core/tests/coretests/src/android/print/IPrintManagerParametersTest.java

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.print;

import android.annotation.NonNull;
import android.content.ComponentName;
import android.content.Context;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.os.Handler;
import android.os.Looper;
import android.os.ParcelFileDescriptor;
import android.os.Process;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.print.PrintAttributes.Margins;
import android.print.PrintAttributes.MediaSize;
import android.print.PrintAttributes.Resolution;
import android.printservice.PrintServiceInfo;
import android.printservice.recommendation.IRecommendationsChangeListener;

import android.print.mockservice.MockPrintService;
import android.print.mockservice.PrintServiceCallbacks;
import android.print.mockservice.PrinterDiscoverySessionCallbacks;
import android.print.mockservice.StubbablePrinterDiscoverySession;

import android.test.suitebuilder.annotation.LargeTest;
import android.test.suitebuilder.annotation.MediumTest;
import org.mockito.invocation.InvocationOnMock;
import org.mockito.stubbing.Answer;

import java.util.ArrayList;
import java.util.List;

/**
 * tests feeding all possible parameters to the IPrintManager Binder.
 */
public class IPrintManagerParametersTest extends BasePrintTest {

    private final int BAD_APP_ID = 0xffffffff;

    private final int mAppId;
    private final int mUserId;
    private final PrintJobId mBadPrintJobId;

    private PrintJob mGoodPrintJob;
    private PrinterId mBadPrinterId;
    private PrinterId mGoodPrinterId;
    private ComponentName mGoodComponentName;
    private ComponentName mBadComponentName;

    private IPrintManager mIPrintManager;

    /**
     * Create a new IPrintManagerParametersTest and setup basic fields.
     */
    public IPrintManagerParametersTest() {
        super();

        mAppId = UserHandle.getAppId(Process.myUid());
        mUserId = UserHandle.myUserId();
        mBadPrintJobId = new PrintJobId();
        mBadComponentName = new ComponentName("bad", "bad");
    }

    /**
     * Create a mock PrintDocumentAdapter.
     *
     * @return The adapter
     */
    private @NonNull PrintDocumentAdapter createMockAdapter() {
        return new PrintDocumentAdapter() {
            @Override
            public void onStart() {
                onStartCalled();
            }

            @Override
            public void onLayout(PrintAttributes oldAttributes, PrintAttributes newAttributes,
                    CancellationSignal cancellationSignal, LayoutResultCallback callback,
                    Bundle extras) {
            }

            @Override
            public void onWrite(PageRange[] pages, ParcelFileDescriptor destination,
                    CancellationSignal cancellationSignal, WriteResultCallback callback) {
            }
        };
    }

    /**
     * Create mock print service callbacks.
     *
     * @return the callbacks
     */
    private PrintServiceCallbacks createMockCallbacks() {
        return createMockPrintServiceCallbacks(
                new Answer<PrinterDiscoverySessionCallbacks>() {
                    @Override
                    public PrinterDiscoverySessionCallbacks answer(InvocationOnMock invocation) {
                        return createMockPrinterDiscoverySessionCallbacks(new Answer<Void>() {
                            @Override
                            public Void answer(InvocationOnMock invocation) {
                                // Get the session.
                                StubbablePrinterDiscoverySession session =
                                        ((PrinterDiscoverySessionCallbacks) invocation
                                        .getMock()).getSession();

                                if (session.getPrinters().isEmpty()) {
                                    final String PRINTER_NAME = "good printer";
                                    List<PrinterInfo> printers = new ArrayList<>();

                                    // Add the printer.
                                    mGoodPrinterId = session.getService()
                                            .generatePrinterId(PRINTER_NAME);

                                    PrinterCapabilitiesInfo capabilities =
                                            new PrinterCapabilitiesInfo.Builder(mGoodPrinterId)
                                                    .setMinMargins(
                                                            new Margins(200, 200, 200, 200))
                                                    .addMediaSize(MediaSize.ISO_A4, true)
                                                    .addResolution(new Resolution("300x300",
                                                            "300x300", 300, 300),
                                                            true)
                                                    .setColorModes(
                                                            PrintAttributes.COLOR_MODE_COLOR,
                                                            PrintAttributes.COLOR_MODE_COLOR)
                                                    .build();

