disable parallel execution

Author: sakthivelmanii

google-cloud-spanner/pom.xml

@@ -65,7 +65,7 @@
                 <spanner.gce.config.project_id>${spanner.gce.config.project_id}</spanner.gce.config.project_id>
                 <spanner.testenv.kms_key.name>${spanner.testenv.kms_key.name}</spanner.testenv.kms_key.name>
               </systemPropertyVariables>
-
+              <parallel>none</parallel>
             </configuration>
           </execution>
           <execution>
@@ -89,6 +89,7 @@
             <spanner.gce.config.project_id>${spanner.gce.config.project_id}</spanner.gce.config.project_id>
             <spanner.testenv.kms_key.name>${spanner.testenv.kms_key.name}</spanner.testenv.kms_key.name>
           </systemPropertyVariables>
+          <parallel>none</parallel>
           <forkedProcessTimeoutInSeconds>3000</forkedProcessTimeoutInSeconds>
         </configuration>
         <executions>
@@ -514,6 +515,7 @@
                   <id>default-test</id>
                   <configuration>
                     <groups>com.google.cloud.spanner.SlowTest</groups>
+                    <parallel>none</parallel>
                   </configuration>
                 </execution>
               </executions>

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

@@ -89,6 +89,14 @@ public Long apply(StructReader input) {
     protected void starting(Description description) {
       System.out.println("Starting test: " + description.getMethodName());
     }
+
+    protected void succeeded(Description description) {
+      System.out.println("Succeeded test: " + description.getMethodName());
+    }
+
+    protected void failed(Throwable e, Description description) {
+      System.out.println("Failed test: " + description.getMethodName());
+    }
   };
 
   @Parameters(name = "fail on invalidated session = {0}")