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SOLID Principles Online Test

About the test:

The Solid Principles Test uses scenario-based multiple choice questions to evaluate candidates on their understanding of the SOLID design principles for object-oriented software development. The test assesses candidates' proficiency in applying SOLID principles to write maintainable, extensible, and testable code, including topics such as single responsibility principle (SRP), open-closed principle (OCP), Liskov substitution principle (LSP), interface segregation principle (ISP), dependency inversion principle (DIP), and the SOLID design patterns.

Covered skills:

  • Open Closed Principle (OCP)
  • Dependency Inversion Principle (DIP)
  • Liskov Substitution Principle (LSP)
  • Violation in SRP
  • Interface Segregation Principle (ISP)
  • Single Responsibility Principle (SRP)
  • Inversion of Control
  • Cohesion and Encapsulation

9 reasons why
9 reasons why

Adaface SOLID Principles Test is the most accurate way to shortlist Software Developers

Reason #1

Tests for on-the-job skills

The SOLID Principles Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

  • Understanding and applying the Open Closed Principle (OCP)
  • Implementing interfaces to adhere to the Interface Segregation Principle (ISP)
  • Applying the Dependency Inversion Principle (DIP) to decouple components
  • Designing classes and modules with a single responsibility, following the Single Responsibility Principle (SRP)
  • Ensuring proper inheritance and substitutability with the Liskov Substitution Principle (LSP)
  • Utilizing Inversion of Control (IoC) containers for managing object dependencies
  • Identifying and resolving violations of the Single Responsibility Principle (SRP)
  • Ensuring high cohesion and encapsulation in code design
Reason #2

No trick questions

no trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

View sample questions

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface
Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

How we design questions

These are just a small sample from our library of 10,000+ questions. The actual questions on this SOLID Principles Test will be non-googleable.

🧐 Question


Paint says Bye!
Which SOLID principle is followed by the given code snippet?
🧐 QuestionπŸ”§ Skill


Paint says Bye!

2 mins

🧐 QuestionπŸ”§ SkillπŸ’ͺ DifficultyβŒ› Time
Paint says Bye!
Easy2 mins
Reason #4

1200+ customers in 75 countries

customers in 75 countries

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment SOLID Principles Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Science behind Adaface tests
Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the SOLID Principles Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

invite candidates
Reason #7

Detailed scorecards & benchmarks

View sample scorecard
Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

test completion rate
Reason #9

Advanced Proctoring

Learn more

About the SOLID Principles Assessment Test

Why you should use Pre-employment 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.

What topics are covered in the SOLID Principles Online Test?

  • 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.

    Interface Segregation
    Dependency Inversion
    Single Responsibility
    Liskov Substitution
    Inversion of Control
    SRP Violation

What roles can I use the SOLID Principles Online Test for?

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

How is the SOLID Principles Online Test customized for senior candidates?

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
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The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.

reduction in screening time

SOLID Principles Hiring Test FAQs

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify. Here's a quick guide on how you can request a custom test.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

  • Non-googleable questions
  • IP proctoring
  • Screen proctoring
  • Web proctoring
  • Webcam proctoring
  • Plagiarism detection
  • Secure browser
  • Copy paste protection

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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40 min tests.
No trick questions.
Accurate shortlisting.
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