chore: run it tests serially (#1458)

* chore: fix failsafe plugin hanging

* chore: try running all tests serially

Author: thiagotnunes

.kokoro/build.sh

@@ -47,7 +47,10 @@ set +e
 
 case ${JOB_TYPE} in
 test)
-    mvn test -B -Dclirr.skip=true -Denforcer.skip=true
+    mvn test -B \
+      -Dclirr.skip=true \
+      -Denforcer.skip=true \
+      -Djava.net.preferIPv4Stack=true
     RETURN_CODE=$?
     ;;
 lint)
@@ -62,6 +65,7 @@ integration)
     mvn -B ${INTEGRATION_TEST_ARGS} \
       -ntp \
       -Penable-integration-tests \
+      -Djava.net.preferIPv4Stack=true \
       -DtrimStackTrace=false \
       -Dclirr.skip=true \
       -Denforcer.skip=true \
@@ -73,6 +77,7 @@ slowtests)
   mvn -B ${INTEGRATION_TEST_ARGS} \
     -ntp \
     -Pslow-tests \
+    -Djava.net.preferIPv4Stack=true \
     -DskipITs=false \
     -DtrimStackTrace=false \
     -Dclirr.skip=true \

google-cloud-spanner/pom.xml

@@ -81,19 +81,7 @@
           <execution>
             <id>default</id>
             <configuration>
-              <groups>com.google.cloud.spanner.SerialIntegrationTest</groups>
-            </configuration>
-          </execution>
-          <!-- Executes parallel integration tests -->
-          <execution>
-            <id>parallel-integration-test</id>
-            <goals>
-              <goal>integration-test</goal>
-            </goals>
-            <configuration>
-              <groups>com.google.cloud.spanner.ParallelIntegrationTest</groups>
-              <forkCount>8</forkCount>
-              <reuseForks>true</reuseForks>
+              <groups>com.google.cloud.spanner.SerialIntegrationTest, com.google.cloud.spanner.ParallelIntegrationTest</groups>
             </configuration>
           </execution>
         </executions>