Black-box testing techniques in Software Engineering - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Understanding Equivalence Partitioning

Which of the following best describes the purpose of equivalence partitioning in black-box testing?

A To check the software's performance under heavy load

B To test the internal structure of the software by examining code paths

C To divide input data into groups that are expected to be treated the same by the software

D To verify the software's installation process

💡 Hint

Think about how testers reduce the number of test cases by grouping inputs.

Equivalence partitioning divides input data into classes where all inputs in a class are expected to be handled similarly by the software, reducing redundant tests.

📋 Factual

intermediate

Boundary Value Analysis Purpose

What is the main goal of boundary value analysis in black-box testing?

A To test the software's response to invalid input types

B To test values at the edges of input ranges where errors often occur

C To analyze the software's internal logic for errors

D To check the software's compatibility with different operating systems

💡 Hint

Consider where bugs are most likely to happen in input ranges.

Boundary value analysis focuses on testing inputs at the minimum, maximum, just inside, and just outside boundaries because errors often occur at these points.

🚀 Application

advanced

Applying Decision Table Testing

Given a system that approves loans based on two conditions: income level (high or low) and credit score (good or bad), which test case set correctly represents all possible combinations using decision table testing?

A High income & good credit, High income & bad credit, Low income & good credit, Low income & bad credit

B Income above threshold, Credit score above threshold

C Approve loan, Deny loan, Review loan, Escalate loan

D High income only, Low income only, Good credit only, Bad credit only

💡 Hint

Decision tables list all combinations of conditions to ensure coverage.

Decision table testing creates test cases for every possible combination of input conditions to verify correct system behavior for each.

🔍 Analysis

advanced

Cause-Effect Graphing Analysis

Which statement correctly explains the benefit of cause-effect graphing in black-box testing?

A It documents the internal code structure for developers

B It measures the software's speed under different network conditions

C It automates the generation of user interface layouts

D It helps identify logical relationships between inputs and outputs to design effective test cases

💡 Hint

Think about how cause-effect graphs relate inputs to outputs logically.

Cause-effect graphing visually maps input conditions (causes) to output actions (effects), helping testers create test cases that cover complex logical scenarios.

❓ Reasoning

expert

Choosing the Best Black-box Technique for Complex Input

A software accepts a complex input form with multiple fields, each having specific valid ranges and dependencies. Which black-box testing technique is most suitable to ensure thorough testing of all input combinations and their effects?

A Decision table testing, because it systematically covers all combinations of conditions and actions

B Boundary value analysis, because it tests only the edge values of each input field

C Equivalence partitioning, because it groups inputs into broad categories ignoring dependencies

D Random testing, because it selects inputs without any structured approach

💡 Hint

Consider which method handles multiple conditions and their interactions best.

Decision table testing is ideal for complex inputs with dependencies because it covers all possible combinations of conditions and their corresponding actions, ensuring no scenario is missed.