feat: add unit test for DeleteInstanceConfig.

Author: rajatbhatta

google-cloud-spanner/clirr-ignored-differences.xml

@@ -50,9 +50,29 @@
     <className>com/google/cloud/spanner/InstanceAdminClient</className>
     <method>com.google.api.gax.longrunning.OperationFuture createInstanceConfig(com.google.cloud.spanner.InstanceConfigInfo)</method>
   </difference>
+  <difference>
+    <differenceType>7012</differenceType>
+    <className>com/google/cloud/spanner/InstanceAdminClient</className>
+    <method>com.google.api.gax.longrunning.OperationFuture updateInstanceConfig(com.google.cloud.spanner.InstanceConfigInfo, com.google.cloud.spanner.InstanceConfigInfo$InstanceConfigField[])</method>
+  </difference>
+  <difference>
+    <differenceType>7012</differenceType>
+    <className>com/google/cloud/spanner/InstanceAdminClient</className>
+    <method>void deleteInstanceConfig(java.lang.String)</method>
+  </difference>
   <difference>
     <differenceType>7012</differenceType>
     <className>com/google/cloud/spanner/spi/v1/SpannerRpc</className>
     <method>com.google.api.gax.longrunning.OperationFuture createInstanceConfig(java.lang.String, java.lang.String, com.google.spanner.admin.instance.v1.InstanceConfig)</method>
   </difference>
+  <difference>
+    <differenceType>7012</differenceType>
+    <className>com/google/cloud/spanner/spi/v1/SpannerRpc</className>
+    <method>com.google.api.gax.longrunning.OperationFuture updateInstanceConfig(com.google.spanner.admin.instance.v1.InstanceConfig, com.google.protobuf.FieldMask)</method>
+  </difference>
+  <difference>
+    <differenceType>7012</differenceType>
+    <className>com/google/cloud/spanner/spi/v1/SpannerRpc</className>
+    <method>void deleteInstanceConfig(java.lang.String)</method>
+  </difference>
 </differences>

google-cloud-spanner/src/test/java/com/google/cloud/spanner/InstanceAdminClientImplTest.java

@@ -41,6 +41,7 @@
 import com.google.spanner.admin.instance.v1.CreateInstanceConfigMetadata;
 import com.google.spanner.admin.instance.v1.CreateInstanceMetadata;
 import com.google.spanner.admin.instance.v1.InstanceConfig;
+import com.google.spanner.admin.instance.v1.UpdateInstanceConfigMetadata;
 import com.google.spanner.admin.instance.v1.UpdateInstanceMetadata;
 import java.util.Arrays;
 import java.util.List;
@@ -132,6 +133,12 @@ public void getInstanceConfig() {
     assertThat(client.getInstanceConfig(CONFIG_ID).getId().getName()).isEqualTo(CONFIG_NAME);
   }
 
+  @Test
+  public void dropInstanceConfig() {
+    client.deleteInstanceConfig(CONFIG_ID);
+    verify(rpc).deleteInstanceConfig(CONFIG_NAME);
+  }
+
   @Test
   public void listInstanceConfigs() {
     String nextToken = "token";

samples/snippets/pom.xml

@@ -44,7 +44,20 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-spanner</artifactId>
+      <version>6.20.1-SNAPSHOT</version>
     </dependency>
+    <dependency>
+      <groupId>com.google.api.grpc</groupId>
+      <artifactId>proto-google-cloud-spanner-admin-instance-v1</artifactId>
+      <version>6.20.1-SNAPSHOT</version>
+    </dependency>
+    <dependency>
+      <groupId>com.google.api.grpc</groupId>
+      <artifactId>grpc-google-cloud-spanner-admin-instance-v1</artifactId>
+      <version>6.20.1-SNAPSHOT</version>
+    </dependency>
+
+
     <!-- [END spanner_install_with_bom] -->
 
     <dependency>