diff --git a/libs/appfunctions/tests/Android.bp b/libs/appfunctions/tests/Android.bp
new file mode 100644
index 0000000..6f5eff3
--- /dev/null
+++ b/libs/appfunctions/tests/Android.bp
@@ -0,0 +1,41 @@
+// 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_applicable_licenses: ["Android-Apache-2.0"],
+}
+
+android_test {
+    name: "AppFunctionsSidecarTestCases",
+    team: "trendy_team_system_intelligence",
+    static_libs: [
+        "androidx.test.runner",
+        "androidx.test.rules",
+        "androidx.test.ext.junit",
+        "androidx.core_core-ktx",
+        "com.google.android.appfunctions.sidecar.impl",
+        "junit",
+        "kotlin-test",
+        "mockito-target-extended-minus-junit4",
+        "platform-test-annotations",
+        "testables",
+        "testng",
+        "truth",
+    ],
+    srcs: [
+        "src/**/*.java",
+        "src/**/*.kt",
+    ],
+}
diff --git a/libs/appfunctions/tests/AndroidManifest.xml b/libs/appfunctions/tests/AndroidManifest.xml
new file mode 100644
index 0000000..9a7d460
--- /dev/null
+++ b/libs/appfunctions/tests/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="com.google.android.appfunctions.sidecar.tests">
+    <application android:debuggable="true">
+        <uses-library android:name="android.test.mock" />
+        <uses-library android:name="android.test.runner" />
+    </application>
+    <instrumentation
+        android:name="androidx.test.runner.AndroidJUnitRunner"
+        android:targetPackage="com.google.android.appfunctions.sidecar.tests">
+    </instrumentation>
+</manifest>
diff --git a/libs/appfunctions/tests/AndroidTest.xml b/libs/appfunctions/tests/AndroidTest.xml
new file mode 100644
index 0000000..8251212
--- /dev/null
+++ b/libs/appfunctions/tests/AndroidTest.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.
+-->
+<configuration description="Config for AppFunctions Sidecar Tests">
+    <target_preparer class="com.android.tradefed.targetprep.suite.SuiteApkInstaller">
+        <option name="cleanup-apks" value="true" />
+        <option name="test-file-name" value="AppFunctionsSidecarTestCases.apk" />
+    </target_preparer>
+    <option name="test-tag" value="AppFunctionsSidecarTestCases" />
+    <test class="com.android.tradefed.testtype.AndroidJUnitTest" >
+        <option name="package" value="com.google.android.appfunctions.sidecar.tests" />
+        <option name="runner" value="androidx.test.runner.AndroidJUnitRunner" />
+        <option name="hidden-api-checks" value="false"/>
+    </test>
+</configuration>
diff --git a/libs/appfunctions/tests/src/com/google/android/appfunctions/sidecar/tests/SidecarConverterTest.kt b/libs/appfunctions/tests/src/com/google/android/appfunctions/sidecar/tests/SidecarConverterTest.kt
new file mode 100644
index 0000000..1f9fddd
--- /dev/null
+++ b/libs/appfunctions/tests/src/com/google/android/appfunctions/sidecar/tests/SidecarConverterTest.kt
@@ -0,0 +1,172 @@
+/*
+ * 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 com.google.android.appfunctions.sidecar.tests
+
+import android.app.appfunctions.ExecuteAppFunctionRequest
+import android.app.appfunctions.ExecuteAppFunctionResponse
+import android.app.appsearch.GenericDocument
+import android.os.Bundle
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.google.android.appfunctions.sidecar.SidecarConverter
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class SidecarConverterTest {
+    @Test
+    fun getSidecarExecuteAppFunctionRequest_sameContents() {
+        val extras = Bundle()
+        extras.putString("extra", "value")
+        val parameters: GenericDocument =
+            GenericDocument.Builder<GenericDocument.Builder<*>>("", "", "")
+                .setPropertyLong("testLong", 23)
+                .build()
+        val platformRequest: ExecuteAppFunctionRequest =
+            ExecuteAppFunctionRequest.Builder("targetPkg", "targetFunctionId")
+                .setExtras(extras)
+                .setParameters(parameters)
+                .build()
+
+        val sidecarRequest = SidecarConverter.getSidecarExecuteAppFunctionRequest(platformRequest)
+
+        assertThat(sidecarRequest.targetPackageName).isEqualTo("targetPkg")
+        assertThat(sidecarRequest.functionIdentifier).isEqualTo("targetFunctionId")
+        assertThat(sidecarRequest.parameters).isEqualTo(parameters)
+        assertThat(sidecarRequest.extras.size()).isEqualTo(1)
+        assertThat(sidecarRequest.extras.getString("extra")).isEqualTo("value")
+    }
+
+    @Test
+    fun getPlatformExecuteAppFunctionRequest_sameContents() {
+        val extras = Bundle()
+        extras.putString("extra", "value")
+        val parameters: GenericDocument =
+            GenericDocument.Builder<GenericDocument.Builder<*>>("", "", "")
+                .setPropertyLong("testLong", 23)
+                .build()
+        val sidecarRequest =
