test: test_bitcoin: allow -testdatadir=<datadir>

Specifying this argument overrides the path location for test_bitcoin;
it becomes <datadir>/test_common_Bitcoin Core/<testname>/datadir. Also,
this directory isn't removed after the test completes. This can make it
easier for developers to study the results of a test (see the state of
the data directory after the test runs), and also (for example) have an
editor open on debug.log to monitor it across multiple test runs instead
of having to re-open a different pathname each time.

Example usage (note the "--" is needed):

test_bitcoin --run_test=getarg_tests/boolarg -- \
-testdatadir=/somewhere/mydatadir

This will create (if necessary) and use the data directory:

/somewhere/mydatadir/test_common_Bitcoin Core/getarg_tests/boolarg/datadir

Co-authored-by: furszy <mfurszy@protonmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/bench/bench.cpp b/src/bench/bench.cpp
index 84b66bc4b2..a13a693ad7 100644
--- a/src/bench/bench.cpp
+++ b/src/bench/bench.cpp
@@ -23,6 +23,8 @@ const std::function<void(const std::string&)> G_TEST_LOG_FUN{};
 
 const std::function<std::vector<const char*>()> G_TEST_COMMAND_LINE_ARGUMENTS{};
 
+const std::function<std::string()> G_TEST_GET_FULL_NAME{};
+
 namespace {
 
 void GenerateTemplateResults(const std::vector<ankerl::nanobench::Result>& benchmarkResults, const fs::path& file, const char* tpl)