Add host side test for apex-system-service.

The test installs a test apex with a fake system server and checks that
the service prints to logcat in onStart().

Bug: 192880996
Test: atest ApexSystemServicesTestCases
Change-Id: I7b9f353e30425302e83660f440affe5010944a9b

TEST_MAPPING

@@ -16,6 +16,19 @@
     }
   ],
   "presubmit": [
+    {
+      "file_patterns": [
+        "ApexManager\\.java",
+        "SystemServer\\.java",
+        "services/tests/apexsystemservices/.*"
+      ],
+      "name": "ApexSystemServicesTestCases",
+      "options": [
+        {
+          "exclude-annotation": "androidx.test.filters.FlakyTest"
+        }
+      ]
+    },
     {
       "name": "FrameworksUiServicesTests",
       "options": [

services/tests/apexsystemservices/Android.bp

@@ -0,0 +1,41 @@
+/*
+ * 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 {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "frameworks_base_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["frameworks_base_license"],
+}
+
+java_test_host {
+    name: "ApexSystemServicesTestCases",
+    srcs: ["src/**/*.java"],
+    libs: ["tradefed"],
+    java_resources: [
+        ":test_com.android.server",
+    ],
+    static_libs: [
+        "compatibility-host-util",
+        "cts-install-lib-host",
+        "frameworks-base-hostutils",
+        "truth-prebuilt",
+        "modules-utils-build-testing",
+    ],
+    test_suites: ["device-tests"],
+}

services/tests/apexsystemservices/AndroidTest.xml

@@ -0,0 +1,24 @@
+<!--
+  ~ 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.
+  -->
+
+<configuration description="Tests for apex-system-service support">
+    <option name="config-descriptor:metadata" key="component" value="misc" />
+    <option name="config-descriptor:metadata" key="parameter" value="not_instant_app" />
+    <option name="config-descriptor:metadata" key="parameter" value="not_multi_abi" />
+    <test class="com.android.compatibility.common.tradefed.testtype.JarHostTest" >
+        <option name="jar" value="ApexSystemServicesTestCases.jar" />
+    </test>
+</configuration>

services/tests/apexsystemservices/src/com/android/server/ApexSystemServicesTestCases.java

@@ -0,0 +1,94 @@
+/*
+ * 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;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import static org.junit.Assume.assumeTrue;
+
+import android.cts.install.lib.host.InstallUtilsHost;
+
+import com.android.internal.util.test.SystemPreparer;
+import com.android.modules.utils.build.testing.DeviceSdkLevel;
+import com.android.tradefed.device.DeviceNotAvailableException;
+import com.android.tradefed.device.ITestDevice;
+import com.android.tradefed.testtype.DeviceJUnit4ClassRunner;
+import com.android.tradefed.testtype.junit4.BaseHostJUnit4Test;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.RuleChain;
+import org.junit.rules.TemporaryFolder;
+import org.junit.runner.RunWith;
+
+@RunWith(DeviceJUnit4ClassRunner.class)
+public class ApexSystemServicesTestCases extends BaseHostJUnit4Test {
+
+    private final InstallUtilsHost mHostUtils = new InstallUtilsHost(this);
+    private final TemporaryFolder mTemporaryFolder = new TemporaryFolder();
+    private final SystemPreparer mPreparer = new SystemPreparer(mTemporaryFolder, this::getDevice);
+
+    @Rule
+    public final RuleChain ruleChain = RuleChain.outerRule(mTemporaryFolder).around(mPreparer);
+
+    private DeviceSdkLevel mDeviceSdkLevel;
+    private ITestDevice mDevice;
+
+    @Before
+    public void setup() throws Exception {
+        mDevice = getDevice();
+        mDeviceSdkLevel = new DeviceSdkLevel(getDevice());
+
+        assumeTrue(mDeviceSdkLevel.isDeviceAtLeastT());
+
+        assertThat(mDevice.enableAdbRoot()).isTrue();
+        assertThat(mHostUtils.isApexUpdateSupported()).isTrue();
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        mDevice.disableAdbRoot();
+    }
+
+    @Test
+    public void noApexSystemServerStartsWithoutApex() throws Exception {
+        mPreparer.reboot();
+
+        assertThat(getFakeApexSystemServiceLogcat())
+                .doesNotContain("FakeApexSystemService onStart");
+    }
+
+    @Test
+    public void apexSystemServerStarts() throws Exception {
+        // Pre-install the apex
+        String apex = "test_com.android.server.apex";
+        mPreparer.pushResourceFile(apex, "/system/apex/" + apex);
+        // Reboot activates the apex
+        mPreparer.reboot();
+
+        assertThat(getFakeApexSystemServiceLogcat())
+                .contains("FakeApexSystemService onStart");
+    }
+
+    private String getFakeApexSystemServiceLogcat() throws DeviceNotAvailableException {
+        return mDevice.executeAdbCommand("logcat", "-v", "brief", "-d", "FakeApexSystemService:D",
+                "*:S");
+    }
+
+}