run app component spec ts   Grunt file is as below      This gruntfile is used to run a specific test in watch mode  Example  To run app component spec ts   the Command is   grunt --target app component Do not specific  spec ts  If no target is specified it will run all tests     module exports   function grunt    var target   grunt option  target               Project configuration    grunt initConfig       pkg  grunt file readJSON  package json        clean    temp conf js   src temp-test ts        copy          main            files                  expand  false  cwd       src    karma conf js    dest   temp conf js                  expand  false  cwd       src    src test ts    dest   src temp-test ts                                       string-replace               dist                files                   temp conf js    temp conf js                  src temp-test ts    src temp-test ts                             options                  replacements                     pattern   test ts ig                  replacement   temp-test ts                                                   pattern   const context     ig                  replacement   const context   require context         true     target      spec    ts                                                           exec             sleep                The sleep command is needed here  else webpack compile fails since it seems like the files in the previous step were touched too recently           command   ping 127 0 0 1 -n 4  gt  nul             stdout  true            stderr  true                    ng test              command   ng test --config temp conf js             stdout  true            stderr  true                             Load the plugin that provides the  uglify  task      grunt loadNpmTasks  grunt-contrib-clean        grunt loadNpmTasks  grunt-contrib-copy        grunt loadNpmTasks  grunt-string-replace        grunt loadNpmTasks  grunt-exec         Default task s     grunt registerTask  default     clean   copy   string-replace   exec

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This worked for me in every case  ng test --include     dealer service spec ts   However  I usually got  quot TypeError  Cannot read property  ngModule  of null quot  for this  ng test --main src app services dealer service spec ts  Version of  angular cli 10 0 4

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Just small change need in test ts file inside src folder  const context   require context       true   test-example  spec  ts      Here  test-example is the exact file name which we need to run In the same way  if you need to test the service file only you can replace the filename like  quot  test-example service quot

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You can test only specific file with the Angular CLI  the ng command  like this    ng test --main   path to test ts   Further docs are at https   angular io cli test   Note that while this works for standalone library files  it will not work for angular components services etc  This is because angular files have dependencies on other files  namely src test ts in Angular 7   Sadly the --main flag doesn t take multiple arguments

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Each of your  spec ts file have all its tests grouped in describe block like this   describe  SomeComponent        gt         You can easily run just this single block  by prefixing the describe function name with f   fdescribe  SomeComponent        gt         If you have such function  no other describe blocks will run  Btw  you can do similar thing with it    fit and there is also a  blacklist  version - x  So    fdescribe and fit causes only functions marked this way to run xdescribe and xit causes all but functions marked this way to run

[angular] How to execute only one test spec with angular-cli

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