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The rapid development of the Internet has brought unprecedented challenges to web developers. For front-end development, the front-end development ER needs to write JS is not those few lines of visual effect code. The large increase in code volume, multi-person synergy, personnel quality disparity, this requires a standard, to the normative control of the code. Jasmine as a test framework used by a front-end team, it should be shipped.
1, Jasmine Introduction
Jasmine is a framework for writing JavaScript tests that does not depend on any other JavaScript framework. It has a clever and clear syntax that allows you to easily write test code. Currently the latest version is 2.0.0.
In Jasmine, a typical unit test starts with a global function Describe,describe contains n it functions, and an IT function contains n assertions.
A basic test code is as follows:
function () { It (function() { expect (true). ToBe (true); });});2. Download Jasmine
You can download it by clicking on the link below:
Https://github.com/pivotal/jasmine/tree/master/dist
We recommend downloading the 2.0.0 version of the ZIP package.
After extracting, we go to lib\jasmine-2.0.0 in the file directory, which usually includes the following files.
These files are required for us to do the JS test.
3, Jasmine's dependence
The operation of the Jasmine depends on 4 parts:
1) Operating Environment
Browser (ie,firefox,chrome)
2) source file
JS Footsteps Written by developers
3) test File
Test scripts that conform to JASMINEAPI
4) Output Results
Web-based output or console output
4, the use of jasmine
We create a new test.html file in the project with the following principal code:
<!DOCTYPE HTML><HTML><Head> <Metahttp-equiv= "Content-type"content= "Text/html;charset=utf-8"> <title>JASMINE-JS Unit Test Framework</title> <Linkrel= "stylesheet"href= "Jasmine/jasmine.css"> <Scriptsrc= "Jasmine/jasmine.js"></Script> <Scriptsrc= "Jasmine/jasmine-html.js"></Script> <Scriptsrc= "Jasmine/boot.js"></Script></Head><Body><Div> <P>JS Unit Test</P></Div><Scriptsrc= "Src.js"></Script><Scriptsrc= "Test.js"></Script></Body></HTML>
In the page we introduced 5 JS files and a CSS file.
The core file of the Jasmine.js:jasmine framework.
Jasmine-html.js: JS file for Web page result output.
The startup script for the Boot.js:jasmine framework. It is worth noting that the execution of this script should be done after the jasmine.js is loaded.
Src.js: Our business logic script.
Test.js:jasmine test Scripts.
JASMINE.CSS: A style file that controls the output of a Web page result.
Let's take a look at the Src.js file, we've defined a showname function
function ShowName (name) { return ' My name is ' +name;}We write the test script within Test.js:
Describe (' Just a test ',function() { It (' Test showname ',function() { var a= ' ck '; var exp= ' My name is ck '; Expect (exp). Toequal (ShowName (a)); } );The browser side runs the test.html file with the output as follows:
This shows that our script passed the test successfully.
We modify the Test.js file
var exp= ' My name is mm ';
Run the test.html file again and enter the following:
You can see the Jasmine print out the error messages.
With this simple example, we can see that it is very convenient to use Jasmine for unit testing.
5. API
Describe (string,function)
Global function, receive two parameters
String: Description of the function
Function: Test group functions
It (string,function)
A test specs, receiving two parameters
Name of the String:spces
function:spces function
Beforeeach (function)
Define what to do before all it execution in a describe
Aftereach (function)
Define what to do after all it execution in a describe
ToBe
equals = = =, Comparison variable
Toequal
Handling variables, arrays, objects, etc.
Tomatch
Match using regular style
tobedefined
is declared and assigned
tobeundefined
is not declared
Tobenull
Is null
Tobetruthy
True if converted to a Boolean value
Tobefalsy
False if converted to a Boolean value
Tocontain
Whether the array contains elements (values). Only for arrays, not for objects
Tobelessthan
Numeric comparison, less than
Tobegreaterthan
Numeric comparison, greater than
Tobecloseto
Define precision when comparing values, rounding before comparing
Tothrow
Checks if a function throws an error
function () { varfunction() { return 1 + 2; }; var function () { return a + 1; }; Expect (foo). Not.tothrow (); Expect (bar). Tothrow ();});Jasmine also has a powerful spy function, it can monitor the function of the call situation, because the content is more involved and the article just play a role, so I do not list, we are interested can go to the official website for in-depth understanding.
Website Link: http://jasmine.github.io/2.0/introduction.html
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