Add src/wallet/* code to wallet:: namespace

src/wallet/test/coinselector_tests.cpp

@@ -18,6 +18,7 @@
 #include <boost/test/unit_test.hpp>
 #include <random>
 
+namespace wallet {
 BOOST_FIXTURE_TEST_SUITE(coinselector_tests, WalletTestingSetup)
 
 // how many times to run all the tests to have a chance to catch errors that only show up with particular random shuffles
@@ -807,3 +808,4 @@ BOOST_AUTO_TEST_CASE(waste_test)
 }
 
 BOOST_AUTO_TEST_SUITE_END()
+} // namespace wallet