add a empty class for test prep

Author: JoeWang1127

java-sdk-logging/java-sdk-logging-bom/pom.xml

@@ -12,6 +12,7 @@
   <packaging>pom</packaging>
 
   <artifactId>java-sdk-logging-bom</artifactId>
+  <version>0.1.0-SNAPSHOT</version>
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

java-showcase/gapic-showcase/pom.xml

@@ -291,6 +291,11 @@
           <version>${slf4j1-logback.version}</version>
           <scope>test</scope>
         </dependency>
+        <dependency>
+          <groupId>com.google.api</groupId>
+          <artifactId>logback-extension</artifactId>
+          <version>0.1.0-SNAPSHOT</version>
+        </dependency>
       </dependencies>
       <build>
         <plugins>

java-showcase/gapic-showcase/src/test/java/com/google/showcase/v1beta1/it/logging/TestMdcAppender.java

@@ -0,0 +1,15 @@
+package com.google.showcase.v1beta1.it.logging;
+
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.UnsynchronizedAppenderBase;
+import com.google.api.logging.SDKLoggingMdcJsonProvider;
+
+public class TestMdcAppender extends UnsynchronizedAppenderBase<ILoggingEvent> {
+
+  private final SDKLoggingMdcJsonProvider provider = new SDKLoggingMdcJsonProvider();
+
+  @Override
+  protected void append(ILoggingEvent eventObject) {
+
+  }
+}