diff --git a/tools/aconfig/aconfig_device_paths/Android.bp b/tools/aconfig/aconfig_device_paths/Android.bp
index bdf96ed..c75a12a 100644
--- a/tools/aconfig/aconfig_device_paths/Android.bp
+++ b/tools/aconfig/aconfig_device_paths/Android.bp
@@ -73,3 +73,23 @@
     name: "aconfig_host_device_paths_java",
     srcs: [":libaconfig_java_host_device_paths_src"],
 }
+
+genrule {
+    name: "java_device_paths_test_util_src",
+    srcs: ["src/DeviceProtosTestUtilTemplate.java"],
+    out: ["DeviceProtosTestUtil.java"],
+    tool_files: ["partition_aconfig_flags_paths.txt"],
+    cmd: "sed -e '/TEMPLATE/{r$(location partition_aconfig_flags_paths.txt)' -e 'd}' $(in) > $(out)",
+}
+
+java_library {
+    name: "aconfig_device_paths_java_util",
+    srcs: [":java_device_paths_test_util_src"],
+    static_libs: [
+        "libaconfig_java_proto_nano",
+    ],
+    sdk_version: "core_platform",
+    apex_available: [
+        "//apex_available:platform",
+    ],
+}
diff --git a/tools/aconfig/aconfig_device_paths/src/DeviceProtosTestUtilTemplate.java b/tools/aconfig/aconfig_device_paths/src/DeviceProtosTestUtilTemplate.java
new file mode 100644
index 0000000..1c5f5f0
--- /dev/null
+++ b/tools/aconfig/aconfig_device_paths/src/DeviceProtosTestUtilTemplate.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2024 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.aconfig;
+
+import android.aconfig.nano.Aconfig.parsed_flag;
+import android.aconfig.nano.Aconfig.parsed_flags;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/** @hide */
+public class DeviceProtosTestUtil {
+    public static final String[] PATHS = {
+        TEMPLATE
+    };
+
+    private static final String APEX_DIR = "/apex/";
+    private static final String APEX_ACONFIG_PATH_SUFFIX = "/etc/aconfig_flags.pb";
+    private static final String SYSTEM_APEX_DIR = "/system/apex";
+
+    /**
+     * Returns a list of all on-device aconfig protos.
+     *
+     * <p>May throw an exception if the protos can't be read at the call site. For example, some of
+     * the protos are in the apex/ partition, which is mounted somewhat late in the boot process.
+     *
+     * @throws IOException if we can't read one of the protos yet
+     * @return a list of all on-device aconfig protos
+     */
+    public static List<parsed_flag> loadAndParseFlagProtos() throws IOException {
+        ArrayList<parsed_flag> result = new ArrayList();
+
+        for (String path : parsedFlagsProtoPaths()) {
+            try (FileInputStream inputStream = new FileInputStream(path)) {
+                parsed_flags parsedFlags = parsed_flags.parseFrom(inputStream.readAllBytes());
+                for (parsed_flag flag : parsedFlags.parsedFlag) {
+                    result.add(flag);
+                }
+            }
+        }
+
+        return result;
+    }
+
+    /**
+     * Returns the list of all on-device aconfig protos paths.
+     *
+     * @hide
+     */
+    public static List<String> parsedFlagsProtoPaths() {
+        ArrayList<String> paths = new ArrayList(Arrays.asList(PATHS));
+
+        File apexDirectory = new File(SYSTEM_APEX_DIR);
+        if (!apexDirectory.isDirectory()) {
+            return paths;
+        }
+
+        File[] subdirs = apexDirectory.listFiles();
+        if (subdirs == null) {
+            return paths;
+        }
+
+        for (File prefix : subdirs) {
+            // For each mainline modules, there are two directories, one <modulepackage>/,
+            // and one <modulepackage>@<versioncode>/. Just read the former.
+            if (!prefix.getAbsolutePath().endsWith(".apex")) {
+                continue;
+            }
+
+            String apexName = prefix.getName();
+            apexName = apexName.substring(0, apexName.length() - 5);
+
+            File protoPath = new File(APEX_DIR + apexName + APEX_ACONFIG_PATH_SUFFIX);
+            if (!protoPath.exists()) {
+                continue;
+            }
+
+            paths.add(protoPath.getAbsolutePath());
+        }
+        return paths;
+    }
+}
diff --git a/tools/aconfig/aconfig_device_paths/test/Android.bp b/tools/aconfig/aconfig_device_paths/test/Android.bp
new file mode 100644
index 0000000..37f561f
--- /dev/null
+++ b/tools/aconfig/aconfig_device_paths/test/Android.bp
@@ -0,0 +1,35 @@
+// Copyright (C) 2024 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 {
+    default_team: "trendy_team_android_core_experiments",
+    default_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+android_test {
+    name: "aconfig_device_paths_java_test",
+    srcs: [
+        "src/**/*.java",
+    ],
+    static_libs: [
+        "androidx.test.runner",
+        "junit",
+        "aconfig_device_paths_java_util",
+    ],
+    test_suites: [
+        "general-tests",
+    ],
+    platform_apis: true,
+    certificate: "platform",
+}
diff --git a/tools/aconfig/aconfig_device_paths/test/AndroidManifest.xml b/tools/aconfig/aconfig_device_paths/test/AndroidManifest.xml
new file mode 100644
index 0000000..5e01879
--- /dev/null
+++ b/tools/aconfig/aconfig_device_paths/test/AndroidManifest.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2024 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.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="android.aconfig.storage.test">
+    <application>
+        <uses-library android:name="android.test.runner" />
+    </application>
+
+    <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
+                     android:targetPackage="android.aconfig.storage.test" />
+
+</manifest>
diff --git a/tools/aconfig/aconfig_device_paths/test/src/DeviceProtosTestUtilTest.java b/tools/aconfig/aconfig_device_paths/test/src/DeviceProtosTestUtilTest.java
new file mode 100644
index 0000000..8829822
--- /dev/null
+++ b/tools/aconfig/aconfig_device_paths/test/src/DeviceProtosTestUtilTest.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2024 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.aconfig.test;
+
+import static org.junit.Assert.assertTrue;
+
+import android.aconfig.DeviceProtosTestUtil;
+import android.aconfig.nano.Aconfig.parsed_flag;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import java.util.List;
+import java.util.Set;
+
+@RunWith(JUnit4.class)
+public class DeviceProtosTestUtilTest {
+
+    private static final Set<String> PLATFORM_CONTAINERS = Set.of("system", "vendor", "product");
+
+    @Test
+    public void testDeviceProtos_loadAndParseFlagProtos() throws Exception {
+        List<parsed_flag> flags = DeviceProtosTestUtil.loadAndParseFlagProtos();
+        int platformFlags = 0;
+        int mainlineFlags = 0;
+        for (parsed_flag pf : flags) {
+            if (PLATFORM_CONTAINERS.contains(pf.container)) {
+                platformFlags++;
+            } else {
+                mainlineFlags++;
+            }
+        }
+
+        assertTrue(platformFlags > 0);
+        assertTrue(mainlineFlags > 0);
+    }
+}