Add instrumentation test for runtime API

Author: keyprocedure

extension/android/executorch_android/src/androidTest/java/org/pytorch/executorch/RuntimeInstrumentationTest.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package org.pytorch.executorch;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertNotNull;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import org.junit.runner.RunWith;
+import org.junit.Test;
+
+/** Unit tests for {@link Runtime}. */
+@RunWith(AndroidJUnit4.class)
+public class RuntimeInstrumentationTest {
+
+    @Test
+    public void testRuntimeApi() {
+        assertTrue(Runtime.isInitialized());
+
+        String[] ops = Runtime.getRegisteredOps();
+        String[] backends = Runtime.getRegisteredBackends();
+
+        assertNotNull(ops);
+        assertNotNull(backends);
+
+        for (String op : ops) {
+            assertNotNull(op);
+        }
+
+        for (String backend : backends) {
+            assertNotNull(backend);
+        }
+    }
+}