# 32.5. Test Coverage Examination The PostgreSQL source code can be compiled with coverage testing instrumentation, so that it becomes possible to examine which parts of the code are covered by the regression tests or any other test suite that is run with the code. This is currently supported when compiling with GCC and requires the `gcov` and `lcov` programs. A typical workflow would look like this: ``` ./configure --enable-coverage ... OTHER OPTIONS ... make make check # or other test suite make coverage-html ``` Then point your HTML browser to `coverage/index.html`. The `make` commands also work in subdirectories. To reset the execution counts between test runs, run: ``` make coverage-clean ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.postgresql.tw/12/server-administration/regression-tests/32.5.-test-coverage-examination.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.