+            com.google.android.appfunctions.sidecar.ExecuteAppFunctionRequest.Builder(
+                "targetPkg",
+                "targetFunctionId"
+            )
+                .setExtras(extras)
+                .setParameters(parameters)
+                .build()
+
+        val platformRequest = SidecarConverter.getPlatformExecuteAppFunctionRequest(sidecarRequest)
+
+        assertThat(platformRequest.targetPackageName).isEqualTo("targetPkg")
+        assertThat(platformRequest.functionIdentifier).isEqualTo("targetFunctionId")
+        assertThat(platformRequest.parameters).isEqualTo(parameters)
+        assertThat(platformRequest.extras.size()).isEqualTo(1)
+        assertThat(platformRequest.extras.getString("extra")).isEqualTo("value")
+    }
+
+    @Test
+    fun getSidecarExecuteAppFunctionResponse_successResponse_sameContents() {
+        val resultGd: GenericDocument =
+            GenericDocument.Builder<GenericDocument.Builder<*>>("", "", "")
+                .setPropertyBoolean(ExecuteAppFunctionResponse.PROPERTY_RETURN_VALUE, true)
+                .build()
+        val platformResponse = ExecuteAppFunctionResponse.newSuccess(resultGd, null)
+
+        val sidecarResponse = SidecarConverter.getSidecarExecuteAppFunctionResponse(
+            platformResponse
+        )
+
+        assertThat(sidecarResponse.isSuccess).isTrue()
+        assertThat(
+            sidecarResponse.resultDocument.getProperty(
+                ExecuteAppFunctionResponse.PROPERTY_RETURN_VALUE
+            )
+        )
+            .isEqualTo(booleanArrayOf(true))
+        assertThat(sidecarResponse.resultCode).isEqualTo(ExecuteAppFunctionResponse.RESULT_OK)
+        assertThat(sidecarResponse.errorMessage).isNull()
+    }
+
+    @Test
+    fun getSidecarExecuteAppFunctionResponse_errorResponse_sameContents() {
+        val emptyGd = GenericDocument.Builder<GenericDocument.Builder<*>>("", "", "").build()
+        val platformResponse =
+            ExecuteAppFunctionResponse.newFailure(
+                ExecuteAppFunctionResponse.RESULT_INTERNAL_ERROR,
+                null,
+                null
+            )
+
+        val sidecarResponse = SidecarConverter.getSidecarExecuteAppFunctionResponse(
+            platformResponse
+        )
+
+        assertThat(sidecarResponse.isSuccess).isFalse()
+        assertThat(sidecarResponse.resultDocument.namespace).isEqualTo(emptyGd.namespace)
+        assertThat(sidecarResponse.resultDocument.id).isEqualTo(emptyGd.id)
+        assertThat(sidecarResponse.resultDocument.schemaType).isEqualTo(emptyGd.schemaType)
+        assertThat(sidecarResponse.resultCode)
+            .isEqualTo(ExecuteAppFunctionResponse.RESULT_INTERNAL_ERROR)
+        assertThat(sidecarResponse.errorMessage).isNull()
+    }
+
+    @Test
+    fun getPlatformExecuteAppFunctionResponse_successResponse_sameContents() {
+        val resultGd: GenericDocument =
+            GenericDocument.Builder<GenericDocument.Builder<*>>("", "", "")
+                .setPropertyBoolean(ExecuteAppFunctionResponse.PROPERTY_RETURN_VALUE, true)
+                .build()
+        val sidecarResponse = com.google.android.appfunctions.sidecar.ExecuteAppFunctionResponse
+            .newSuccess(resultGd, null)
+
+        val platformResponse = SidecarConverter.getPlatformExecuteAppFunctionResponse(
+            sidecarResponse
+        )
+
+        assertThat(platformResponse.isSuccess).isTrue()
+        assertThat(
+            platformResponse.resultDocument.getProperty(
+                ExecuteAppFunctionResponse.PROPERTY_RETURN_VALUE
+            )
+        )
+            .isEqualTo(booleanArrayOf(true))
+        assertThat(platformResponse.resultCode).isEqualTo(ExecuteAppFunctionResponse.RESULT_OK)
+        assertThat(platformResponse.errorMessage).isNull()
+    }
+
+    @Test
+    fun getPlatformExecuteAppFunctionResponse_errorResponse_sameContents() {
+        val emptyGd = GenericDocument.Builder<GenericDocument.Builder<*>>("", "", "").build()
+        val sidecarResponse =
+            com.google.android.appfunctions.sidecar.ExecuteAppFunctionResponse.newFailure(
+                ExecuteAppFunctionResponse.RESULT_INTERNAL_ERROR,
+                null,
+                null
+            )
+
+        val platformResponse = SidecarConverter.getPlatformExecuteAppFunctionResponse(
+            sidecarResponse
+        )
+
+        assertThat(platformResponse.isSuccess).isFalse()
+        assertThat(platformResponse.resultDocument.namespace).isEqualTo(emptyGd.namespace)
+        assertThat(platformResponse.resultDocument.id).isEqualTo(emptyGd.id)
+        assertThat(platformResponse.resultDocument.schemaType).isEqualTo(emptyGd.schemaType)
+        assertThat(platformResponse.resultCode)
+            .isEqualTo(ExecuteAppFunctionResponse.RESULT_INTERNAL_ERROR)
+        assertThat(platformResponse.errorMessage).isNull()
+    }
+}