                                    PrinterInfo printer = new PrinterInfo.Builder(
                                            mGoodPrinterId,
                                            PRINTER_NAME,
                                            PrinterInfo.STATUS_IDLE)
                                                    .setCapabilities(capabilities)
                                                    .build();
                                    printers.add(printer);

                                    session.addPrinters(printers);
                                }
                                onPrinterDiscoverySessionStartCalled();
                                return null;
                            }
                        }, null, null, null, null, null, null);
                    }
                },
                null, null);
    }

    /**
     * Create a IPrintJobStateChangeListener object.
     *
     * @return the object
     * @throws Exception if the object could not be created.
     */
    private IPrintJobStateChangeListener createMockIPrintJobStateChangeListener() throws Exception {
        return new PrintManager.PrintJobStateChangeListenerWrapper(null,
                new Handler(Looper.getMainLooper()));
    }

    /**
     * Create a IPrintServicesChangeListener object.
     *
     * @return the object
     * @throws Exception if the object could not be created.
     */
    private IPrintServicesChangeListener createMockIPrintServicesChangeListener() throws Exception {
        return new PrintManager.PrintServicesChangeListenerWrapper(null,
                new Handler(Looper.getMainLooper()));
    }

    /**
     * Create a IPrintServiceRecommendationsChangeListener object.
     *
     * @return the object
     * @throws Exception if the object could not be created.
     */
    private IRecommendationsChangeListener
    createMockIPrintServiceRecommendationsChangeListener() throws Exception {
        return new PrintManager.PrintServiceRecommendationsChangeListenerWrapper(null,
                new Handler(Looper.getMainLooper()));
    }

    /**
     * Create a IPrinterDiscoveryObserver object.
     *
     * @return the object
     * @throws Exception if the object could not be created.
     */
    private IPrinterDiscoveryObserver createMockIPrinterDiscoveryObserver() throws Exception {
        return new PrinterDiscoverySession.PrinterDiscoveryObserver(null);
    }

    private void startPrinting() {
        mGoodPrintJob = print(createMockAdapter(), null);

        // Wait for PrintActivity to be ready
        waitForStartAdapterCallbackCalled();

        // Wait for printer discovery session to be ready
        waitForPrinterDiscoverySessionStartCallbackCalled();
    }

    @Override
    public void setUp() throws Exception {
        super.setUp();

        MockPrintService.setCallbacks(createMockCallbacks());

        mGoodComponentName = getActivity().getComponentName();

        mIPrintManager = IPrintManager.Stub
                .asInterface(ServiceManager.getService(Context.PRINT_SERVICE));

        // Generate dummy printerId which is a valid PrinterId object, but does not correspond to a
        // printer
        mBadPrinterId = new PrinterId(mGoodComponentName, "dummy printer");
    }

    /**
     * {@link Runnable} that can throw and {@link Exception}
     */
    private interface Invokable {
        /**
         * Execute the invokable
         *
         * @throws Exception
         */
        void run() throws Exception;
    }

    /**
     * Assert that the invokable throws an expectedException
     *
     * @param invokable The {@link Invokable} to run
     * @param expectedClass The {@link Exception} that is supposed to be thrown
     */
    public void assertException(Invokable invokable, Class<? extends Exception> expectedClass)
            throws Exception {
        try {
            invokable.run();
        } catch (Exception e) {
            if (e.getClass().isAssignableFrom(expectedClass)) {
                return;
            } else {
                throw new AssertionError("Expected: " + expectedClass.getName() + ", got: "
                                + e.getClass().getName());
            }
        }

        throw new AssertionError("No exception thrown");
    }

    /**
     * test IPrintManager.getPrintJobInfo
     */
    @LargeTest
    public void testGetPrintJobInfo() throws Exception {
        startPrinting();

        assertEquals(mGoodPrintJob.getId(), mIPrintManager.getPrintJobInfo(mGoodPrintJob.getId(),
                        mAppId, mUserId).getId());
        assertEquals(null, mIPrintManager.getPrintJobInfo(mBadPrintJobId, mAppId, mUserId));
        assertEquals(null, mIPrintManager.getPrintJobInfo(null, mAppId, mUserId));

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.getPrintJobInfo(mGoodPrintJob.getId(), BAD_APP_ID, mUserId);
            }
        }, SecurityException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.getPrintJobInfos
     */
    @LargeTest
    public void testGetPrintJobInfos() throws Exception {
        startPrinting();

