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Testing / Karate Framework Interview questions

What is Karate CLI?

Karate CLI is a single-binary command-line launcher for running Karate tests without requiring a Maven or Gradle project setup, aimed at teams or individuals who want to run .feature files directly, such as for quick exploratory testing, scripting, or non-Java environments.

karate tests/users.feature --tags @smoke

This lowers the barrier for people who aren't primarily Java developers, like manual QA testers or business analysts, to write and run Karate tests without first setting up a full Java build toolchain, while Java/Maven/Gradle projects can still use the Runner-based approach for deeper CI/CD integration.

Karate CLI is primarily useful for:
Karate CLI is especially helpful for:

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What is the Karate Framework? What is a Karate feature file? What is the purpose of the Given, When, Then keywords in Karate? What is the match keyword used for in Karate? What is the def keyword used for in Karate? What is a Background section in a Karate feature file? What is a Scenario Outline in Karate? What are Karate's built-in type markers, like #number and #string? What is karate-config.js used for? What are tags used for in Karate? What is the call keyword used for in Karate? What is Karate's assert keyword? What is the configure keyword used for in Karate? What are the main features of the Karate Framework? What is Karate's built-in mock server used for? What is Karate's UI automation driver used for? What is Karate-Gatling integration used for? What is the path keyword used for in Karate? What is the header keyword used for in Karate? What is Karate's embedded JavaScript engine, karate-js? What is the eval keyword in Karate? What is the retry until keyword used for? What is a Karate Runner class? What is Karate CLI? What is Karate Agent? Explain the execution flow of a Karate scenario from feature file to HTTP response? Why does Karate not require step definitions like traditional Cucumber? How does Karate differ from REST Assured for API testing? What is the difference between match == and match contains in Karate? How do you implement data-driven testing using Scenario Outline and Examples in Karate? When should you use callonce instead of call? How do you troubleshoot a failing match assertion in Karate? Why did Karate replace GraalJS with its own custom JS engine (karate-js)? How does Karate handle parallel test execution using virtual threads? Explain the internal working of the @lock tag for controlling parallel execution? What is the difference between Karate and Postman for API testing? How do you implement reusable authentication flows using call in Karate? Why use Karate for performance testing instead of a dedicated tool like JMeter alone? What is the difference between match contains and match contains only? How does Karate's mock server handle stateful request/response scenarios? When would you choose Karate's UI driver over a separate Selenium-based framework? How do you configure environment-specific settings using karate.env? What is the difference between Karate v1's @parallel=false and v2's @lock tag? Explain the internal working of Karate's CDP-based browser automation? How do you optimize a large Karate regression suite for faster execution? What is the difference between karate-config.js and a feature-level Background? How does the Karate Runner decide which features and tags to execute? Why should you use table-driven Examples instead of hardcoding multiple scenarios? What is the difference between path and param keywords in Karate? How do you troubleshoot flaky UI tests in Karate, and how does v2's automatic waiting help?
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