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Sketch is a popular program synthesis tool that solves for unknowns in a  sketch  or partial program. However, while Sketch is powerful, it does not directly support modular synthesis of dependencies, potentially limiting scalability. In this paper, we introduce Sketcham, a new technique that modularizes a regular sketch by automatically generating  mocks —functions that approximate the behavior of complete implementations—from the sketch’s test suite. For example, if the function  f  originally calls  g , Sketcham creates a mock    $$g_m$$  g m from  g ’s tests and augments the sketch with a version of  f  that calls    $$g_m$$  g m . This change allows the unknowns in  f  and  g  to be solved separately, enabling modular synthesis with no extra work from the Sketch user. We evaluated Sketcham on ten benchmarks, performing enough runs to show at a 95% confidence level that Sketcham improves median synthesis performance on six of our ten benchmarks by a factor of up to 5   $$\times $$  × compared to plain Sketch, including one benchmark that times out on Sketch, while exhibiting similar performance on the remaining four. Our results show that Sketcham can achieve modular synthesis by automatically generating mocks from tests.

Program Sketching by Automatically Generating Mocks from Tests