        List<PrintJobInfo> infos = mIPrintManager.getPrintJobInfos(mAppId, mUserId);

        boolean foundPrintJob = false;
        for (PrintJobInfo info : infos) {
            if (info.getId().equals(mGoodPrintJob.getId())) {
                assertEquals(PrintJobInfo.STATE_CREATED, info.getState());
                foundPrintJob = true;
            }
        }
        assertTrue(foundPrintJob);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.getPrintJobInfos(BAD_APP_ID, mUserId);
            }
        }, SecurityException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.print
     */
    @LargeTest
    public void testPrint() throws Exception {
        final String name = "dummy print job";

        final IPrintDocumentAdapter adapter = new PrintManager
                .PrintDocumentAdapterDelegate(getActivity(), createMockAdapter());

        startPrinting();

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.print(null, adapter, null, mGoodComponentName.getPackageName(),
                        mAppId, mUserId);
            }
        }, IllegalArgumentException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.print(name, null, null, mGoodComponentName.getPackageName(),
                        mAppId, mUserId);
            }
        }, NullPointerException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.print(name, adapter, null, null, mAppId, mUserId);
            }
        }, IllegalArgumentException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.print(name, adapter, null, mBadComponentName.getPackageName(),
                        mAppId, mUserId);
            }
        }, IllegalArgumentException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.print(name, adapter, null, mGoodComponentName.getPackageName(),
                        BAD_APP_ID, mUserId);
            }
        }, SecurityException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.cancelPrintJob
     */
    @LargeTest
    public void testCancelPrintJob() throws Exception {
        startPrinting();

        // Invalid print jobs IDs do not produce an exception
        mIPrintManager.cancelPrintJob(mBadPrintJobId, mAppId, mUserId);
        mIPrintManager.cancelPrintJob(null, mAppId, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.cancelPrintJob(mGoodPrintJob.getId(), BAD_APP_ID, mUserId);
            }
        }, SecurityException.class);

        // Cannot test bad user Id as these tests are allowed to call across users

        // Must be last as otherwise mGoodPrintJob will not be good anymore
        mIPrintManager.cancelPrintJob(mGoodPrintJob.getId(), mAppId, mUserId);
    }

    /**
     * test IPrintManager.restartPrintJob
     */
    @LargeTest
    public void testRestartPrintJob() throws Exception {
        startPrinting();

        mIPrintManager.restartPrintJob(mGoodPrintJob.getId(), mAppId, mUserId);

        // Invalid print jobs IDs do not produce an exception
        mIPrintManager.restartPrintJob(mBadPrintJobId, mAppId, mUserId);
        mIPrintManager.restartPrintJob(null, mAppId, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.restartPrintJob(mGoodPrintJob.getId(), BAD_APP_ID, mUserId);
            }
        }, SecurityException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.addPrintJobStateChangeListener
     */
    @MediumTest
    public void testAddPrintJobStateChangeListener() throws Exception {
        final IPrintJobStateChangeListener listener = createMockIPrintJobStateChangeListener();

        mIPrintManager.addPrintJobStateChangeListener(listener, mAppId, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.addPrintJobStateChangeListener(null, mAppId, mUserId);
            }
        }, NullPointerException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.addPrintJobStateChangeListener(listener, BAD_APP_ID, mUserId);
            }
        }, SecurityException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.removePrintJobStateChangeListener
     */
    @MediumTest
    public void testRemovePrintJobStateChangeListener() throws Exception {
        final IPrintJobStateChangeListener listener = createMockIPrintJobStateChangeListener();

        mIPrintManager.addPrintJobStateChangeListener(listener, mAppId, mUserId);
        mIPrintManager.removePrintJobStateChangeListener(listener, mUserId);

        // Removing unknown listeners is a no-op
        mIPrintManager.removePrintJobStateChangeListener(listener, mUserId);

        mIPrintManager.addPrintJobStateChangeListener(listener, mAppId, mUserId);
        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.removePrintJobStateChangeListener(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.addPrintServicesChangeListener
     */
    @MediumTest
    public void testAddPrintServicesChangeListener() throws Exception {
        final IPrintServicesChangeListener listener = createMockIPrintServicesChangeListener();

        mIPrintManager.addPrintServicesChangeListener(listener, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.addPrintServicesChangeListener(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.removePrintServicesChangeListener
     */
    @MediumTest
    public void testRemovePrintServicesChangeListener() throws Exception {
        final IPrintServicesChangeListener listener = createMockIPrintServicesChangeListener();

        mIPrintManager.addPrintServicesChangeListener(listener, mUserId);
        mIPrintManager.removePrintServicesChangeListener(listener, mUserId);

