Mockolo: Efficient Mock Generator for Swift
summary
Builds a fast Swift mock generator that parses with SourceKitten, limits concurrency with a dispatch semaphore to core count, and uses simple string interpolation templates instead of Stencil. Targets a 2M-line codebase with ~11,000 protocols, needing ~9,000 mocks (~0.5M generated lines); existing tools took ~1 hour, the new tool runs ~5s multi‑threaded (about +12s single‑threaded). Resolves inheritance by precomputing dependency outputs, generates models lazily, supplies default return values, and integrates into the build system.
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chapters (11)
- 0:00Introduction
- 0:45What is Mockolo
- 13:03Resolving Inheritance
- 16:52Rendering
- 20:42Profiling
- 23:18Recap
- 25:13Issue with SourceKit
- 27:02Benchmarking
- 30:20Apples priorities
- 31:37Compile time
- 32:52Swift syntax
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