Separate Source and Test Input Checksums for Enhanced Build Incrementality

[maximiln]

New feature, improvement proposal

Problem Statement

Currently, the build cache treats all project inputs (sources and tests) as a single unit when calculating cache keys. When test files are modified, the entire module is considered changed and must be rebuilt, including recompilation of production source code. This results in suboptimal cache utilization and increased build times.

Solution Approach

Implement separate checksum calculation for:

• Production source inputs: Main source code, resources, and production dependencies
• Test inputs: Test source code, test resources, and test-specific dependencies