Add CTS for DnsOptions API

Bug: 251012627
Test: atest CtsNetHttpTestCases
Change-Id: Ic048a842e1f491d47c92b51ac05f55cec60eeda6
diff --git a/Cronet/tests/cts/src/android/net/http/cts/DnsOptionsTest.kt b/Cronet/tests/cts/src/android/net/http/cts/DnsOptionsTest.kt
new file mode 100644
index 0000000..65cf8fb
--- /dev/null
+++ b/Cronet/tests/cts/src/android/net/http/cts/DnsOptionsTest.kt
@@ -0,0 +1,46 @@
+/*
+ * 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.net.http.cts
+
+import android.net.http.DnsOptions
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import java.time.Duration
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertNotNull
+import kotlin.test.assertTrue
+import org.junit.runner.RunWith
+
+@RunWith(AndroidJUnit4::class)
+class DnsOptionsTest {
+
+    @Test
+    fun testDnsOptions_persistHostCache_returnSetValue() {
+        val options = DnsOptions.Builder().setPersistHostCache(true).build()
+
+        assertNotNull(options.persistHostCache)
+        assertTrue(options.persistHostCache!!)
+    }
+
+    @Test
+    fun testDnsOptions_persistHostCachePeriod_returnSetValue() {
+        val period = Duration.ZERO
+        val options = DnsOptions.Builder().setPersistHostCachePeriod(period).build()
+
+        assertEquals(period, options.persistHostCachePeriod)
+    }
+}