test: Update test README and lint script

ci/lint/04_install.sh

@@ -13,7 +13,6 @@ update-alternatives --install /usr/bin/clang-format-diff clang-format-diff $(whi
 
 ${CI_RETRY_EXE} pip3 install codespell==2.0.0
 ${CI_RETRY_EXE} pip3 install flake8==3.8.3
-${CI_RETRY_EXE} pip3 install yq
 ${CI_RETRY_EXE} pip3 install mypy==0.781
 ${CI_RETRY_EXE} pip3 install vulture==2.3
 

doc/fuzzing.md

@@ -16,6 +16,9 @@ $ FUZZ=process_message src/test/fuzz/fuzz
 # abort fuzzing using ctrl-c
 ```
 
+There is also a runner script to execute all fuzz targets. Refer to
+`./test/fuzz/test_runner.py --help` for more details.
+
 ## Fuzzing harnesses and output
 
 [`process_message`](https://github.com/bitcoin/bitcoin/blob/master/src/test/fuzz/process_message.cpp) is a fuzzing harness for the [`ProcessMessage(...)` function (`net_processing`)](https://github.com/bitcoin/bitcoin/blob/master/src/net_processing.cpp). The available fuzzing harnesses are found in [`src/test/fuzz/`](https://github.com/bitcoin/bitcoin/tree/master/src/test/fuzz).

test/README.md

@@ -5,20 +5,24 @@ etc.
 
 This directory contains the following sets of tests:
 
+- [fuzz](/test/fuzz) A runner to execute all fuzz targets from
+  [/src/test/fuzz](/src/test/fuzz).
 - [functional](/test/functional) which test the functionality of
 bitcoind and bitcoin-qt by interacting with them through the RPC and P2P
 interfaces.
-- [util](/test/util) which tests the bitcoin utilities, currently only
-bitcoin-tx.
+- [util](/test/util) which tests the utilities (bitcoin-util, bitcoin-tx, ...).
 - [lint](/test/lint/) which perform various static analysis checks.
 
-The util tests are run as part of `make check` target. The functional
+The util tests are run as part of `make check` target. The fuzz tests, functional
 tests and lint scripts can be run as explained in the sections below.
 
 # Running tests locally
 
 Before tests can be run locally, Bitcoin Core must be built.  See the [building instructions](/doc#building) for help.
 
+## Fuzz tests
+
+See [/doc/fuzzing.md](/doc/fuzzing.md)
 
 ### Functional tests
 
@@ -269,7 +273,6 @@ Use the `-v` option for verbose output.
 | [`lint-python.sh`](lint/lint-python.sh) | [flake8](https://gitlab.com/pycqa/flake8) | [3.8.3](https://github.com/bitcoin/bitcoin/pull/19348) | `pip3 install flake8==3.8.3`
 | [`lint-python.sh`](lint/lint-python.sh) | [mypy](https://github.com/python/mypy) | [0.781](https://github.com/bitcoin/bitcoin/pull/19348) | `pip3 install mypy==0.781`
 | [`lint-shell.sh`](lint/lint-shell.sh) | [ShellCheck](https://github.com/koalaman/shellcheck) | [0.7.2](https://github.com/bitcoin/bitcoin/pull/21749) | [details...](https://github.com/koalaman/shellcheck#installing)
-| [`lint-shell.sh`](lint/lint-shell.sh) | [yq](https://github.com/kislyuk/yq) | default | `pip3 install yq`
 | [`lint-spelling.sh`](lint/lint-spelling.sh) | [codespell](https://github.com/codespell-project/codespell) | [2.0.0](https://github.com/bitcoin/bitcoin/pull/20817) | `pip3 install codespell==2.0.0`
 
 Please be aware that on Linux distributions all dependencies are usually available as packages, but could be outdated.