diff --git a/tests/Android.bp b/tests/Android.bp
index 9583bfd..18fc473 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -25,4 +25,6 @@
     "pointer/1.0",
     "pointer/1.0/default",
     "pointer/1.0/default/lib",
+    "trie/1.0",
+    "trie/1.0/default",
 ]
diff --git a/tests/trie/1.0/Android.bp b/tests/trie/1.0/Android.bp
new file mode 100644
index 0000000..fcc4325
--- /dev/null
+++ b/tests/trie/1.0/Android.bp
@@ -0,0 +1,66 @@
+// This file is autogenerated by hidl-gen. Do not edit manually.
+
+filegroup {
+    name: "android.hardware.tests.trie@1.0_hal",
+    srcs: [
+        "types.hal",
+        "ITrie.hal",
+    ],
+}
+
+genrule {
+    name: "android.hardware.tests.trie@1.0_genc++",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++-sources -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.tests.trie@1.0",
+    srcs: [
+        ":android.hardware.tests.trie@1.0_hal",
+    ],
+    out: [
+        "android/hardware/tests/trie/1.0/types.cpp",
+        "android/hardware/tests/trie/1.0/TrieAll.cpp",
+    ],
+}
+
+genrule {
+    name: "android.hardware.tests.trie@1.0_genc++_headers",
+    tools: ["hidl-gen"],
+    cmd: "$(location hidl-gen) -o $(genDir) -Lc++-headers -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.tests.trie@1.0",
+    srcs: [
+        ":android.hardware.tests.trie@1.0_hal",
+    ],
+    out: [
+        "android/hardware/tests/trie/1.0/types.h",
+        "android/hardware/tests/trie/1.0/hwtypes.h",
+        "android/hardware/tests/trie/1.0/ITrie.h",
+        "android/hardware/tests/trie/1.0/IHwTrie.h",
+        "android/hardware/tests/trie/1.0/BnHwTrie.h",
+        "android/hardware/tests/trie/1.0/BpHwTrie.h",
+        "android/hardware/tests/trie/1.0/BsTrie.h",
+    ],
+}
+
+cc_library {
+    name: "android.hardware.tests.trie@1.0",
+    defaults: ["hidl-module-defaults"],
+    generated_sources: ["android.hardware.tests.trie@1.0_genc++"],
+    generated_headers: ["android.hardware.tests.trie@1.0_genc++_headers"],
+    export_generated_headers: ["android.hardware.tests.trie@1.0_genc++_headers"],
+    vendor_available: true,
+    vndk: {
+        enabled: true,
+    },
+    shared_libs: [
+        "libhidlbase",
+        "libhidltransport",
+        "libhwbinder",
+        "liblog",
+        "libutils",
+        "libcutils",
+    ],
+    export_shared_lib_headers: [
+        "libhidlbase",
+        "libhidltransport",
+        "libhwbinder",
+        "libutils",
+    ],
+}
diff --git a/tests/trie/1.0/ITrie.hal b/tests/trie/1.0/ITrie.hal
new file mode 100644
index 0000000..5d009ca
--- /dev/null
+++ b/tests/trie/1.0/ITrie.hal
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2017 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.hardware.tests.trie@1.0;
+
+interface ITrie {
+    newTrie() generates (TrieNode trie);
+    addStrings(TrieNode trie, vec<string> strings) generates (TrieNode trie);
+    containsStrings(TrieNode trie, vec<string> strings) generates (vec<bool> contains);
+};
diff --git a/tests/trie/1.0/default/Android.bp b/tests/trie/1.0/default/Android.bp
new file mode 100644
index 0000000..315c8bb
--- /dev/null
+++ b/tests/trie/1.0/default/Android.bp
@@ -0,0 +1,16 @@
+cc_library_shared {
+    name: "android.hardware.tests.trie@1.0-impl",
+    defaults: ["hidl_defaults"],
+    relative_install_path: "hw",
+    srcs: [
+        "Trie.cpp",
+    ],
+    shared_libs: [
+        "libbase",
+        "libhidlbase",
+        "libhidltransport",
+        "liblog",
+        "libutils",
+        "android.hardware.tests.trie@1.0",
+    ],
+}
diff --git a/tests/trie/1.0/default/Trie.cpp b/tests/trie/1.0/default/Trie.cpp
new file mode 100644
index 0000000..c81c508
--- /dev/null
+++ b/tests/trie/1.0/default/Trie.cpp
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#define LOG_TAG "hidl_test"
+
+#include "Trie.h"
+#include <android-base/logging.h>
+#include <inttypes.h>
+#include <string>
+
+namespace android {
+namespace hardware {
+namespace tests {
+namespace trie {
+namespace V1_0 {
+namespace implementation {
+
+// Methods from ::android::hardware::tests::trie::V1_0::ITrie follow.
