Unit testing in Angular

Writing simple isolated unit test

Unit tests are a very important part of the programming process. Over the years it gains more and more traction. Going the path from exotics and, sometimes, weird implementation, extreme practices like TDD. From the geek’s toy to the mainstream. From the back-end to the front-end. Now unit tests are a “must-have” tool in the professional programmer’s toolset. This small article will tell about the front-end unit testing with Angular by using built-in test tools Karma and jasmine.

Types of automated tests.

There are 3 main types of automated tests. There are no strict borders between them and it can be arguably hard to decide which test falls in which category.

Unit testing — test of one “unit” of code. It can be a class, or method, with mocked dependencies. We will use this type of test here.

Integration testing — Few classes testing integrated. For example, for the back-end, it can be service and repository testing together, or service and component testing for the front-end.

End to end testing — full application testing, from front-end to back-end, that’s why it is called a (front) end to (back) end testing. In these tests usually live services using and nothing is mocked. it fully reproduces the real application work.

The task — unit test of the method.

Let’s imagine that we already have the simple Angular application — well known “Tour of heroes”. And we want to validate the name of the hero by its length. Let’s imagine that we don’t want the hero’s name less than 3 symbols.

#angular #unit-testing #unit-test-tools

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Basic Introduction to Unit Testing in Angular

What is Unit Testing?

Unit testing is testing a unit in an isolated environment. A unit can be a class, component, service, directive module, etc. which can be logically separated from the software. Any unit in an app is not isolated, it’s quite normal that it will be depending on the other units in an application for resources like data or methods.

So if we do an integrated test of the application and it fails then it’s hard to identify where exactly the code is breaking. So the purpose of unit testing is to test each unit individually and see if it’s working fine.

Benefits of Unit Testing

Reveal design mistakes

You may encounter difficulty while writing tests which might reveal that the design is not correct and you may be violating some important coding principles. Or after running the test it shows unexpected behavior.

Add new features without breaking anything

If you add any new feature into existing code and after running test passes then you can be confident it won’t break the application.

Simplifies debugging process

As discussed earlier it makes it easy to exactly identify where the code is breaking.

Tests make developers more confident about their work

So, we will understand unit testing in angular by looking at some basic simple examples and then getting to know why and how we have done.

#angular #angular #angular9 #jasmine #karma #testing #unit tesing in angular #unit testing

Software Testing 101: Regression Tests, Unit Tests, Integration Tests

Automation and segregation can help you build better software
If you write automated tests and deliver them to the customer, he can make sure the software is working properly. And, at the end of the day, he paid for it.

Ok. We can segregate or separate the tests according to some criteria. For example, “white box” tests are used to measure the internal quality of the software, in addition to the expected results. They are very useful to know the percentage of lines of code executed, the cyclomatic complexity and several other software metrics. Unit tests are white box tests.

#testing #software testing #regression tests #unit tests #integration tests

Testing Microservices Applications

The shift towards microservices and modular applications makes testing more important and more challenging at the same time. You have to make sure that the microservices running in containers perform well and as intended, but you can no longer rely on conventional testing strategies to get the job done.

This is where new testing approaches are needed. Testing your microservices applications require the right approach, a suitable set of tools, and immense attention to details. This article will guide you through the process of testing your microservices and talk about the challenges you will have to overcome along the way. Let’s get started, shall we?

A Brave New World

Traditionally, testing a monolith application meant configuring a test environment and setting up all of the application components in a way that matched the production environment. It took time to set up the testing environment, and there were a lot of complexities around the process.

Testing also requires the application to run in full. It is not possible to test monolith apps on a per-component basis, mainly because there is usually a base code that ties everything together, and the app is designed to run as a complete app to work properly.

Microservices running in containers offer one particular advantage: universal compatibility. You don’t have to match the testing environment with the deployment architecture exactly, and you can get away with testing individual components rather than the full app in some situations.

Of course, you will have to embrace the new cloud-native approach across the pipeline. Rather than creating critical dependencies between microservices, you need to treat each one as a semi-independent module.

The only monolith or centralized portion of the application is the database, but this too is an easy challenge to overcome. As long as you have a persistent database running on your test environment, you can perform tests at any time.

Keep in mind that there are additional things to focus on when testing microservices.

• Microservices rely on network communications to talk to each other, so network reliability and requirements must be part of the testing.
• Automation and infrastructure elements are now added as codes, and you have to make sure that they also run properly when microservices are pushed through the pipeline
• While containerization is universal, you still have to pay attention to specific dependencies and create a testing strategy that allows for those dependencies to be included

Test containers are the method of choice for many developers. Unlike monolith apps, which lets you use stubs and mocks for testing, microservices need to be tested in test containers. Many CI/CD pipelines actually integrate production microservices as part of the testing process.

