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And so, you write this test that checks the behavior of just this small part so that when you compose the parts together, you can rely on them.ĬRAIG: And something called test led development, it seems from talking to people that very few people really do test led development. PETER: And it tests a unit of code, which is generally defined as the smallest part that you can reasonably test, think of a clause in Java or a couple of clauses that interact with each other.
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PETER: So, unit tests are tests that are written while the software is developed before or during the development or slightly afterwards, depending on the methodology that is used. And unit tests, most of the audience we’re speaking to would understand unit tests, but can you explain what a unit test is and traditionally how it's created.
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PETER: And the key idea was to change the way software is developed by increasing the level of automation to free up developers from chores like writing unit tests that machines can supposedly do much better, so that developers then can focus on more difficult and creative tasks in software development.ĬRAIG: Yeah. So, this was the idea when we founded Diffblue with Professor Daniel Kroening from Oxford to apply this and essentially bring expertise in program analysis to a larger audience of developers. And then you get the inputs and can construct a test that executes the program.ĬRAIG: and then you've applied this to automatic unit test generation.
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For example, you can ask the system, what are the inputs that you need to feed in the program so that a certain branch in the code gets executed. And these techniques can also be used for automatically generating test cases. PETER: This machine based logical reasoning is one of the oldest areas of artificial intelligence. And this is known as model checking and at a lower level, these techniques are based on solving logical constraints. PETER: And then we are able to check whether C program satisfies certain specified properties.
And this is based on a formalized semantics of the programming language. And then when I came as a research assistant to Oxford in the United Kingdom, I worked on techniques for software verification, programs written in C, so still low-level code. So, think nuclear power plants or airplanes and stuff like that, automated tools around it are also used in hardware development and increasingly also for operating systems, to make sure that they're secure, don't crash and so on. This is mainly used for safety critical systems. And then constructing an implementation that is mathematically proven. PETER: And there, I worked in the area of formal methods for system design, rigorously specifying the behavior of a system.
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So, I started a PhD in systems verification at Inria in Grenoble in France. So, there must be better ways of doing that. PETER: And the one thing that I noticed back then is that gaining confidence in the correctness of complex systems is really difficult. So, I worked from the firmware up to system integrations. I started my career at Siemens working on R F I D systems, radio frequency identification. PETER: So, I studied in Vienna, at the TU, in Austria, in computer science. And then we'll talk about automated code generation and unit testing and all of those cool things. I hope you find the conversation as interesting as I did.ĬRAIG: Peter, introduce yourself, give some background on your education and your particular area of study. Tell them Eye on AI sent you.ĬRAIG: Now here's Peter. Let's take a moment to thank our sponsor ClearML, an open-source ML ops solution. Peter spoke about the increasing automatic generation of code and how he sees such automation increasing the productivity of developers.ĬRAIG: Before we begin.
I speak to Peter Schrammel, one of the founders of Diffblue, an automated unit-test writing software company. This transcript may contain errors.ĬRAIG: Hi, I'm Craig Smith. Shrammel.mp3: this mp3 audio file was automatically transcribed by Sonix with the best speech-to-text algorithms. Shrammel.mp3: Audio automatically transcribed by Sonix
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