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Last Updated: 23 Nov 2023

- Tech Lead Engineer with 7+ years of experience in software engineering and computer science education. - Proficient in programming languages such as PHP, JavaScript, and TypeScript. - Experienced in working with CMS and frameworks like Symfony, Laravel, Shopify, React, Vue.js, and Node.js. - Skilled in programming technologies including REST API, HTML/CSS, JSON/XML, jQuery, Redux, Doctrine ORM, and Eloquent ORM. - Knowledgeable in cloud platforms like AWS and databases such as MySQL, PostgreSQL, MongoDB, and Redis. - Proficient in DevOps tools like Docker, Docker Compose, Vagrant, CI/CD, Jenkins, Kubernetes, and Ansible. - Experienced in using source control systems like Git (GitHub/GitLab/BitBucket) for version control.

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-Software Engineer with 5 years of professional experience, working across eCommerce & retail, Marketplace, Healthcare, Entertainment, Education, and Blockchain, Game domains. -Proficiency in PHP, JavaScript, TypeScript, React - Knowledge of Vanilla JS, Native PHP, PHP-Selenium - Experience working with Web3 marketplaces, nodes, on-chain, and off-chain transactions - Knowledge of Web3, understanding of Abi, Smart Contracts; Tampermonkey, Greasyfork - Knowledge Css3, Bootstrap 4; RPC; GitHub; MySQL - Has a successful track record of developing applications from scratch and optimizing existing systems, evidenced by projects such as a Learning Platform, Event Manager, and a Website for a Coin Game - Computer Science and Software Engineering Foundation

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Vladislav, Team Lead / Software Engineer

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-Software Engineer with 7 years in the tech industry, with a robust computer science and software engineering background. - Strong knowledge of Vanilla PHP and JavaScript and front-end and back-end development skills. -Expertise spans prominent domains such as eCommercee& retail, Marketplace, Blockchain, Entertainment, Game dev, Social Network, Healthcare, Analytics, Education -Incorporated advanced technologies like Web3.js and Elasticsearch into projects, demonstrating a balance of front-end and back-end skills. -Capabilities extend beyond app architecture, database design, and optimization with MySQL and other databases. -Proven track record of leveraging Docker and Nginx for DevOps, underpinned by a solid grasp of Git. -Has effectively fulfilled the role of Team Lead, showcasing skills in mentorship, code review, and workflow optimization.

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Eldar K., PHP Software Engineer (Symfony, Laravel, Yii)

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Last Updated: 4 Jul 2023

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Table of Contents

How and where is PHPUnit used?

Case NameCase Description
Test-Driven Development (TDD)PHPUnit allows developers to practice Test-Driven Development (TDD), which involves writing tests before writing the actual code. TDD helps ensure that the code meets the specified requirements and avoids introducing bugs during development. By writing tests first, developers can focus on designing and implementing code that passes those tests, resulting in more reliable and maintainable software.
Regression TestingPHPUnit facilitates regression testing, which involves re-running tests on previously working functionality whenever changes are made to the codebase. This ensures that modifications or additions to the code do not introduce any unintended side effects or break existing functionality. By automatically running a suite of tests, developers can quickly identify and fix any issues that arise as a result of code changes.
Integration TestingPHPUnit enables developers to perform integration testing, which involves testing the interactions between different components or modules of a software system. This ensures that the integrated components work together correctly and produce the expected results. Integration testing helps identify any compatibility issues or communication problems between different parts of the system.
Code Coverage AnalysisPHPUnit provides code coverage analysis, which measures the extent to which the code is executed during the testing process. This metric helps developers identify areas of the code that are not adequately covered by tests. By analyzing code coverage, developers can ensure that all critical paths and branches of the code are tested, improving the overall quality and reliability of the software.
Continuous Integration (CI)PHPUnit integrates seamlessly with various CI tools, such as Jenkins, Travis CI, and GitLab CI/CD. This allows developers to automate the execution of test suites whenever changes are pushed to the code repository. Continuous integration ensures that the codebase remains stable and functional by running tests in a controlled and consistent environment.
Mocking and StubbingPHPUnit provides powerful mocking and stubbing capabilities, allowing developers to simulate and control the behavior of dependencies or external systems during testing. This is particularly useful when testing code that relies on external services, databases, or APIs. Mocking and stubbing help isolate the code under test, making it easier to identify and fix issues without relying on complex external setups.

