Add tests for preload and APEX measurement

A new host-side test "BinaryTransparencyHostTest" is added to drive the
actual test on device. The host can be used to set up the testing
environment (e.g. update a preload, or later install MBA), then ask the
helper app "BinaryTransparencyTestApp" to verify returned value of
private APIs in the main service.

Since the APIs are private (@hide, because we're not ready to make
anything public yet), the (bundled) helper app needs to be compiled with
`platform_apis: true`.

Plus, since the service is not accessible to apps by sepolicy, the test
has to run with SELinux disabled. An alternative is to add a
userdebug_or_eng rule in sepolicy, but it's better to avoid adding rule
for one specific test, and isolate the setup here (in AndroidTest.xml).

The test is not yet added to TEST_MAPPING/presubmit. Once it runs
successfully for a few runs in postsubmit, we should graduate it to
presubmit.

Test: atest BinaryTransparencyHostTest
Test: atest BinaryTransparencyServiceTest
Bug: 265244016
Change-Id: Ibd87f4cf6a2ae989ddfa8eaf9494cff5d34005ed

1 files changed, 77 insertions, 0 deletions

diff --git a/tests/BinaryTransparencyHostTest/src/android/transparency/test/BinaryTransparencyHostTest.java b/tests/BinaryTransparencyHostTest/src/android/transparency/test/BinaryTransparencyHostTest.java
new file mode 100644
index 000000000000..84bed92f5117
--- /dev/null
+++ b/tests/BinaryTransparencyHostTest/src/android/transparency/test/BinaryTransparencyHostTest.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2023 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.transparency.test;
+
+import static org.junit.Assert.assertTrue;
+
+import com.android.tradefed.device.DeviceNotAvailableException;
+import com.android.tradefed.testtype.DeviceJUnit4ClassRunner;
+import com.android.tradefed.testtype.junit4.BaseHostJUnit4Test;
+import com.android.tradefed.testtype.junit4.DeviceTestRunOptions;
+import com.android.tradefed.util.CommandResult;
+import com.android.tradefed.util.CommandStatus;
+
+import org.junit.After;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+// TODO: Add @Presubmit
+@RunWith(DeviceJUnit4ClassRunner.class)
+public final class BinaryTransparencyHostTest extends BaseHostJUnit4Test {
+    private static final String PACKAGE_NAME = "android.transparency.test.app";
+
+    @After
+    public void tearDown() throws Exception {
+        uninstallPackage("com.android.egg");
+    }
+
+    @Test
+    public void testCollectAllApexInfo() throws Exception {
+        var options = new DeviceTestRunOptions(PACKAGE_NAME);
+        options.setTestClassName(PACKAGE_NAME + ".BinaryTransparencyTest");
+        options.setTestMethodName("testCollectAllApexInfo");
+
+        // Collect APEX package names from /apex, then pass them as expectation to be verified.
+        CommandResult result = getDevice().executeShellV2Command(
+                "ls -d /apex/*/ |grep -v @ |grep -v /apex/sharedlibs |cut -d/ -f3");
+        assertTrue(result.getStatus() == CommandStatus.SUCCESS);
+        String[] packageNames = result.getStdout().split("\n");
+        for (var i = 0; i < packageNames.length; i++) {
+            options.addInstrumentationArg("apex-" + String.valueOf(i), packageNames[i]);
+        }
+        options.addInstrumentationArg("apex-number", Integer.toString(packageNames.length));
+        runDeviceTests(options);
+    }
+
+    @Test
+    public void testCollectAllUpdatedPreloadInfo() throws Exception {
+        installPackage("EasterEgg.apk");
+        runDeviceTest("testCollectAllUpdatedPreloadInfo");
+    }
+
+    @Test
+    public void testMeasureMbas() throws Exception {
+        // TODO(265244016): figure out a way to install an MBA
+    }
+
+    private void runDeviceTest(String method) throws DeviceNotAvailableException {
+        var options = new DeviceTestRunOptions(PACKAGE_NAME);
+        options.setTestClassName(PACKAGE_NAME + ".BinaryTransparencyTest");
+        options.setTestMethodName(method);
+        runDeviceTests(options);
+    }
+}