Property-based testing (PBT) is an advanced testing methodology that evaluates code by using a variety of randomly generated inputs, allowing developers to make general assertions about code behavior rather than relying on specific test cases. This approach is particularly beneficial when testing against a known correct function, but it becomes more abstract when a reference implementation is absent, requiring developers to define the properties of their code. The tutorial provides a practical guide to implementing PBT in Rust using the proptest crate, illustrating how to construct various strategies to generate test inputs and validate code behavior. By using a parser as an example, the tutorial demonstrates how to define grammar rules with the pest crate, create strategies to generate valid and invalid inputs, and employ proptest macros to conduct thorough testing. The tutorial emphasizes that while PBT is not a one-size-fits-all solution, it encourages a deeper understanding of code properties, which can lead to more robust and reliable software.