| /* |
| * Copyright (C) 2018 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 com.android.server.backup.encryption.keys; |
| |
| import static com.google.common.truth.Truth.assertThat; |
| |
| import android.platform.test.annotations.Presubmit; |
| |
| import org.junit.Before; |
| import org.junit.Test; |
| import org.junit.runner.RunWith; |
| import org.robolectric.RobolectricTestRunner; |
| import org.robolectric.RuntimeEnvironment; |
| |
| /** Tests for {@link TertiaryKeyRotationTracker}. */ |
| @RunWith(RobolectricTestRunner.class) |
| @Presubmit |
| public class TertiaryKeyRotationTrackerTest { |
| private static final String PACKAGE_1 = "com.package.one"; |
| private static final int NUMBER_OF_BACKUPS_BEFORE_ROTATION = 31; |
| |
| private TertiaryKeyRotationTracker mTertiaryKeyRotationTracker; |
| |
| /** Instantiate a {@link TertiaryKeyRotationTracker} for use in tests. */ |
| @Before |
| public void setUp() { |
| mTertiaryKeyRotationTracker = newInstance(); |
| } |
| |
| /** New packages should not be due for key rotation. */ |
| @Test |
| public void isKeyRotationDue_forNewPackage_isFalse() { |
| // Simulate a new package by not calling simulateBackups(). As a result, PACKAGE_1 hasn't |
| // been seen by mTertiaryKeyRotationTracker before. |
| boolean keyRotationDue = mTertiaryKeyRotationTracker.isKeyRotationDue(PACKAGE_1); |
| |
| assertThat(keyRotationDue).isFalse(); |
| } |
| |
| /** |
| * Key rotation should not be due after less than {@code NUMBER_OF_BACKUPS_BEFORE_ROTATION} |
| * backups. |
| */ |
| @Test |
| public void isKeyRotationDue_afterLessThanRotationAmountBackups_isFalse() { |
| simulateBackups(PACKAGE_1, NUMBER_OF_BACKUPS_BEFORE_ROTATION - 1); |
| |
| boolean keyRotationDue = mTertiaryKeyRotationTracker.isKeyRotationDue(PACKAGE_1); |
| |
| assertThat(keyRotationDue).isFalse(); |
| } |
| |
| /** Key rotation should be due after {@code NUMBER_OF_BACKUPS_BEFORE_ROTATION} backups. */ |
| @Test |
| public void isKeyRotationDue_afterRotationAmountBackups_isTrue() { |
| simulateBackups(PACKAGE_1, NUMBER_OF_BACKUPS_BEFORE_ROTATION); |
| |
| boolean keyRotationDue = mTertiaryKeyRotationTracker.isKeyRotationDue(PACKAGE_1); |
| |
| assertThat(keyRotationDue).isTrue(); |
| } |
| |
| /** |
| * A call to {@link TertiaryKeyRotationTracker#resetCountdown(String)} should make sure no key |
| * rotation is due. |
| */ |
| @Test |
| public void resetCountdown_makesKeyRotationNotDue() { |
| simulateBackups(PACKAGE_1, NUMBER_OF_BACKUPS_BEFORE_ROTATION); |
| |
| mTertiaryKeyRotationTracker.resetCountdown(PACKAGE_1); |
| |
| assertThat(mTertiaryKeyRotationTracker.isKeyRotationDue(PACKAGE_1)).isFalse(); |
| } |
| |
| /** |
| * New instances of {@link TertiaryKeyRotationTracker} should read state about the number of |
| * backups from disk. |
| */ |
| @Test |
| public void isKeyRotationDue_forNewInstance_readsStateFromDisk() { |
| simulateBackups(PACKAGE_1, NUMBER_OF_BACKUPS_BEFORE_ROTATION); |
| |
| boolean keyRotationDueForNewInstance = newInstance().isKeyRotationDue(PACKAGE_1); |
| |
| assertThat(keyRotationDueForNewInstance).isTrue(); |
| } |
| |
| /** |
| * A call to {@link TertiaryKeyRotationTracker#markAllForRotation()} should mark all previously |
| * seen packages for rotation. |
| */ |
| @Test |
| public void markAllForRotation_marksSeenPackagesForKeyRotation() { |
| simulateBackups(PACKAGE_1, /*numberOfBackups=*/ 1); |
| |
| mTertiaryKeyRotationTracker.markAllForRotation(); |
| |
| assertThat(mTertiaryKeyRotationTracker.isKeyRotationDue(PACKAGE_1)).isTrue(); |
| } |
| |
| /** |
| * A call to {@link TertiaryKeyRotationTracker#markAllForRotation()} should not mark any new |
| * packages for rotation. |
| */ |
| @Test |
| public void markAllForRotation_doesNotMarkUnseenPackages() { |
| mTertiaryKeyRotationTracker.markAllForRotation(); |
| |
| assertThat(mTertiaryKeyRotationTracker.isKeyRotationDue(PACKAGE_1)).isFalse(); |
| } |
| |
| private void simulateBackups(String packageName, int numberOfBackups) { |
| while (numberOfBackups > 0) { |
| mTertiaryKeyRotationTracker.recordBackup(packageName); |
| numberOfBackups--; |
| } |
| } |
| |
| private static TertiaryKeyRotationTracker newInstance() { |
| return TertiaryKeyRotationTracker.getInstance(RuntimeEnvironment.application); |
| } |
| } |