Pros & cons of PHPUnit

6 Pros of PHPUnit

  • PHPUnit is the de facto standard for unit testing in PHP. It provides a comprehensive and robust framework for writing and executing tests.
  • PHPUnit has extensive documentation and a large community of developers who actively contribute to its development and provide support.
  • PHPUnit offers a wide range of assertions and test case classes, allowing developers to easily write test cases for different scenarios.
  • PHPUnit integrates seamlessly with popular PHP frameworks, such as Laravel and Symfony, making it easy to incorporate unit testing into existing projects.
  • PHPUnit supports test-driven development (TDD) and continuous integration (CI) practices, helping developers catch bugs early in the development cycle and ensure code quality.
  • PHPUnit provides code coverage reports, enabling developers to identify areas of their codebase that are not adequately covered by tests.

6 Cons of PHPUnit

  • PHPUnit can be complex for beginners and requires a solid understanding of unit testing concepts and PHP programming.
  • Writing comprehensive test cases can be time-consuming and may require significant effort, especially for large codebases.
  • Running tests in PHPUnit can be slow, especially when dealing with a large number of tests or complex test cases.
  • PHPUnit does not provide built-in support for testing asynchronous code, which may be a limitation for certain projects.
  • Some developers find the syntax and structure of PHPUnit test cases to be verbose and cumbersome.
  • Integration testing, which involves testing the interaction between different components of an application, is not the main focus of PHPUnit, and other tools may be more suitable for this purpose.

Let’s consider Difference between Junior, Middle, Senior, Expert/Team Lead developer roles.

Seniority NameYears of experienceResponsibilities and activitiesAverage salary (USD/year)
Junior0-2 yearsAssist in basic development tasks under the guidance of senior developers. Debugging, code maintenance, and documentation.$50,000 – $70,000
Middle2-5 yearsDevelop and implement software solutions independently. Collaborate with team members, contribute to project planning, and assist in mentoring junior developers.$70,000 – $90,000
Senior5-10 yearsLead complex software development projects, design and architect solutions, provide technical guidance to the team, and actively participate in code reviews and quality assurance.$90,000 – $120,000
Expert/Team Lead10+ yearsLead and manage a team of developers, set technical direction, oversee project delivery, collaborate with stakeholders, and contribute to strategic decision-making. Responsible for mentoring, code optimization, and ensuring high-quality deliverables.$120,000 – $150,000+

TOP 10 PHPUnit Related Technologies

  • PHP

    PHP is a popular server-side scripting language widely used for web development. It offers a wide range of features and frameworks that make it ideal for building robust and scalable applications.

  • PHPUnit

    PHPUnit is a unit testing framework for PHP. It provides a simple and efficient way to write tests for your PHP code, ensuring that it behaves as expected and doesn’t introduce any bugs or errors.

  • JavaScript

    JavaScript is a versatile programming language commonly used for client-side web development. It enables dynamic and interactive features on websites, making it an essential technology for modern web applications.

  • React

    React is a popular JavaScript library for building user interfaces. It allows developers to create reusable UI components and efficiently update them when the underlying data changes. React is widely adopted and has a large and active community.

  • Laravel

    Laravel is a PHP web application framework known for its elegant syntax and developer-friendly features. It provides a solid foundation for building scalable and maintainable web applications, making it a preferred choice for many PHP developers.

  • Vue.js

    Vue.js is a progressive JavaScript framework for building user interfaces. It focuses on simplicity and flexibility, allowing developers to incrementally adopt its features in existing projects. Vue.js has gained popularity due to its ease of use and excellent performance.

  • MySQL

    MySQL is an open-source relational database management system widely used in web development. It offers high performance, scalability, and robustness, making it a popular choice for storing and retrieving data in PHP applications.

Cases when PHPUnit does not work

  1. PHPUnit does not work when there is an issue with the PHPUnit installation. This can happen if the installation process was not completed successfully or if there are conflicts with other dependencies.
  2. PHPUnit may fail to work if the test code contains syntax errors or if the test cases are not written correctly. This can lead to PHPUnit being unable to execute the tests.
  3. PHPUnit may not work if the test environment is not properly set up. This includes issues with the configuration files, such as incorrect paths or missing required settings.
  4. PHPUnit may not function correctly if there are conflicts or compatibility issues with other libraries or frameworks used in the project. This can result in unexpected behavior or errors when running tests.
  5. PHPUnit may not work if there are issues with the code being tested. For example, if the code contains bugs or if there are issues with the dependencies used by the code, PHPUnit may not be able to successfully run the tests.
  6. PHPUnit may not work if there are issues with the test data or test fixtures. This can include missing or incorrect data, which can cause the tests to fail or produce unexpected results.
  7. PHPUnit may not work if there are issues with the test environment, such as insufficient resources or conflicts with other processes running on the system. These issues can impact the performance and reliability of PHPUnit.
  8. PHPUnit may not work if there are issues with the version compatibility between PHPUnit and the PHP runtime environment. It is important to ensure that the correct version of PHPUnit is being used for the specific PHP version.

