use 1 code exit code, which seems more normal, and fix unit tests

h2/src/main/org/h2/tools/ChangeFileEncryption.java

@@ -68,7 +68,7 @@ public class ChangeFileEncryption extends Tool {
             new ChangeFileEncryption().runTool(args);
         } catch (SQLException ex) {
             ex.printStackTrace(System.err);
-            System.exit(-1);
+            System.exit(1);
         }
     }
 

h2/src/test/org/h2/test/unit/TestSampleApps.java

@@ -13,7 +13,6 @@ import java.io.PrintStream;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.nio.charset.StandardCharsets;
-
 import org.h2.store.fs.FileUtils;
 import org.h2.test.TestBase;
 import org.h2.tools.DeleteDbFiles;
@@ -106,8 +105,6 @@ public class TestSampleApps extends TestBase {
         // tools
         testApp("Allows changing the database file encryption password or algorithm*",
                 org.h2.tools.ChangeFileEncryption.class, "-help");
-        testApp("Allows changing the database file encryption password or algorithm*",
-                org.h2.tools.ChangeFileEncryption.class);
         testApp("Deletes all files belonging to a database.*",
                 org.h2.tools.DeleteDbFiles.class, "-help");
         FileUtils.delete(getBaseDir() + "/optimizations.sql");

h2/src/test/org/h2/test/unit/TestTools.java

@@ -1054,14 +1054,8 @@ public class TestTools extends TestBase {
     }
 
     private void testChangeFileEncryptionWithWrongPassword() throws SQLException {
-        if (config.mvStore) {
-            // the file system encryption abstraction used by the MVStore
-            // doesn't detect wrong passwords
-            return;
-        }
         org.h2.Driver.load();
         final String dir = getBaseDir();
-        // TODO: this doesn't seem to work in MVSTORE mode yet
         String url = "jdbc:h2:" + dir + "/testChangeFileEncryption;CIPHER=AES";
         DeleteDbFiles.execute(dir, "testChangeFileEncryption", true);
         Connection conn = getConnection(url, "sa", "abc 123");