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Diffblue is a developer of automated testing software that enhances Java development by automatically generating unit tests. The company is a spin-out of the AI research group at Oxford. Its automated code-writing capability has far-reaching potential and will eventually transform how software is written. Initially, Diffblue’s technology was deployed to save developers time and ensure robustness in one of software development's most tedious and time-consuming areas: writing unit tests. Diffblue's product stands out from code suggestion tools in that it works completely autonomously, using reinforcement learning to write fully formed tests that are guaranteed to compile, run, and find bugs.