TOP 11 Facts about PHPUnit

  • PHPUnit is a popular unit testing framework for the PHP programming language.
  • It was created by Sebastian Bergmann and it is part of the larger PHPUnit testing framework.
  • PHPUnit allows developers to write and execute unit tests to ensure the correctness of their PHP code.
  • It supports various types of tests, including unit tests, integration tests, and functional tests.
  • PHPUnit provides a rich set of assertions to validate the expected behavior of code under test.
  • It integrates well with popular PHP development tools and frameworks, such as Composer, Laravel, and Symfony.
  • PHPUnit is actively maintained and regularly updated to support the latest versions of PHP and to fix bugs and security vulnerabilities.
  • It has a large and active community of developers who contribute to its development and provide support to fellow users.
  • PHPUnit supports various code coverage analysis tools, allowing developers to measure the effectiveness of their tests.
  • It can be easily integrated into Continuous Integration (CI) and Continuous Delivery (CD) pipelines to automate the testing process.
  • PHPUnit is extensively documented, providing comprehensive guides and examples to help developers get started with unit testing in PHP.

What are top PHPUnit instruments and tools?

  • PHPUnit: PHPUnit is the most popular and widely used testing framework for PHP. It was created by Sebastian Bergmann in 2004 and has been actively maintained and updated since then. PHPUnit provides a comprehensive set of features for writing and running unit tests, allowing developers to ensure the quality and correctness of their PHP code. It supports various testing techniques such as test-driven development (TDD) and behavior-driven development (BDD), and integrates seamlessly with popular PHP development tools and frameworks. PHPUnit is widely adopted in the PHP community and is considered the de facto standard for PHP testing.
  • Codeception: Codeception is a versatile testing framework that extends PHPUnit and provides additional features to simplify and enhance the testing process. It supports multiple testing styles, including unit testing, functional testing, and acceptance testing. Codeception allows developers to write tests using a human-readable syntax, making it easier to understand and maintain test code. It also includes built-in support for testing web applications, RESTful APIs, and even command-line applications. Codeception is known for its intuitive and user-friendly interface, making it a popular choice among PHP developers.
  • Mockery: Mockery is a powerful mocking framework for PHP unit testing. It allows developers to easily create mock objects and define their behavior during testing. Mockery helps in isolating code under test by replacing dependencies with mock objects, enabling developers to focus on testing specific functionality without worrying about external dependencies. Mockery provides a clean and expressive syntax for defining mock objects and expectations, making it a preferred choice for developers who follow the mockist testing style. It integrates seamlessly with PHPUnit and other testing frameworks, making it a valuable tool for writing effective unit tests.
  • Behat: Behat is a behavior-driven development (BDD) framework for PHP that promotes collaboration between developers, testers, and stakeholders. It allows developers to write tests in a human-readable and domain-specific language called Gherkin. Behat tests are written in a narrative format that describes the expected behavior of the application in plain English. This makes it easier for non-technical stakeholders to understand and validate the application’s behavior. Behat integrates with PHPUnit and other testing frameworks, enabling developers to combine unit testing and behavior-driven testing in their workflow. It is widely used in agile development methodologies and is known for its focus on communication and collaboration.
  • ParaTest: ParaTest is a parallel testing tool for PHPUnit that allows developers to run their tests concurrently, significantly reducing the overall testing time. It achieves parallelism by distributing the test execution across multiple processes, taking advantage of modern multi-core processors. ParaTest seamlessly integrates with PHPUnit and provides a simple command-line interface for running tests in parallel. It automatically detects the available resources and optimizes the test execution for maximum efficiency. ParaTest is especially useful for projects with large test suites, where running tests sequentially can be time-consuming. It has gained popularity among PHP developers looking to speed up their test runs.
  • PhantomJS: PhantomJS is a headless web browser that can be used for functional testing of web applications. It allows developers to simulate user interactions and capture screenshots of web pages during testing. PhantomJS provides a JavaScript API that can be used to automate browser actions and perform assertions on the rendered web pages. It is often used in combination with testing frameworks like PHPUnit or Codeception to write functional tests for web applications. PhantomJS is known for its speed and compatibility with various web technologies, making it a valuable tool for testing web applications.