+Return<void> Trie::newTrie(newTrie_cb _hidl_cb) {
+    LOG(INFO) << "SERVER(Trie) newTrie()";
+
+    TrieNode ret;
+    ret.isTerminal = false;
+    _hidl_cb(ret);
+    return Void();
+}
+
+Return<void> Trie::addStrings(const TrieNode& trie, const hidl_vec<hidl_string>& strings,
+                              addStrings_cb _hidl_cb) {
+    LOG(INFO) << "SERVER(Trie) addStrings(trie, " << strings.size() << " strings)";
+
+    // Make trie modifiable.
+    TrieNode newTrie = trie;
+
+    for (const auto& str : strings) {
+        addString(&newTrie, str);
+    }
+    _hidl_cb(newTrie);
+    return Void();
+}
+
+Return<void> Trie::containsStrings(const TrieNode& trie, const hidl_vec<hidl_string>& strings,
+                                   containsStrings_cb _hidl_cb) {
+    LOG(INFO) << "SERVER(Trie) containsStrings(trie, " << strings.size() << " strings)";
+
+    std::vector<bool> ret(strings.size());
+    for (size_t i = 0; i != strings.size(); ++i) {
+        ret[i] = containsString(&trie, strings[i]);
+    }
+    _hidl_cb(ret);
+    return Void();
+}
+
+void Trie::addString(TrieNode* trieRoot, const std::string& str) {
+    TrieNode* currNode = trieRoot;
+
+    for (char ch : str) {
+        auto& vec = currNode->next;
+
+        auto it = std::find_if(vec.begin(), vec.end(),
+                               [&](const TrieEdge& edge) { return ch == edge.character; });
+
+        if (it == vec.end()) {
+            vec.resize(vec.size() + 1);
+            it = vec.end() - 1;
+            it->character = ch;
+            it->node.isTerminal = false;
+        }
+
+        currNode = &(it->node);
+    }
+
+    currNode->isTerminal = true;
+}
+
+bool Trie::containsString(const TrieNode* trieRoot, const std::string& str) {
+    const TrieNode* currNode = trieRoot;
+
+    for (char ch : str) {
+        const auto& vec = currNode->next;
+
+        auto it = std::find_if(vec.begin(), vec.end(),
+                               [&](const TrieEdge& edge) { return ch == edge.character; });
+
+        if (it == vec.end()) return false;
+        currNode = &(it->node);
+    }
+
+    return currNode->isTerminal;
+}
+
+ITrie* HIDL_FETCH_ITrie(const char* /* name */) {
+    return new Trie();
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace trie
+}  // namespace tests
+}  // namespace hardware
+}  // namespace android
diff --git a/tests/trie/1.0/default/Trie.h b/tests/trie/1.0/default/Trie.h
new file mode 100644
index 0000000..c2ef40b
--- /dev/null
+++ b/tests/trie/1.0/default/Trie.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2017 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.
+ */
+
+#ifndef ANDROID_HARDWARE_TESTS_TRIE_V1_0_TRIE_H
+#define ANDROID_HARDWARE_TESTS_TRIE_V1_0_TRIE_H
+
+#include <android/hardware/tests/trie/1.0/ITrie.h>
+#include <hidl/Status.h>
+
+#include <string>
+
+namespace android {
+namespace hardware {
+namespace tests {
+namespace trie {
+namespace V1_0 {
+namespace implementation {
+
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::tests::trie::V1_0::ITrie;
+using ::android::hardware::tests::trie::V1_0::TrieNode;
+
+struct Trie : public ITrie {
+    // Methods from ::android::hardware::tests::trie::V1_0::ITrie follow.
+    virtual Return<void> newTrie(newTrie_cb _hidl_cb) override;
+    virtual Return<void> addStrings(const TrieNode& trie, const hidl_vec<hidl_string>& strings,
+                                    addStrings_cb _hidl_cb) override;
+    virtual Return<void> containsStrings(const TrieNode& trie, const hidl_vec<hidl_string>& strings,
+                                         containsStrings_cb _hidl_cb) override;
+
+   private:
+    void addString(TrieNode* trieRoot, const std::string& str);
+    bool containsString(const TrieNode* trieRoot, const std::string& str);
+};
+
+extern "C" ITrie* HIDL_FETCH_ITrie(const char* name);
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace trie
+}  // namespace tests
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_TESTS_TRIE_V1_0_TRIE_H
diff --git a/tests/trie/1.0/types.hal b/tests/trie/1.0/types.hal
new file mode 100644
index 0000000..28c502b
--- /dev/null
+++ b/tests/trie/1.0/types.hal
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2017 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.hardware.tests.trie@1.0;
+
+struct TrieNode {
+    vec<TrieEdge> next;
+    bool isTerminal;
+};
+
+struct TrieEdge {
+    int8_t character;
+    TrieNode node;
+};
+
+// Some forward reference tests.
+
+struct A {
+    ref<B> b;
+};
+
+struct B {
+    ref<A> a;
+};
+
+typedef ref<S> refS;
+struct S {
+    refS f;
+};
+
+enum E1 : int32_t {
+    OK = E2:ACCEPT + ANOTHER,
+    ANOTHER = 100,
+};
+
+enum E2 : E1 {
+    ACCEPT,
+};