diff --git a/tests/cts/net/Android.mk b/tests/cts/net/Android.mk
index a6543b3..83523cc 100644
--- a/tests/cts/net/Android.mk
+++ b/tests/cts/net/Android.mk
@@ -21,7 +21,7 @@
 # and when built explicitly put it in the data partition
 LOCAL_MODULE_PATH := $(TARGET_OUT_DATA_APPS)
 
-LOCAL_JAVA_LIBRARIES := android.test.runner voip-common
+LOCAL_JAVA_LIBRARIES := android.test.runner voip-common conscrypt
 
 LOCAL_JNI_SHARED_LIBRARIES := libnativedns_jni
 
diff --git a/tests/cts/net/src/android/net/http/cts/X509TrustManagerExtensionsTest.java b/tests/cts/net/src/android/net/http/cts/X509TrustManagerExtensionsTest.java
new file mode 100644
index 0000000..9c0d774
--- /dev/null
+++ b/tests/cts/net/src/android/net/http/cts/X509TrustManagerExtensionsTest.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2012 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.net.http.cts;
+
+import android.net.http.X509TrustManagerExtensions;
+import android.util.Base64;
+
+import java.io.File;
+import java.io.ByteArrayInputStream;
+
+import java.security.KeyStore;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+
+import junit.framework.TestCase;
+
+import com.android.org.conscrypt.TrustedCertificateStore;
+import com.android.org.conscrypt.TrustManagerImpl;
+
+public class X509TrustManagerExtensionsTest extends TestCase {
+
+    public void testIsUserAddedCert() throws Exception {
+        final String testCert =
+            "MIICfjCCAeegAwIBAgIJAMefIzKHY5H4MA0GCSqGSIb3DQEBBQUAMFgxCzAJBgNV" +
+            "BAYTAlVTMQswCQYDVQQIDAJDQTEWMBQGA1UEBwwNTW91bnRhaW4gVmlldzEPMA0G" +
+            "A1UECgwGR2V3Z3VsMRMwEQYDVQQDDApnZXdndWwuY29tMB4XDTEzMTEwNTAwNDE0" +
+            "MFoXDTEzMTIwNTAwNDE0MFowWDELMAkGA1UEBhMCVVMxCzAJBgNVBAgMAkNBMRYw" +
+            "FAYDVQQHDA1Nb3VudGFpbiBWaWV3MQ8wDQYDVQQKDAZHZXdndWwxEzARBgNVBAMM" +
+            "Cmdld2d1bC5jb20wgZ8wDQYJKoZIhvcNAQEBBQADgY0AMIGJAoGBAKpc/I0Ss4sm" +
+            "yV2iX5xRMM7+XXAhiWrceGair4MpvDrGIa1kFj2phtx4IqTfDnNU7AhRJYkDYmJQ" +
+            "fUJ8i6F+I08uNiGVO4DtPJbZcBXg9ME9EMaJCslm995ueeNWSw1Ky8zM0tt4p+94" +
+            "BcXJ7PC3N2WgkvtE8xwNbaeUfhGPzJKXAgMBAAGjUDBOMB0GA1UdDgQWBBQQ/iW7" +
+            "JCkSI2sbn4nTBiZ9PSiO8zAfBgNVHSMEGDAWgBQQ/iW7JCkSI2sbn4nTBiZ9PSiO" +
+            "8zAMBgNVHRMEBTADAQH/MA0GCSqGSIb3DQEBBQUAA4GBABQBrUOWTCSIl3vkRR3w" +
+            "3bPzh3BpqDmxH9xe4rZr+MVKKjpGjY1z2m2EEtyNz3tbgVQym5+si00DUHFL0IP1" +
+            "SuRULmPyEpTBVbV+PA5Kc967ZcDgYt4JtdMcCeKbIFaU6r8oEYEL2PTlNZmgbunM" +
+            "pXktkhVvNxZeSa8yM9bPhXkN";
+
+        CertificateFactory cf = CertificateFactory.getInstance("X.509");
+        X509Certificate cert = (X509Certificate)cf.generateCertificate(
+            new ByteArrayInputStream(Base64.decode(testCert, Base64.DEFAULT)));
+
+        // Test without adding cert to keystore.
+        KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
+        X509TrustManagerExtensions tmeNegative =
+            new X509TrustManagerExtensions(new TrustManagerImpl(keyStore));
+        assertEquals(false, tmeNegative.isUserAddedCertificate(cert));
+
+        // Test with cert added to keystore.
+        final File DIR_TEMP = new File(System.getProperty("java.io.tmpdir"));
+        final File DIR_TEST = new File(DIR_TEMP, "test");
+        final File system = new File(DIR_TEST, "system-test");
+        final File added = new File(DIR_TEST, "added-test");
+        final File deleted = new File(DIR_TEST, "deleted-test");
+
+        TrustedCertificateStore tcs = new TrustedCertificateStore(system, added, deleted);
+        added.mkdirs();
+        tcs.installCertificate(cert);
+        X509TrustManagerExtensions tmePositive =
+            new X509TrustManagerExtensions(new TrustManagerImpl(keyStore, null, tcs));
+        assertEquals(true, tmePositive.isUserAddedCertificate(cert));
+    }
+}