TOP 11 Tech facts and history of creation and versions about PHPUnit Development

  • PHPUnit is a unit testing framework for PHP code, created in 2001 by Sebastian Bergmann. It follows the xUnit architecture and is widely used in PHP development.
  • PHPUnit was inspired by JUnit, the Java unit testing framework, and was developed to bring the benefits of unit testing to PHP developers.
  • The first version of PHPUnit, 1.0, was released in 2004. It provided a simple and effective way to write and run tests for PHP code.
  • PHPUnit introduced the concept of test-driven development (TDD) to the PHP community. TDD involves writing tests before implementing the actual code, which helps in designing clean and maintainable code.
  • One of the groundbreaking features of PHPUnit is its ability to perform code coverage analysis. It can generate reports that show which parts of the code are covered by tests, helping developers identify areas that need more testing.
  • In 2009, PHPUnit 3.4 introduced data providers, allowing developers to provide multiple sets of input data to a single test method, reducing code duplication and making tests more readable.
  • PHPUnit has evolved over the years, adding new features and improving performance. The latest stable version, PHPUnit 9.5, was released in 2021.
  • PHPUnit integrates with popular development tools like PhpStorm, Eclipse, and Visual Studio Code, providing a seamless testing experience for developers.
  • PHPUnit supports various types of tests, including unit tests, integration tests, and functional tests, making it versatile for different testing scenarios.
  • PHPUnit has a large and active community of developers who contribute to its development and provide support through forums and online resources.
  • PHPUnit has become the de facto standard for unit testing in the PHP ecosystem, used by thousands of developers worldwide to ensure the quality and reliability of their PHP code.

Soft skills of a PHPUnit Developer

Soft skills are essential for a PHPUnit Developer as they contribute to their overall effectiveness and success in their role. These skills complement their technical expertise and enable them to collaborate, communicate, and problem-solve effectively.


  • Attention to Detail: Junior PHPUnit Developers should pay close attention to detail to ensure accurate and reliable test results.
  • Time Management: They should be able to manage their time effectively and prioritize tasks to meet project deadlines.
  • Adaptability: Being adaptable allows them to quickly adjust to changing requirements and work effectively in dynamic environments.
  • Teamwork: Junior developers should be able to collaborate and work well with others to achieve common goals and deliver high-quality code.
  • Problem-solving: They should possess problem-solving skills to identify and resolve issues that arise during testing and debugging.


  • Leadership: Middle-level PHPUnit Developers should have some leadership qualities to guide and mentor junior developers.
  • Communication: Effective communication skills are vital for middle-level developers to convey ideas, provide feedback, and collaborate with team members.
  • Critical Thinking: They should be able to think critically and analyze complex problems to develop innovative testing strategies.
  • Collaboration: Middle-level developers should excel in collaborating with cross-functional teams and stakeholders to ensure comprehensive testing.
  • Conflict Resolution: Having the ability to resolve conflicts and handle disagreements professionally is important for maintaining a harmonious work environment.
  • Quality Assurance: They should have a strong understanding of quality assurance principles and practices to ensure high-quality code.
  • Documentation: Good documentation skills are crucial for middle-level developers to document test cases, processes, and results accurately.


  • Mentorship: Senior PHPUnit Developers should be able to mentor and guide junior and middle-level developers in best practices and industry standards.
  • Strategic Thinking: They should possess the ability to think strategically and plan testing approaches that align with project goals and objectives.
  • Project Management: Senior developers should have project management skills to effectively plan, coordinate, and execute testing activities.
  • Continuous Learning: Staying updated with the latest trends and advancements in PHPUnit and software testing is crucial for senior developers.
  • Technical Leadership: They should provide technical leadership and guidance to the team, ensuring code quality and adherence to best practices.
  • Client Management: Senior developers should have strong client management skills to understand client requirements and communicate effectively.
  • Decision-making: They should be able to make informed decisions regarding testing strategies, frameworks, and tools.
  • Innovation: Senior developers should foster a culture of innovation by encouraging new ideas and approaches to improve testing processes.

