Add compatibility mode test

These test cases ensure system correctly handles the global state
of compatibility mode and related flags in the application info.

Bug: 186592266
Test: atest CompatibilityModeTest
Change-Id: Ia9cb6fe0404a53add2362c89d98e9363dec5aa2e

1 files changed, 234 insertions, 0 deletions

diff --git a/services/tests/servicestests/src/com/android/server/pm/CompatibilityModeTest.java b/services/tests/servicestests/src/com/android/server/pm/CompatibilityModeTest.java
new file mode 100644
index 000000000000..94ac9be4af2a
--- /dev/null
+++ b/services/tests/servicestests/src/com/android/server/pm/CompatibilityModeTest.java
@@ -0,0 +1,234 @@
+/*
+ * Copyright (C) 2021 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.pm;
+
+import static android.content.pm.ApplicationInfo.FLAG_RESIZEABLE_FOR_SCREENS;
+import static android.content.pm.ApplicationInfo.FLAG_SUPPORTS_LARGE_SCREENS;
+import static android.content.pm.ApplicationInfo.FLAG_SUPPORTS_NORMAL_SCREENS;
+import static android.content.pm.ApplicationInfo.FLAG_SUPPORTS_SCREEN_DENSITIES;
+import static android.content.pm.ApplicationInfo.FLAG_SUPPORTS_SMALL_SCREENS;
+import static android.content.pm.ApplicationInfo.FLAG_SUPPORTS_XLARGE_SCREENS;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import android.content.pm.ApplicationInfo;
+import android.content.pm.PackageParser;
+import android.content.pm.PackageUserState;
+import android.content.pm.parsing.PackageInfoWithoutStateUtils;
+import android.os.Build;
+
+import com.android.server.pm.parsing.pkg.AndroidPackage;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+public class CompatibilityModeTest {
+
+    private boolean mCompatibilityModeEnabled;;
+    private AndroidPackage mMockAndroidPackage;
+    private PackageUserState mMockUserState;
+
+    @Before
+    public void setUp() {
+        mCompatibilityModeEnabled = PackageParser.sCompatibilityModeEnabled;
+        mMockAndroidPackage = mock(AndroidPackage.class);
+        mMockUserState = mock(PackageUserState.class);
+        mMockUserState.installed = true;
+        when(mMockUserState.isAvailable(anyInt())).thenReturn(true);
+        when(mMockUserState.getAllOverlayPaths()).thenReturn(null);
+    }
+
+    @After
+    public void tearDown() {
+        setGlobalCompatibilityMode(mCompatibilityModeEnabled);
+    }
+
+    // The following tests ensure that apps with target SDK of Cupcake always use compat mode.
+
+    @Test
+    public void testGlobalCompatModeEnabled_oldApp_supportAllScreens_usesCompatMode() {
+        setGlobalCompatibilityMode(true);
+        final int flags = (FLAG_SUPPORTS_LARGE_SCREENS | FLAG_SUPPORTS_NORMAL_SCREENS
+                | FLAG_SUPPORTS_SMALL_SCREENS | FLAG_RESIZEABLE_FOR_SCREENS
+                | FLAG_SUPPORTS_SCREEN_DENSITIES | FLAG_SUPPORTS_XLARGE_SCREENS);
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.CUPCAKE, flags);
+        assertThat(info.usesCompatibilityMode(), is(true));
+    }
+
+    @Test
+    public void testGlobalCompatModeEnabled_oldApp_supportSomeScreens_usesCompatMode() {
+        setGlobalCompatibilityMode(true);
+        final int flags = (FLAG_SUPPORTS_LARGE_SCREENS
+                | FLAG_SUPPORTS_SMALL_SCREENS | FLAG_RESIZEABLE_FOR_SCREENS
+                | FLAG_SUPPORTS_SCREEN_DENSITIES | FLAG_SUPPORTS_XLARGE_SCREENS);
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.CUPCAKE, flags);
