add unit tests for PendingCommand serialization

package com.fsck.k9.controller;

import java.util.HashMap;

import com.fsck.k9.controller.MessagingControllerCommands.PendingAppend;

import com.fsck.k9.controller.MessagingControllerCommands.PendingCommand;

import com.fsck.k9.controller.MessagingControllerCommands.PendingEmptyTrash;

import com.fsck.k9.controller.MessagingControllerCommands.PendingMoveOrCopy;

import org.junit.Test;

import static org.junit.Assert.assertEquals;

public class PendingCommandSerializerTest {

    static final int DATABASE_ID = 123;

    static final String UID = "uid";

    static final String SOURCE_FOLDER = "source_folder";

    static final String DEST_FOLDER = "dest_folder";

    static final HashMap<String, String> UID_MAP = new HashMap<>();

    public static final boolean IS_COPY = true;

    static {

        UID_MAP.put("uid_1", "uid_other_1");

        UID_MAP.put("uid_2", "uid_other_2");

    }

    PendingCommandSerializer pendingCommandSerializer = PendingCommandSerializer.getInstance();

    @Test

    public void testSerializeDeserialize__withoutArguments() {

        PendingCommand pendingCommand = MessagingControllerCommands.createEmptyTrash();

        String serializedCommand = pendingCommandSerializer.serialize(pendingCommand);

        PendingEmptyTrash unserializedCommand = (PendingEmptyTrash) pendingCommandSerializer.unserialize(

                DATABASE_ID, pendingCommand.getCommandName(), serializedCommand);

        assertEquals(DATABASE_ID, unserializedCommand.databaseId);

    }

    @Test

    public void testSerializeDeserialize__withArguments() {

        PendingCommand pendingCommand = MessagingControllerCommands.createAppend(SOURCE_FOLDER, UID);

        String serializedCommand = pendingCommandSerializer.serialize(pendingCommand);

        PendingAppend unserializedCommand = (PendingAppend) pendingCommandSerializer.unserialize(

                DATABASE_ID, pendingCommand.getCommandName(), serializedCommand);

        assertEquals(DATABASE_ID, unserializedCommand.databaseId);

        assertEquals(SOURCE_FOLDER, unserializedCommand.folder);

        assertEquals(UID, unserializedCommand.uid);

    }

    @Test

    public void testSerializeDeserialize__withComplexArguments() {

        PendingCommand pendingCommand = MessagingControllerCommands.createMoveOrCopyBulk(

                SOURCE_FOLDER, DEST_FOLDER, IS_COPY, UID_MAP);

        String serializedCommand = pendingCommandSerializer.serialize(pendingCommand);

        PendingMoveOrCopy unserializedCommand = (PendingMoveOrCopy) pendingCommandSerializer.unserialize(

                DATABASE_ID, pendingCommand.getCommandName(), serializedCommand);

        assertEquals(DATABASE_ID, unserializedCommand.databaseId);

        assertEquals(SOURCE_FOLDER, unserializedCommand.srcFolder);

        assertEquals(DEST_FOLDER, unserializedCommand.destFolder);

        assertEquals(UID_MAP, unserializedCommand.newUidMap);

    }

    @Test(expected = IllegalArgumentException.class)

    public void testDeserialize__withUnknownCommandName__shouldFail() {

        PendingCommand pendingCommand = MessagingControllerCommands.createEmptyTrash();

        String serializedCommand = pendingCommandSerializer.serialize(pendingCommand);

        pendingCommandSerializer.unserialize(DATABASE_ID,  "BAD_COMMAND_NAME", serializedCommand);

    }

}

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