Expert/Team Lead

  • Strategic Planning: Expert PHPUnit Developers should be adept at strategic planning to align testing efforts with long-term business objectives.
  • Team Leadership: They should have strong team leadership skills to manage and motivate a team of developers.
  • Project Coordination: Expert developers should excel in coordinating testing efforts across multiple projects and teams.
  • Business Acumen: They should possess a deep understanding of the business domain and industry trends to provide valuable insights.
  • Client Relationship Management: Expert developers should establish and maintain strong relationships with clients, ensuring their satisfaction.
  • Process Improvement: They should continuously evaluate and improve testing processes to increase efficiency and effectiveness.
  • Conflict Management: Expert developers should have advanced conflict management skills to handle complex disputes and maintain team harmony.
  • Strategic Partnerships: They should build strategic partnerships with stakeholders and other teams to drive collaboration and innovation.
  • Technical Expertise: Expert developers should have an exceptional level of technical expertise in PHPUnit and software testing.
  • Thought Leadership: They should be recognized as thought leaders in the industry, sharing knowledge and insights through conferences, blogs, etc.
  • Decision-making: Expert developers should have excellent decision-making skills, considering various factors and potential impacts.

Hard skills of a PHPUnit Developer

PHPUnit is a robust testing framework for PHP applications, and a skilled PHPUnit Developer possesses a range of hard skills to effectively utilize this tool in software development projects.


  • Test Case Creation: Ability to create test cases using PHPUnit to ensure proper functionality and identify bugs.
  • Test Execution: Proficiency in executing PHPUnit tests to validate the behavior of PHP code.
  • Test Assertions: Knowledge of different assertion methods provided by PHPUnit to verify expected outcomes.
  • Test Coverage: Understanding of code coverage concepts and the ability to measure test coverage using PHPUnit.
  • Test Fixtures: Familiarity with creating and managing test fixtures to set up the necessary environment for testing.


  • Test Doubles: Proficiency in using PHPUnit’s test doubles (e.g., mocks, stubs, and fakes) to isolate dependencies and facilitate testing.
  • Data Providers: Ability to use PHPUnit’s data providers to run tests with different input datasets.
  • Test Suites: Experience in creating and managing test suites to organize and run multiple test cases together.
  • Test Dependencies: Understanding of managing test dependencies and ensuring proper execution order of test cases.
  • Test Result Analysis: Skill in analyzing PHPUnit test results to identify failures, errors, and performance issues.
  • Test Fixtures Management: Capability to efficiently manage test fixtures, including setup and teardown operations.
  • Testing Best Practices: Knowledge of industry best practices for writing effective and maintainable PHPUnit tests.


  • Test Driven Development (TDD): Proficiency in applying TDD principles using PHPUnit to drive the development process.
  • Continuous Integration: Experience in integrating PHPUnit tests into CI/CD pipelines for automated testing.
  • Code Profiling: Knowledge of using PHPUnit’s code profiling capabilities to identify performance bottlenecks.
  • Test Reporting: Ability to generate comprehensive test reports with PHPUnit and interpret the results.
  • Test Maintenance: Skill in maintaining and updating existing PHPUnit test suites as code changes and evolves.
  • Code Review: Capability to review PHPUnit tests written by other team members for quality and adherence to standards.
  • Test Optimization: Expertise in optimizing PHPUnit tests for improved execution speed and efficiency.
  • Testing Framework Customization: Understanding of customizing PHPUnit’s behavior and extending its functionality.

Expert/Team Lead

  • Test Strategy Development: Ability to develop comprehensive testing strategies using PHPUnit for complex software systems.
  • Test Planning and Estimation: Proficiency in planning and estimating testing efforts for projects involving PHPUnit.
  • Test Automation Architecture: Knowledge of designing and implementing scalable and maintainable test automation frameworks using PHPUnit.
  • Test Environment Management: Experience in setting up and managing test environments for PHPUnit testing.
  • Testing Standards and Compliance: Understanding of industry testing standards and compliance requirements and ensuring adherence through PHPUnit.
  • Mentoring and Leadership: Capability to mentor junior developers and lead a team of PHPUnit developers in delivering high-quality software.
  • Test Driven Development (TDD) Advocacy: Expertise in promoting and advocating TDD practices within the organization.
  • Testing Process Improvement: Skill in identifying areas of improvement in the testing process and implementing enhancements using PHPUnit.
  • Test Documentation: Proficiency in documenting test cases, test plans, and test strategies using appropriate documentation tools.
  • Test Automation Framework Evaluation: Knowledge of evaluating and selecting test automation frameworks for PHPUnit-based testing.
  • Testing Tool Integration: Understanding of integrating PHPUnit with other testing tools and frameworks for comprehensive testing coverage.

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