+        assertThat(info.usesCompatibilityMode(), is(true));
+    }
+
+    @Test
+    public void testGlobalCompatModeEnabled_oldApp_supportOnlyOneScreen_usesCompatMode() {
+        setGlobalCompatibilityMode(true);
+        final int flags = FLAG_SUPPORTS_NORMAL_SCREENS;
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.CUPCAKE, flags);
+        assertThat(info.usesCompatibilityMode(), is(true));
+    }
+
+    @Test
+    public void testGlobalCompatModeEnabled_oldApp_DoesntSupportAllScreens_usesCompatMode() {
+        setGlobalCompatibilityMode(true);
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.CUPCAKE, 0 /*flags*/);
+        assertThat(info.usesCompatibilityMode(), is(true));
+    }
+
+    @Test
+    public void testGlobalCompatModeDisabled_oldApp_supportAllScreens_usesCompatMode() {
+        setGlobalCompatibilityMode(false);
+        final int flags = (FLAG_SUPPORTS_LARGE_SCREENS | FLAG_SUPPORTS_NORMAL_SCREENS
+                | FLAG_SUPPORTS_SMALL_SCREENS | FLAG_RESIZEABLE_FOR_SCREENS
+                | FLAG_SUPPORTS_SCREEN_DENSITIES | FLAG_SUPPORTS_XLARGE_SCREENS);
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.CUPCAKE, flags);
+        assertThat(info.usesCompatibilityMode(), is(true));
+    }
+
+    @Test
+    public void testGlobalCompatModeDisabled_oldApp_supportSomeScreens_usesCompatMode() {
+        setGlobalCompatibilityMode(false);
+        final int flags = (FLAG_SUPPORTS_LARGE_SCREENS
+                | FLAG_SUPPORTS_SMALL_SCREENS | FLAG_RESIZEABLE_FOR_SCREENS
+                | FLAG_SUPPORTS_SCREEN_DENSITIES | FLAG_SUPPORTS_XLARGE_SCREENS);
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.CUPCAKE, flags);
+        assertThat(info.usesCompatibilityMode(), is(true));
+    }
+
+    @Test
+    public void testGlobalCompatModeDisabled_oldApp_supportOnlyOneScreen_usesCompatMode() {
+        setGlobalCompatibilityMode(false);
+        final int flags = FLAG_SUPPORTS_NORMAL_SCREENS;
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.CUPCAKE, flags);
+        assertThat(info.usesCompatibilityMode(), is(true));
+    }
+
+    @Test
+    public void testGlobalCompatModeDisabled_oldApp_doesntSupportAllScreens_usesCompatMode() {
+        setGlobalCompatibilityMode(false);
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.CUPCAKE, 0 /*flags*/);
+        assertThat(info.usesCompatibilityMode(), is(true));
+    }
+
+    // The following tests ensure that apps with newer target SDK use compat mode as expected.
+
+    @Test
+    public void testGlobalCompatModeEnabled_newApp_supportAllScreens_doesntUseCompatMode() {
+        setGlobalCompatibilityMode(true);
+        final int flags = (FLAG_SUPPORTS_LARGE_SCREENS | FLAG_SUPPORTS_NORMAL_SCREENS
+                | FLAG_SUPPORTS_SMALL_SCREENS | FLAG_RESIZEABLE_FOR_SCREENS
+                | FLAG_SUPPORTS_SCREEN_DENSITIES | FLAG_SUPPORTS_XLARGE_SCREENS);
+        final ApplicationInfo info = generateMockApplicationInfo(Build.VERSION_CODES.DONUT, flags);
+        assertThat(info.usesCompatibilityMode(), is(false));
+    }
+
+    @Test
+    public void testGlobalCompatModeEnabled_newApp_supportSomeScreens_doesntUseCompatMode() {
+        setGlobalCompatibilityMode(true);
+        final int flags = (FLAG_SUPPORTS_LARGE_SCREENS
+                | FLAG_SUPPORTS_SMALL_SCREENS | FLAG_RESIZEABLE_FOR_SCREENS
+                | FLAG_SUPPORTS_SCREEN_DENSITIES | FLAG_SUPPORTS_XLARGE_SCREENS);
