The detailed environment setup will be described in the next chapter named “Environment setup”. Matchers are the JavaScript function that does a Boolean comparison between an actual output and an expected output. In this chapter, we will learn how to implement different Jasmine methods to check the above-mentioned scenarios. Jasmine is an open-source framework and easily available in different versions like stand-alone, ruby gem, Node.js, etc. The following screenshot will appear as a result. Jasmine follows Behavior Driven Development (BDD) procedure to ensure that each line of JavaScript statement is properly unit tested. Step 6 − Execute by running SpecRunner.html. Please modify the customerMatcher.js file accordingly. Jasmine. Jasmine also provides different methods to provide sequentiality of the JS output. In our upcoming examples, we will go through many describe blocks to understand the working flow of Jasmine suite block. The following example will help us understand the working principle of the toBeTruthy() function. Spec.js(Test case file) − This is the JavaScript file that contains all the test cases which is required to test any JavaScript function or file. Hence it will produce the following output. There are two type of matchers Inbuilt matcher and Custom matchers. As we are passing number 5, which is smaller than 10, this test case will pass and give us the following output. It is preferable to use the most recent version that is “Edge”. Installation The above code will generate the following screenshot as an output. In this phase, we will make our environment ready for Jasmine application. As seen earlier, not is nothing but a negation of the toBe() method. It is helpful to find whether a specific String is present in the expected output or not. Jasmine comes with a clean syntax that is very close to a natural language. 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. The following example will help you understand the basic working principles of toBeFalsy(). Jasmine is an open-source framework and easily available in different versions like stand-alone, ruby gem, Node.js, etc. Like describe block we have been introduced to IT block too. Definitely this is going to be fail as there is no such file or function present in our project that can be tested. As true cannot be same as false, this test case will be valid and pass through. Now, for this test case to fail, we need to omit that throw statement in the function throwMeAnError. In this chapter, we will learn more about these two methodologies. As can be seen, we have commented that line from where our method was throwing the exception. Refactor is a very important phase of BDD model where we need to prepare as many test cases as we can for that particular application or function. After adding this file into the SpecRunner, we will receive a green color screenshot as an output, which tells us that this value is actually not defined previously. As the name signifies this matcher helps to check null values. In the following example, we will modify our customerMatcherSpec.js file and see how this actually works. Let us modify our customerMatcher.js using the following piece of code. As currentVal is defined to 0 in the beginning, this test will pass and generate a green screenshot as an output. The above code will generate the following output. Again in the above example, let us remove the first line, where we actually define “currentVal” and run again. Let us turn both the variables, name and name1 as String type variables and run the same SpecRunner.html again. toBe() matcher works in a similar way as toEqual(), however they are technically different from each other. This file is saved inside the src directory. Let us create a new spec file “spyJasmineSpec.js” and another js file named as “spyJasmine.js”. The above piece of code will generate the following output as a result of running specRunner.html file after adding this file inside the head section. Remember you need to add these files into the header section of specRunner.html file as directed in the earlier example. It contains two other blocks, one is “Describe()” and another one is “It()”. In the following example, we will see how the custom matcher works. toBeFalsy() also works the same way as toBeTruthy() method. Jasmine provides plenty of methods which help us check the equality of any JavaScript function and file. The following example will help you understand how this matcher works. All the syntax used in Jasmine framework is clean and obvious. The above code will pass the Jasmine test case as we are passing value more than 10 and expected the output to be false. Step 2 − Click on any of the version link. Till now we have seen the success test case of the hello world application. If everything is going well then your application must be ready and up. The following example will help you understand the working principle of the toBe() matcher.

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