        // Removing unknown listeners is a no-op
        mIPrintManager.removePrintServicesChangeListener(listener, mUserId);

        mIPrintManager.addPrintServicesChangeListener(listener, mUserId);
        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.removePrintServicesChangeListener(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.getPrintServices
     */
    @MediumTest
    public void testGetPrintServices() throws Exception {
        List<PrintServiceInfo> printServices = mIPrintManager.getPrintServices(
                PrintManager.ALL_SERVICES, mUserId);
        assertTrue(printServices.size() >= 2);

        printServices = mIPrintManager.getPrintServices(0, mUserId);
        assertEquals(printServices, null);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.getPrintServices(~PrintManager.ALL_SERVICES, mUserId);
            }
        }, IllegalArgumentException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.setPrintServiceEnabled
     */
    @MediumTest
    public void testSetPrintServiceEnabled() throws Exception {
        final ComponentName printService = mIPrintManager.getPrintServices(
                PrintManager.ALL_SERVICES, mUserId).get(0).getComponentName();

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.setPrintServiceEnabled(printService, false, mUserId);
            }
        }, SecurityException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.setPrintServiceEnabled(printService, true, mUserId);
            }
        }, SecurityException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.setPrintServiceEnabled(new ComponentName("bad", "name"), true,
                                mUserId);
            }
        }, SecurityException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.setPrintServiceEnabled(null, true, mUserId);
            }
        }, SecurityException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.addPrintServiceRecommendationsChangeListener
     */
    @MediumTest
    public void testAddPrintServiceRecommendationsChangeListener() throws Exception {
        final IRecommendationsChangeListener listener =
                createMockIPrintServiceRecommendationsChangeListener();

        mIPrintManager.addPrintServiceRecommendationsChangeListener(listener, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.addPrintServiceRecommendationsChangeListener(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.removePrintServicesChangeListener
     */
    @MediumTest
    public void testRemovePrintServiceRecommendationsChangeListener() throws Exception {
        final IRecommendationsChangeListener listener =
                createMockIPrintServiceRecommendationsChangeListener();

        mIPrintManager.addPrintServiceRecommendationsChangeListener(listener, mUserId);
        mIPrintManager.removePrintServiceRecommendationsChangeListener(listener, mUserId);

        // Removing unknown listeners is a no-op
        mIPrintManager.removePrintServiceRecommendationsChangeListener(listener, mUserId);

        mIPrintManager.addPrintServiceRecommendationsChangeListener(listener, mUserId);
        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.removePrintServiceRecommendationsChangeListener(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.getPrintServiceRecommendations
     */
    @MediumTest
    public void testGetPrintServiceRecommendations() throws Exception {
        mIPrintManager.getPrintServiceRecommendations(mUserId);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.createPrinterDiscoverySession
     */
    @MediumTest
    public void testCreatePrinterDiscoverySession() throws Exception {
        final IPrinterDiscoveryObserver listener = createMockIPrinterDiscoveryObserver();

        mIPrintManager.createPrinterDiscoverySession(listener, mUserId);

        try {
            assertException(new Invokable() {
                @Override
                public void run() throws Exception {
                    mIPrintManager.createPrinterDiscoverySession(null, mUserId);
                }
            }, NullPointerException.class);

            // Cannot test bad user Id as these tests are allowed to call across users
        } finally {
            // Remove discovery session so that the next test create a new one. Usually a leaked
            // session is removed on the next call from the print service. But in this case we want
            // to force a new call to onPrinterDiscoverySessionStart in the next test.
            mIPrintManager.destroyPrinterDiscoverySession(listener, mUserId);
        }
    }

    /**
     * test IPrintManager.startPrinterDiscovery
     */
    @LargeTest
    public void testStartPrinterDiscovery() throws Exception {
        startPrinting();

        final IPrinterDiscoveryObserver listener = createMockIPrinterDiscoveryObserver();
        final List<PrinterId> goodPrinters = new ArrayList<>();
        goodPrinters.add(mGoodPrinterId);

        final List<PrinterId> badPrinters = new ArrayList<>();
        badPrinters.add(mBadPrinterId);

        final List<PrinterId> emptyPrinters = new ArrayList<>();

        final List<PrinterId> nullPrinters = new ArrayList<>();
        nullPrinters.add(null);

        mIPrintManager.startPrinterDiscovery(listener, goodPrinters, mUserId);

