Testing / Apache JMeter Interview questions
How do JMeter Assertions differ from Post-Processors?
An Assertion evaluates a sampler's response against an expected condition and marks the sample as pass or fail based on that check - its job is purely to judge correctness, not to produce any new data for later use.
A Post-Processor, by contrast, typically extracts or transforms data from the response - like pulling a session token out with a Regular Expression Extractor - producing a variable that other elements later in the test can actually use, rather than judging pass/fail on the current sample.
Both attach to a sampler and run after it completes, and a single sampler can have both an assertion and a post-processor attached simultaneously, since checking correctness and extracting data for later use are two independent, complementary jobs rather than alternatives to each other.
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