Contract Testing as an Approach

As mentioned before, there are many ways to test microservices effectively, but the one approach that developers now use reliably is contract testing. Loosely coupled microservices can be tested in an effective and efficient way using contract testing, mainly because this testing approach focuses on contracts; in other words, it focuses on how components or microservices communicate with each other.

Syntax and semantics construct how components communicate with each other. By defining syntax and semantics in a standardized way and testing microservices based on their ability to generate the right message formats and meet behavioral expectations, you can rest assured knowing that the microservices will behave as intended when deployed.

Ways to Test Microservices

It is easy to fall into the trap of making testing microservices complicated, but there are ways to avoid this problem. Testing microservices doesn’t have to be complicated at all when you have the right strategy in place.

There are several ways to test microservices too, including:

• Unit testing: Which allows developers to test microservices in a granular way. It doesn’t limit testing to individual microservices, but rather allows developers to take a more granular approach such as testing individual features or runtimes.
• Integration testing: Which handles the testing of microservices in an interactive way. Microservices still need to work with each other when they are deployed, and integration testing is a key process in making sure that they do.
• End-to-end testing: Which⁠—as the name suggests⁠—tests microservices as a complete app. This type of testing enables the testing of features, UI, communications, and other components that construct the app.

What’s important to note is the fact that these testing approaches allow for asynchronous testing. After all, asynchronous development is what makes developing microservices very appealing in the first place. By allowing for asynchronous testing, you can also make sure that components or microservices can be updated independently to one another.

#blog #microservices #testing #caylent #contract testing #end-to-end testing #hoverfly #integration testing #microservices #microservices architecture #pact #testing #unit testing #vagrant #vcr

Unit testing in Angular

Writing simple isolated unit test

Unit tests are a very important part of the programming process. Over the years it gains more and more traction. Going the path from exotics and, sometimes, weird implementation, extreme practices like TDD. From the geek’s toy to the mainstream. From the back-end to the front-end. Now unit tests are a “must-have” tool in the professional programmer’s toolset. This small article will tell about the front-end unit testing with Angular by using built-in test tools Karma and jasmine.

Types of automated tests.

There are 3 main types of automated tests. There are no strict borders between them and it can be arguably hard to decide which test falls in which category.

Unit testing — test of one “unit” of code. It can be a class, or method, with mocked dependencies. We will use this type of test here.

Integration testing — Few classes testing integrated. For example, for the back-end, it can be service and repository testing together, or service and component testing for the front-end.

End to end testing — full application testing, from front-end to back-end, that’s why it is called a (front) end to (back) end testing. In these tests usually live services using and nothing is mocked. it fully reproduces the real application work.

The task — unit test of the method.

Let’s imagine that we already have the simple Angular application — well known “Tour of heroes”. And we want to validate the name of the hero by its length. Let’s imagine that we don’t want the hero’s name less than 3 symbols.

#angular #unit-testing #unit-test-tools

Install Angular - Angular Environment Setup Process

Angular is a TypeScript based framework that works in synchronization with HTML, CSS, and JavaScript. To work with angular, domain knowledge of these 3 is required.

1. Installing Node.js and npm
2. Installing Angular CLI
3. Creating workspace
4. Deploying your First App

In this article, you will get to know about the Angular Environment setup process. After reading this article, you will be able to install, setup, create, and launch your own application in Angular. So let’s start!!!

Install Angular in Easy Steps

For Installing Angular on your Machine, there are 2 prerequisites:

• Node.js
• npm Package Manager

Node.js

First you need to have Node.js installed as Angular require current, active LTS or maintenance LTS version of Node.js

Download and Install Node.js version suitable for your machine’s operating system.

Npm Package Manager

Angular, Angular CLI and Angular applications are dependent on npm packages. By installing Node.js, you have automatically installed the npm Package manager which will be the base for installing angular in your system. To check the presence of npm client and Angular version check of npm client, run this command:

1. npm -v

Installing Angular CLI

• Open Terminal/Command Prompt
• To install Angular CLI, run the below command:

1. npm install -g @angular/cli

· After executing the command, Angular CLI will get installed within some time. You can check it using the following command

1. ng --version

Workspace Creation

Now as your Angular CLI is installed, you need to create a workspace to work upon your application. Methods for it are:

• Using CLI
• Using Visual Studio Code

1. Using CLI

To create a workspace:

• Navigate to the desired directory where you want to create your workspace using cd command in the Terminal/Command prompt
• Then in the directory write this command on your terminal and provide the name of the app which you want to create. In my case I have mentioned DataFlair:

1. Ng new YourAppName

• After running this command, it will prompt you to select from various options about the CSS and other functionalities.

• To leave everything to default, simply press the Enter or the Return key.

#angular tutorials #angular cli install #angular environment setup #angular version check #download angular #install angular #install angular cli