test: remove BasicTestingSetup from arith_uint256 unit tests

Author: fanquake

src/test/arith_uint256_tests.cpp

@@ -3,19 +3,19 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <arith_uint256.h>
-#include <test/util/setup_common.h>
 #include <uint256.h>
 
 #include <boost/test/unit_test.hpp>
 
 #include <cmath>
+#include <cstdint>
 #include <iomanip>
 #include <limits>
 #include <sstream>
-#include <stdint.h>
 #include <string>
+#include <vector>
 
-BOOST_FIXTURE_TEST_SUITE(arith_uint256_tests, BasicTestingSetup)
+BOOST_AUTO_TEST_SUITE(arith_uint256_tests)
 
 /// Convert vector to arith_uint256, via uint256 blob
 static inline arith_uint256 arith_uint256V(const std::vector<unsigned char>& vch)