Regression test
===============

:unified-context-diff: https://en.wikipedia.org/wiki/Diff#Unified_format

Source structure
----------------

----------------------------------------------
.
├── unit
│   └── …
└── compose
    └── …
        ├── cmd          → command
        ├── [in]         → start file
        ├── [out]        → end file
        ├── [selections] → selection contents
        ├── [state]      → selection states
        └── [rc]         → configuration
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Usage
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To test, just type +run [test]+ in the +test+ directory.
It will print each passing test.  If a test fails, a {unified-context-diff}[unified context diff]
is printed showing the test’s expected output and the actual output.