### Question:
MigrationTo60 { static void migratePendingCommands(SQLiteDatabase db) { List<PendingCommand> pendingCommands = new ArrayList<>(); if (columnExists(db, "pending_commands", "arguments")) { for (OldPendingCommand oldPendingCommand : getPendingCommands(db)) { PendingCommand newPendingCommand = migratePendingCommand(oldPendingCommand); pendingCommands.add(newPendingCommand); } db.execSQL("DROP TABLE IF EXISTS pending_commands"); db.execSQL("CREATE TABLE pending_commands (" + "id INTEGER PRIMARY KEY, " + "command TEXT, " + "data TEXT" + ")"); PendingCommandSerializer pendingCommandSerializer = PendingCommandSerializer.getInstance(); for (PendingCommand pendingCommand : pendingCommands) { ContentValues cv = new ContentValues(); cv.put("command", pendingCommand.getCommandName()); cv.put("data", pendingCommandSerializer.serialize(pendingCommand)); db.insert("pending_commands", "command", cv); } } }    }### Answer:
@Test public void migratePendingCommands_shouldChangeTableStructure() { SQLiteDatabase database = createV59Table(); MigrationTo60.migratePendingCommands(database); List<String> columns = getColumnList(database, "pending_commands"); assertEquals(asList("id", "command", "data"), columns); }
@Test public void migratePendingCommands_withMultipleRuns_shouldNotThrow() { SQLiteDatabase database = createV59Table(); MigrationTo60.migratePendingCommands(database); MigrationTo60.migratePendingCommands(database); }