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SOLID Principles Test: Assess candidates' understanding of SOLID Design Principles

The SOLID Principles Test combines hands-on coding and multiple-choice questions to evaluate candidates' understanding of the principles of SOLID design in object-oriented software development. It evaluates applicants' ability to implement these principles in writing extensible, maintainable, and testable code. The test assesses their understanding of topics such as the single-responsibility principle (SRP), the Liskov Substitution Principle (LSP), identifying violations in SRP, knowledge of dependency injection and its types, and more. 

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Inside this SOLID Principles Test

The SOLID Principles Test is a pre-hiring assessment for efficiently evaluating candidates' proficiency in applying and utilizing SOLID design principles for object-oriented software development. The test includes a range of competencies, ensuring an in-depth evaluation of candidates' skills. Through a hands-on programming question, the test allows candidates to demonstrate their practical coding abilities. It aims to understand an individual's proficiency in translating SOLID principles into actual code, emphasizing clean, extensible, and maintainable solutions.

Most importantly, the test covers essential concepts to test applicants' understanding of the SOLID Design Principles, such as the single-responsibility principle (SRP), Liskov Substitution Principle (LSP), open-closed principle (OCP), interface segregation principle (ISP), and Dependency Inversion Principle (DIP).

Test-takers' competence in applying these principles and detecting instances where the single responsibility principle is violated is also evaluated during the test. Furthermore, the respondents are asked questions based on dependency injection and its various types to determine their understanding of flexible and decoupled code design. Therefore, by integrating these essential competencies into the test, the SOLID Principles Test evaluates candidates' ability to present robust and maintainable object-oriented software solutions.

Utilize the test to screen candidates for the following positions. 

  • Software engineer 
  • Senior software developer 
  • Senior software professional


On a particular occasion, Robert C. Martin, the man behind the SOLID principles, emphasized that software can become inflexible, viscous, rigid and fragile without sound design principles. The SOLID principles, the acronym's creation credited to Michael Feathers, were formulated to address and overcome these complex design patterns. Since then, adherence to these design principles has helped software engineers quickly prevent such issues and construct efficient, flexible, agile software.

SOLID principles offer a sturdy basis for creating highly performant software systems. Such development practices meet the requirements of businesses that demand adaptable and flexible systems to meet evolving market needs. Companies can significantly benefit from developers who can implement SOLID principles effectively, resulting in more refactorable, extendable, and manageable software, thus minimizing technical debt and improving productivity. Hiring software developers with expertise in SOLID principles becomes critical for such organizations.

Finding candidates with adequate experience and knowledge in identifying and resolving design issues can be challenging, as it mandates a person to possess theoretical understanding, coding prowess, and the ability to write clean and maintainable code. The SOLID Principles Test is an optimal solution to tackle this hiring challenge. The test is designed for recruiting managers to determine candidates' knowledge and application of SOLID principles, helping them identify the best talent. As a reliable measure of candidates' proficiency, the test is a helpful tool to screen and shortlist applicants based on their practical skills and theoretical knowledge of SOLID principles.


This SOLID Principles Test is a part of following Skills Libraries

SOLID Principles Assessment Competency Framework

Get a detailed look inside the test

SOLID Principles Test Competencies Under Scanner

SOLID Principles Test


Hands-on programming

The hands-on programming section includes coding questions to determine candidates' practical coding skills.

SOLID principles

This section covers the following competencies: implementing SOLID, SRP, LSP, OCP, ISP, DIP, violation in SRP, and dependency injection and its types.

Customize This SOLID Principles Test

Flexible customization options to suit your needs

Set difficulty level of test

Choose easy, medium or hard questions from our skill libraries to assess candidates of different experience levels.

Combine multiple skills into one test

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Add, edit or bulk upload your own coding questions, MCQ, whiteboarding questions & more.

Request a tailor-made test

Get a tailored assessment created with the help of our subject matter experts to ensure effective screening.

The Mercer | Mettl SOLID Principles Assessment Advantage

The Mercer | Mettl Edge
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  • Inbuilt Cutting Edge AI-Driven Proctoring
  • Simulators designed by developers
  • Tests Tailored to Your business needs
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SOLID Principles Test Can Be Setup in 4 Steps

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Step 3: Test View

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Step 4: Insightful Report

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Frequently Asked Questions (FAQs)

A SOLID Principles Test is an online pre-employment screening test that aims to determine respondents' knowledge, skills, and expertise in the SOLID design principles in object-oriented software development, ascertaining their skills in writing maintainable and scalable code. 

While the Mercer | Mettl SOLID Principles Test is intended for recruitment purposes, we can also perform benchmarking for custom sample sets. If you have a specific benchmarking requirement or any related questions, please contact us, and we will gladly help. 

We have experience customizing test reports to fulfill clients' unique specifications. Should you have a specific request, please let us know, and we will gladly assist you. 

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