Extension Sample API Tests (The GNU Awk User’s Guide)
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Gawk/docs/latest/Extension-Sample-API-Tests
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17.7.12 API Tests
The testext extension exercises parts of the extension API that are not tested by the other samples. The extension/testext.c file contains both the C code for the extension and awk test code inside C comments that run the tests. The testing framework extracts the awk code and runs the tests. See the source file for more information.