        // Bad or no printers do no cause exceptions
        mIPrintManager.startPrinterDiscovery(listener, badPrinters, mUserId);
        mIPrintManager.startPrinterDiscovery(listener, emptyPrinters, mUserId);
        mIPrintManager.startPrinterDiscovery(listener, null, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.startPrinterDiscovery(listener, nullPrinters, mUserId);
            }
        }, NullPointerException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.startPrinterDiscovery(null, goodPrinters, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.stopPrinterDiscovery
     */
    @MediumTest
    public void testStopPrinterDiscovery() throws Exception {
        final IPrinterDiscoveryObserver listener = createMockIPrinterDiscoveryObserver();

        mIPrintManager.startPrinterDiscovery(listener, null, mUserId);
        mIPrintManager.stopPrinterDiscovery(listener, mUserId);

        // Stopping an already stopped session is a no-op
        mIPrintManager.stopPrinterDiscovery(listener, mUserId);

        mIPrintManager.startPrinterDiscovery(listener, null, mUserId);
        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.stopPrinterDiscovery(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.validatePrinters
     */
    @LargeTest
    public void testValidatePrinters() throws Exception {
        startPrinting();

        final List<PrinterId> goodPrinters = new ArrayList<>();
        goodPrinters.add(mGoodPrinterId);

        final List<PrinterId> badPrinters = new ArrayList<>();
        badPrinters.add(mBadPrinterId);

        final List<PrinterId> emptyPrinters = new ArrayList<>();

        final List<PrinterId> nullPrinters = new ArrayList<>();
        nullPrinters.add(null);

        mIPrintManager.validatePrinters(goodPrinters, mUserId);

        // Bad or empty list of printers do no cause exceptions
        mIPrintManager.validatePrinters(badPrinters, mUserId);
        mIPrintManager.validatePrinters(emptyPrinters, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.validatePrinters(null, mUserId);
            }
        }, NullPointerException.class);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.validatePrinters(nullPrinters, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.startPrinterStateTracking
     */
    @LargeTest
    public void testStartPrinterStateTracking() throws Exception {
        startPrinting();

        mIPrintManager.startPrinterStateTracking(mGoodPrinterId, mUserId);

        // Bad printers do no cause exceptions
        mIPrintManager.startPrinterStateTracking(mBadPrinterId, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.startPrinterStateTracking(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.getCustomPrinterIcon
     */
    @LargeTest
    public void testGetCustomPrinterIcon() throws Exception {
        startPrinting();

        mIPrintManager.getCustomPrinterIcon(mGoodPrinterId, mUserId);

        // Bad printers do no cause exceptions
        mIPrintManager.getCustomPrinterIcon(mBadPrinterId, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.getCustomPrinterIcon(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.stopPrinterStateTracking
     */
    @LargeTest
    public void testStopPrinterStateTracking() throws Exception {
        startPrinting();

        mIPrintManager.startPrinterStateTracking(mGoodPrinterId, mUserId);
        mIPrintManager.stopPrinterStateTracking(mGoodPrinterId, mUserId);

        // Stop to track a non-tracked printer is a no-op
        mIPrintManager.stopPrinterStateTracking(mGoodPrinterId, mUserId);

        // Bad printers do no cause exceptions
        mIPrintManager.startPrinterStateTracking(mBadPrinterId, mUserId);
        mIPrintManager.stopPrinterStateTracking(mBadPrinterId, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.stopPrinterStateTracking(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }

    /**
     * test IPrintManager.destroyPrinterDiscoverySession
     */
    @MediumTest
    public void testDestroyPrinterDiscoverySession() throws Exception {
        final IPrinterDiscoveryObserver listener = createMockIPrinterDiscoveryObserver();

        mIPrintManager.createPrinterDiscoverySession(listener, mUserId);
        mIPrintManager.destroyPrinterDiscoverySession(listener, mUserId);

        // Destroying already destroyed session is a no-op
        mIPrintManager.destroyPrinterDiscoverySession(listener, mUserId);

        assertException(new Invokable() {
            @Override
            public void run() throws Exception {
                mIPrintManager.destroyPrinterDiscoverySession(null, mUserId);
            }
        }, NullPointerException.class);

        // Cannot test bad user Id as these tests are allowed to call across users
    }
}