Angular CLI - ng e2e Command


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This chapter explains the syntax, argument and options of ng e2e command along with an example. Here, e2e refers to end to end.

Syntax

The syntax for ng e2e command is as follows −

ng e2e <project> [options]
ng e <project> [options]

ng e2e builds, serves an application and then runs the end to end test cases using protractor. Options are optional parameters.

Arguments

The argument for ng e2e command is as follows −

Sr.No. Argument & Syntax Description
1 <project> The name of the project to test.

Options

Options are optional parameters.

Sr.No. Option & Syntax Description
1 --baseUrl=baseUrl Base URL for protractor to connect to.
2 --configuration=configuration

A named build target, as specified in the "configurations" section of angular.json. Each named target is accompanied by a configuration of option defaults for that target. Setting this explicitly overrides the "--prod" flag

Aliases: -c

3 --devServerTarget=devServerTarget Dev server target to run tests against.
4 --grep=grep Execute specs whose names match the pattern, which is internally compiled to a RegExp.
5 --help=true|false|json|JSON

Shows a help message for this command in the console.

Default: false

6 --host=host Host to listen on.
7 --invertGrep=true|false

Invert the selection specified by the 'grep' option.

Default: false

8 --port The port to use to serve the application.
9 --prod=true|false Shorthand for "--configuration=production". When true, sets the build configuration to the production target. By default, the production target is set up in the workspace configuration such that all builds make use of bundling, limited tree-shaking, and also limited dead code elimination.
10 --protractorConfig=protractorConfig The name of the Protractor configuration file.
11 --specs Override specs in the protractor config.
12 --suite=suite Override suite in the protractor config.
13 --webdriverUpdate=true|false

Try to update webdriver.

Default: true

First move to an angular project updated using ng build command.which is available at https://www.tutorialspoint.com/angular_cli/angular_cli_ng_build.htm.

Now run the e2e command.

Example

An example for ng e2e command is given below −

\>Node\>TutorialsPoint> ng e2e
...
chunk {main} main.js, main.js.map (main) 14.3 kB [initial] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 141 kB [initial] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 6.15 kB [entry] [rendered]
chunk {styles} styles.js, styles.js.map (styles) 12.4 kB [initial] [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 3 MB [initial] [rendered]
Date: 2020-06-06T04:20:15.029Z - Hash: 16f321e3d4599af26622 - Time: 20899ms
** Angular Live Development Server is listening on localhost:4200, open your bro
wser on http://localhost:4200/ **
: Compiled successfully.
...
   workspace-project App
    x should display welcome message
      - Failed: No element found using locator: By(css selector, app-root .content span)
   ...
      From: Task: Run it("should display welcome message") in control flow
   ...
**************************************************
*                    Failures                    *
**************************************************

1) workspace-project App should display welcome message
  - Failed: No element found using locator: By(css selector, app-root .content span)

Executed 1 of 1 spec (1 FAILED) in 2 secs.

Now to fix failures update the app.component.html

app.component.html

<div class="content" role="main">
   <span>{{ title }} app is running!</span>
</div>
<app-goals></app-goals>
<router-outlet></router-outlet>

Now run the e2e command.

Example

An example for ng e2e command is given below −

\>Node\>TutorialsPoint> ng e2e
...
chunk {main} main.js, main.js.map (main) 14.9 kB [initial] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 141 kB [initial] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 6.15 kB [entry] [rendered]
chunk {styles} styles.js, styles.js.map (styles) 12.4 kB [initial] [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 3 MB [initial] [rendered]
Date: 2020-06-06T04:28:33.514Z - Hash: 5d8bf2fc7ff59fa390b0 - Time: 10529ms
** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
: Compiled successfully.
...
   workspace-project App
      √ should display welcome message

Executed 1 of 1 spec SUCCESS in 2 secs.

ng e2e also opens the browser and use it to run acceptance test cases using UI.

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