In this example, validateAge() works as a custom matcher. Jasmine also allows the developers to skip one or more than one test cases. This matcher helps to check the less than condition of the test scenario. The detailed environment setup will be described in the next chapter named “Environment setup”. The above code will generate the following output. Intro to BDD; Writing Testable JS Code; Setup; Jasmine Matchers; Jasmine jQuery; Fixtures; Runs / Waits; Spies; Intro to BDD (Behavior Driven Development) In a BDD style test you describe your code and tell the test what it should be doing. Function add will add two numbers given as an argument to that function and another function addAny should add any numbers given as an argument. Let us modify our two js files using the following code. Hence, this piece of code will generate the following green screenshot. Let us create a new spec file “spyJasmineSpec.js” and another js file named as “spyJasmine.js”. We will slightly modify our expectexam JavaScript file.

Step 4 − Once you are redirected to github release page, download the Zip file from there. Add this JS file into SpecRunner.html and run the same. This phase is crucial as we need to make sure that all the test cases we had prepared in the early stage will be successful. Now our application is ready to be tested by Jasmine framework. The following example shows how Inbuilt Matcher works in Jasmine framework. toBeCloseTo() matcher matches whether the actual value is close to the expected value. This matcher helps to check whether any variable is previously undefined or not, basically it works simply opposite to the previous matcher that is toBeDefined. In the expect block, the toBeNull() matcher will check this value and give us the result accordingly. Now check the output. In this phase, we will make our environment ready for Jasmine application. toBe() matcher matches with the type of the object whereas toEqual() matches with the equivalency of the result.

Jasmine does not depend on any other JavaScript framework. We will modify the previous example using “x” just before it statement. In the above code, we have mentioned one variable ”value” and we have explicitly mentioned this value as null. We added two new variables, name and name1. Now to make this fail, we need to assign some bigger number to the variable exp.

In the following example, we will learn how to skip a specific Spec or Suite using “x” character. Jasmine is a testing framework, hence it always aims to compare the result of the JavaScript file or function with the expected result. Each of the Expect block is also known as a matcher.

We have two files to be tested named as “expectexam.js” and another one through which we need to test is “expectSpec.js”. The following flowchart depicts the different phases of BDD framework. All you need to download is the standalone library files from the official website https://jasmine.github.io/ and implement the same in your application. The matchers which are not present in the inbuilt system library of Jasmine is called as custom matcher.

Hence, it will pass the test case but after running the first it block, Jasmine compile ran the afterEach() block, which makes the value of the currentVal to 5. Following is the entry of these two files. Following is an example of Expect block. Let us modify our customerMatcher.js with the following code. After creating the project, the project directory should look like the following screenshot. In this example, createSpy() method actually mimics the functionality of the getName11(). Suite is the basic building block of Jasmine framework. One Suite block can have only two parameters, one “name of that suite” and another “Function declaration” that actually makes a call to our unit functionality that is to be tested. This is the final step of our application development. In this chapter, we will discuss the building blocks of test by Jasmine. ToMatch() matcher works on String type variable. Installation Here although we have declared one variable as “0” in the beginning, we are expecting this value should be equal to 5 in the expectation block. In this step, we will modify “SpecRunner.html” to include the reference of these two newly created file. Jasmine is a little Behavior-Driven Development framework, created by the guys at Pivotal Labs to allow you to write automated JavaScript unit tests. As seen earlier, not is nothing but a negation of the toBe() method. Hence, the browser will show us a green sign which means it has passed. Apart from different computational matchers, Jasmine provides some useful matchers to check exception of the program. The above code is definitely going to fail because our spec file is not getting the expected string as an output of the helloworld(). The matchers which are not present in the inbuilt system library of Jasmine is called as custom matcher. Following is the code which will yield a red screenshot as an output since the code does not satisfy our requirement. In this step, we will create a JavaScript file named helloworld.js under src folder. jasmine-node. The following screenshot of the specRunner.html file depicts that there is an error with its red indicator. Although this function is not present in the person object in spy Jasmine.js, we are not getting any error and hence the output is green and positive. toBe() matcher works in a similar way as toEqual(), however they are technically different from each other. Definitely this is going to be fail as there is no such file or function present in our project that can be tested. Jasmine provides a special matcher to check this special type of testing scenario that is toBeNaN(). In the above code, toBeDefined() will check whether the variable currentVal is defined in the system or not.