Add testing for GridMigration.

    private final @DeviceType int mDeviceType;

    private final String mDbFile;

    public DeviceGridState(int columns, int row, int numHotseat, int deviceType, String dbFile) {

        mGridSizeString = String.format(Locale.ENGLISH, "%d,%d", columns, row);

        mNumHotseat = numHotseat;

        mDeviceType = deviceType;

        mDbFile = dbFile;

    }

    public DeviceGridState(InvariantDeviceProfile idp) {

        mGridSizeString = String.format(Locale.ENGLISH, "%d,%d", idp.numColumns, idp.numRows);

        mNumHotseat = idp.numDatabaseHotseatIcons;

import android.util.Log;

import androidx.annotation.NonNull;

import androidx.annotation.VisibleForTesting;

import com.android.launcher3.InvariantDeviceProfile;

import com.android.launcher3.LauncherPrefs;

        return needsToMigrate;

    }

    @VisibleForTesting

    public static List<DbEntry> readAllEntries(SQLiteDatabase db, String tableName,

            Context context) {

        DbReader dbReader = new DbReader(db, tableName, context, getValidPackages(context));

        List<DbEntry> result = dbReader.loadAllWorkspaceEntries();

        result.addAll(dbReader.loadHotseatEntries());

        return result;

    }

    /**

     * When migrating the grid, we copy the table

     * {@link LauncherSettings.Favorites#TABLE_NAME} from {@code source} into

        }

    }

    protected static class DbEntry extends ItemInfo implements Comparable<DbEntry> {

    public static class DbEntry extends ItemInfo implements Comparable<DbEntry> {

        private String mIntent;

        private String mProvider;