Fortunately, developers can write a fuzz test harness in much less time than required to write individual unit tests. Fuzzing extends this form of testing by parameterizing the test within an array of bytes and then searching for strings of input bytes that trigger bugs. Unit tests and integration tests both typically involve running the software under test with a specific input and asserting that a specific output was observed. In order to fuzz test, a fuzzer needs a way to interact with the application. A seed corpus is a set of valid inputs that serve as a starting point for fuzzing a target. These anomalous behaviors are often a sign of an underlying vulnerability. Their objective is to trigger bad behaviors, such as crashes, infinite loops, and/or memory leaks. Fuzzers send malformed inputs to targets.
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