A team of developers is tasked with developing an enterprise application. They meet daily with stakeholders to discuss the state of the project. The developers and stakeholders have identified a set of functionalities to be implemented over the next two weeks. After some design work, coding begins. A new requirement is discovered, and developers and stakeholders agree to prioritize implementing a feature to address this newly discovered requirement. As developers complete small functional units of code, they test it. If the code passes the tests, the code unit is integrated with the version-controlled codebase. What application development methodology is this team using?