Java or Python Programming for Test Automation Questions
Strong programming skills in Java or Python with expertise in OOP principles (inheritance, polymorphism, encapsulation, abstraction), exception handling, collections, file I/O, and functional programming concepts. Ability to write clean, well-structured, maintainable code with appropriate design patterns. Understanding of common libraries and utilities for test automation.
EasyTechnical
92 practiced
Write a Python generator function tail_first_n(path, n) that yields the first n non-empty lines from a very large log file without loading the entire file into memory. Explain how you would write unit tests for it using small temporary files.
HardTechnical
79 practiced
Refactor code that calls time.time() directly so it accepts a time provider, enabling deterministic tests that simulate time progression. Provide before-and-after Python code and show unit tests that advance a fake clock to trigger timed behaviors without sleeping.
EasyTechnical
69 practiced
Write a Python generator function batch_file_lines(path, batch_size, shuffle=False, seed=None) that yields lists of lines with up to batch_size items, reading the file incrementally and avoiding loading it entirely into memory. If shuffle is True, ensure deterministic shuffling when seed is provided and explain strategies for large files.
EasyTechnical
66 practiced
Explain polymorphism in object-oriented programming with examples in both Python and Java. Describe how polymorphism improves testability in test automation code for AI systems. Include a short code example showing an interface or abstract class and two implementations that can be used interchangeably by a test harness.
HardSystem Design
87 practiced
Design a test automation component that orchestrates dataset versioning and deterministic sampling across unit and integration tests. Requirements: immutable dataset versions, reproducible sampling seeds, efficient storage of deltas, ability to pin datasets in CI, and APIs for retrieving specific versions. Provide architecture components and data flow.
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