Merge bitcoin#18371: test: use fs namespace in dbwrapper unicodepath …

…test

6afaf2f test: use fs namespace in dbwrapper unicodepath test (fanquake)

Pull request description:

  Use our `fs` namespace rather than `boost::filesystem`. Test was added in bitcoin#17641.

ACKs for top commit:
  sipsorcery:
    ACK 6afaf2f.

Tree-SHA512: 5ee024a6d90183b6c344f6a94cfbcacb006973f1f6d98cc421c1c6ef08c09b590d31c78b70b86d855e825241ffea25989cfc40d1bdd53e38a75cda0718ac4489

src/test/dbwrapper_tests.cpp

@@ -399,15 +399,15 @@ BOOST_AUTO_TEST_CASE(iterator_string_ordering)
 
 BOOST_AUTO_TEST_CASE(unicodepath)
 {
-    // Attempt to create a database with a utf8 character in the path.
+    // Attempt to create a database with a UTF8 character in the path.
     // On Windows this test will fail if the directory is created using
-    // the ANSI CreateDirectoryA  call and the code page isn't UTF8.
-    // It will succeed if the created with  CreateDirectoryW.
+    // the ANSI CreateDirectoryA call and the code page isn't UTF8.
+    // It will succeed if created with CreateDirectoryW.
     fs::path ph = GetDataDir() / "test_runner_₿_🏃_20191128_104644";
     CDBWrapper dbw(ph, (1 << 20));
 
     fs::path lockPath = ph / "LOCK";
-    BOOST_CHECK(boost::filesystem::exists(lockPath));
+    BOOST_CHECK(fs::exists(lockPath));
 }