SOLID Principles Online Test

The SOLID Principles Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

• Understanding and applying the Open Closed Principle
• Designing interfaces based on the Interface Segregation Principle
• Implementing dependency inversion in software design
• Developing code following the Single Responsibility Principle
• Ensuring adherence to the Liskov Substitution Principle
• Utilizing Inversion of Control in software architecture
• Identifying violations of the Single Responsibility Principle
• Establishing high cohesion and encapsulation in code
• Implementing testability and maintainability in software
• Applying SOLID principles to optimize software design

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

• Open Closed Principle (OCP)

  The Open Closed Principle (OCP) states that software entities (classes, modules, functions, etc.) should be open for extension, but closed for modification. This means that new functionality can be added without changing the existing code, making the software more maintainable and robust.

• Interface Segregation Principle (ISP)

  The Interface Segregation Principle (ISP) states that clients should not be forced to depend on interfaces they do not use. By creating smaller, cohesive interfaces, this principle helps to prevent a class from implementing unnecessary methods, reducing complexity and improving code readability.

• Dependency Inversion Principle (DIP)

  The Dependency Inversion Principle (DIP) states that high-level modules should not depend on low-level modules. Instead, both should depend on abstractions. By using interfaces or abstract classes to define the dependencies, this principle promotes loose coupling, making the code more flexible, testable, and easier to maintain.

• Single Responsibility Principle (SRP)

  The Single Responsibility Principle (SRP) states that a class should have only one reason to change. By separating concerns and assigning each class a single responsibility, this principle improves code organization, readability, and maintainability.

• Liskov Substitution Principle (LSP)

  The Liskov Substitution Principle (LSP) states that objects of a superclass should be replaceable with objects of its subclasses, without affecting the correctness of the program. This principle ensures that inheritance is used correctly, avoiding unexpected behavior and allowing the code to be extended without breaking existing functionality.

• Inversion of Control

  Inversion of Control (IoC) is a design principle that refers to the external control of an object's lifecycle, rather than the object itself managing its dependencies and resources. This principle enables loose coupling, promotes modularity, and simplifies testing and maintenance.

• Violation in SRP

  A violation of the Single Responsibility Principle (SRP) occurs when a class has multiple responsibilities, making it difficult to understand, maintain, and reuse. This measurement helps identify classes that may require refactoring to adhere to the principle, improving code quality and reducing complexity.

• Cohesion and Encapsulation

  Cohesion refers to the degree to which the elements of a module or class are related to each other. Encapsulation refers to the bundling of related data and behavior into a single entity, such as a class. Measuring cohesion and encapsulation helps assess the design and organization of the code, ensuring high cohesion and strong encapsulation for better maintainability and extensibility.

• Full list of covered topics

  The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for SOLID Principles Test to be based on.

  OCP

  Interface Segregation

  Dependency Inversion

  Single Responsibility

  Liskov Substitution

  Inversion of Control

  SRP Violation

  Cohesion

  Encapsulation

• Software Developer
• Software Engineer
• Full Stack Developer
• Front-end Developer
• Back-end Developer

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

• Facilitating reusable and modular code development
• Creating flexible and extensible software architectures
• Managing dependencies and abstractions in code
• Utilizing abstraction layers in software components
• Designing systems with low coupling and high cohesion
• Applying design patterns to solve software design problems
• Implementing separation of concerns in software modules
• Refactoring code to improve SOLID principle adherence
• Identifying and resolving code smells and anti-patterns
• Ensuring code flexibility and scalability in software