The disclosure generally describes methods, software, and systems for generating code using test cases. A plurality of test cases is received for a new software component to be coded. Software components in a software component repository are identified, including determining software components having a similarity to the new software component to identify similar software components. For each of the similar software components, the received plurality of test cases is executed to generate results. The generated results are compared to expected outputs of the plurality of test cases to identify an existing software component adaptable to match the expected outputs. The new software component is created from the existing software component matching the expected outputs.