add noop channel primer test

Change-Id: I2a11cd44ddd9caaea4db918f66aa7313a31a0057

Author: nicholsl

google-cloud-bigtable/src/test/java/com/google/cloud/bigtable/data/v2/stub/NoOpChannelPrimerTest.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * 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
+ *
+ * https://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.cloud.bigtable.data.v2.stub;
+
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verifyNoInteractions;
+
+import io.grpc.ManagedChannel;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class NoOpChannelPrimerTest {
+  @Test
+  public void primeChannelDoesNothing() {
+    // Create an instance of NoOpChannelPrimer
+    NoOpChannelPrimer primer = NoOpChannelPrimer.create();
+
+    // Create a mock ManagedChannel
+    ManagedChannel mockChannel = mock(ManagedChannel.class);
+
+    // Call the primeChannel method
+    primer.primeChannel(mockChannel);
+
+    // Verify that no interactions occurred with the mock channel.
+    // This confirms the "no-op" behavior.
+    verifyNoInteractions(mockChannel);
+  }
+}