test: Move the fixture runners into evmone::testutils

[chfast]

Now that the runners no longer use gtest, they can live in evmone::testutils instead of in the
test binaries. statetest_runner.cpp moves unchanged; blockchaintest_runner.cpp only swaps its
own header for blockchaintest.hpp, where run_blockchain_tests() now sits next to
load_blockchain_tests() — that retires blockchaintest_runner.hpp. run_state_test() ends up
defined in the same target as the statetest.hpp declaration it implements. The point is the
build configuration: evmone::testutils is built by EVMONE_TOOLS alone, where GTest is never
fetched, so this is what lets the evmone CLI reach the runners later. Configuring with
EVMONE_TOOLS=ON, EVMONE_TESTING=OFF builds both runner objects into testutils with no mention of
GTest; before this commit that configuration had no runners at all.

The second commit takes what the move enables. The suites the coverage job runs, unit and
integration, reach little of the runners: blockchaintest_runner.cpp sat at 61% line coverage,
with validate_block()'s rejections and the state dumps never executed. EEST does reject blocks
on a green run, but it never reports a disagreement, so the verdicts below a rejection are
unreachable from it. evmone-unittests already links testutils, so five tests can now
drive both runners directly with fixtures broken on purpose, taking the two files to 75% and 96%
lines and the blockchain runner to 100% of functions. tx_invalid_nonce moves out of the
integration tests, where the remaining cases stay as end-to-end smoke; the unit version asserts on
the reported failure's fields rather than regex-matching a subprocess's output.

[codspeed-hq]

Merging this PR will not alter performance

✅ 129 untouched benchmarks

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_{Comparing test/runners-in-testutils (649799b) with master (6c20562)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.86%. Comparing base (6c20562) to head (649799b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1676      +/-   ##
==========================================
+ Coverage   97.56%   97.86%   +0.29%     
==========================================
  Files         174      176       +2     
  Lines       15876    15995     +119     
  Branches     3646     3666      +20     
==========================================
+ Hits        15490    15654     +164     
+ Misses        289      255      -34     
+ Partials       97       86      -11     

Flag	Coverage Δ
eest-develop	87.66% <ø> (ø)
eest-develop-gmp	26.08% <0.00%> (-0.20%)	⬇️
eest-legacy	16.82% <0.00%> (-0.13%)	⬇️
eest-libsecp256k1	28.31% <0.00%> (-0.22%)	⬇️
eest-stable	87.66% <ø> (ø)
evmone-unittests	93.88% <100.00%> (+0.53%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
core	96.19% <ø> (+0.07%)	⬆️
tooling	92.89% <ø> (+2.20%)	⬆️
tests	99.81% <100.00%> (+<0.01%)	⬆️

Files with missing lines	Coverage Δ
test/blockchaintest/blockchaintest.cpp	88.70% <ø> (ø)
test/unittests/blockchaintest_runner_test.cpp	100.00% <100.00%> (ø)
test/unittests/statetest_runner_test.cpp	100.00% <100.00%> (ø)
test/utils/blockchaintest_runner.cpp	87.80% <ø> (ø)
test/utils/statetest_runner.cpp	92.98% <ø> (ø)

... and 2 files with indirect coverage changes

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[Copilot]

Pull request overview

Moves fixture runners into evmone::testutils, enabling tooling builds without GTest dependencies.

Changes:

• Relocates state and blockchain runners into testutils.
• Exposes the blockchain runner through blockchaintest.hpp.
• Adds direct unit coverage for runner failure paths.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
test/utils/statetest_runner.cpp	Adds the relocated state-test runner.
test/utils/CMakeLists.txt	Builds both runners into testutils.
test/utils/blockchaintest.hpp	Declares the blockchain runner API.
test/utils/blockchaintest_runner.cpp	Uses the shared blockchain-test header.
test/unittests/statetest_runner_test.cpp	Tests state-runner failure reporting.
test/unittests/blockchaintest_runner_test.cpp	Tests validation, RLP, and state-reporting paths.
test/unittests/CMakeLists.txt	Registers the new unit tests.
test/statetest/CMakeLists.txt	Removes the runner from the executable sources.
test/integration/statetest/tx/invalid_nonce.json	Removes the migrated nonce fixture.
test/integration/statetest/CMakeLists.txt	Removes the migrated integration test.
test/blockchaintest/CMakeLists.txt	Removes locally compiled runner files.
test/blockchaintest/blockchaintest.cpp	Includes the shared runner declaration.
test/blockchaintest/blockchaintest_runner.hpp	Retires the redundant runner header.

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[Copilot]

Pull request overview

Copilot reviewed 12 out of 13 changed files in this pull request and generated 1 comment.