+        final ApplicationInfo info = generateMockApplicationInfo(Build.VERSION_CODES.DONUT, flags);
+        assertThat(info.usesCompatibilityMode(), is(false));
+    }
+
+    @Test
+    public void testGlobalCompatModeEnabled_newApp_supportOnlyOneScreen_doesntUseCompatMode() {
+        setGlobalCompatibilityMode(true);
+        final int flags = FLAG_SUPPORTS_NORMAL_SCREENS;
+        final ApplicationInfo info = generateMockApplicationInfo(Build.VERSION_CODES.DONUT, flags);
+        assertThat(info.usesCompatibilityMode(), is(false));
+    }
+
+    @Test
+    public void testGlobalCompatModeEnabled_newApp_doesntSupportAllScreens_usesCompatMode() {
+        setGlobalCompatibilityMode(true);
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.DONUT, 0 /*flags*/);
+        assertThat(info.usesCompatibilityMode(), is(true));
+    }
+
+    @Test
+    public void testGlobalCompatModeDisabled_newApp_supportAllScreens_doesntUseCompatMode() {
+        setGlobalCompatibilityMode(false);
+        final int flags = (FLAG_SUPPORTS_LARGE_SCREENS | FLAG_SUPPORTS_NORMAL_SCREENS
+                | FLAG_SUPPORTS_SMALL_SCREENS | FLAG_RESIZEABLE_FOR_SCREENS
+                | FLAG_SUPPORTS_SCREEN_DENSITIES | FLAG_SUPPORTS_XLARGE_SCREENS);
+        final ApplicationInfo info = generateMockApplicationInfo(Build.VERSION_CODES.DONUT, flags);
+        assertThat(info.usesCompatibilityMode(), is(false));
+    }
+
+    @Test
+    public void testGlobalCompatModeDisabled_newApp_supportSomeScreens_doesntUseCompatMode() {
+        setGlobalCompatibilityMode(false);
+        final int flags = (FLAG_SUPPORTS_LARGE_SCREENS
+                | FLAG_SUPPORTS_SMALL_SCREENS | FLAG_RESIZEABLE_FOR_SCREENS
+                | FLAG_SUPPORTS_SCREEN_DENSITIES | FLAG_SUPPORTS_XLARGE_SCREENS);
+        final ApplicationInfo info = generateMockApplicationInfo(Build.VERSION_CODES.DONUT, flags);
+        assertThat(info.usesCompatibilityMode(), is(false));
+    }
+
+    @Test
+    public void testGlobalCompatModeDisabled_newApp_supportOnlyOneScreen_doesntUseCompatMode() {
+        setGlobalCompatibilityMode(false);
+        final int flags = FLAG_SUPPORTS_NORMAL_SCREENS;
+        final ApplicationInfo info = generateMockApplicationInfo(Build.VERSION_CODES.DONUT, flags);
+        assertThat(info.usesCompatibilityMode(), is(false));
+    }
+
+    @Test
+    public void testGlobalCompatModeDisabled_newApp_doesntSupportAllScreens_doesntUseCompatMode() {
+        setGlobalCompatibilityMode(false);
+        final ApplicationInfo info =
+                generateMockApplicationInfo(Build.VERSION_CODES.DONUT, 0 /*flags*/);
+        assertThat(info.usesCompatibilityMode(), is(false));
+    }
+
+    private ApplicationInfo generateMockApplicationInfo(int targetSdkVersion, int flags) {
+        final ApplicationInfo info = new ApplicationInfo();
+        info.targetSdkVersion = targetSdkVersion;
+        info.flags |= flags;
+        when(mMockAndroidPackage.toAppInfoWithoutState()).thenReturn(info);
+        return PackageInfoWithoutStateUtils.generateApplicationInfoUnchecked(mMockAndroidPackage,
+                0 /*flags*/, mMockUserState, 0 /*userId*/, false /*assignUserFields*/);
+    }
+
+    private void setGlobalCompatibilityMode(boolean enabled) {
+        if (PackageParser.sCompatibilityModeEnabled == enabled) {
+            return;
+        }
+        PackageParser.setCompatibilityModeEnabled(enabled);
+    }
+}