Update tests to always run at least one of the variants against genui…

…ne or mock service.

Rename the alternative test to MockS3.. to GenuineS3..
Update readme file accordingly.

README.md

@@ -100,6 +100,9 @@ mvn verify
 
 If any of the required properties are not specified tests will be skipped (uses `org.junit.Assume`).
 
+In case credentials are not provided and running on Linux, tests will be run against mock containerized S3 instance.
+These require a functioning podman or Docker environment.
+
 # Reporting Issues
 
 Project JGroups AWS uses GitHub issues:

src/test/java/org/jgroups/protocols/aws/AbstractS3_PINGDiscoveryTestCase.java

@@ -40,6 +40,10 @@ public abstract class AbstractS3_PINGDiscoveryTestCase {
     // credentials (e.g. running JDK8 and JDK9 on the CI).
     public static final String RANDOM_CLUSTER_NAME = UUID.randomUUID().toString();
 
+    static boolean isGenuineCredentialsAvailable() {
+        return System.getenv("AWS_ACCESS_KEY_ID") != null && System.getenv("AWS_SECRET_ACCESS_KEY") != null && System.getenv("S3_PING_BUCKET_NAME") != null;
+    }
+
     @Test
     public void testDiscovery() throws Exception {
         discover(RANDOM_CLUSTER_NAME, S3_PING.class.getSimpleName());

src/test/java/org/jgroups/protocols/aws/RealS3_PINGDiscoveryTestCase.java → src/test/java/org/jgroups/protocols/aws/GenuineS3_PINGDiscoveryTestCase.java

@@ -20,15 +20,14 @@
 import org.junit.BeforeClass;
 
 /**
- * Tests against real S3 endpoint requiring credentials.
+ * Tests against genuine S3 endpoint requiring credentials.
  *
  * @author Radoslav Husar
  */
-public class RealS3_PINGDiscoveryTestCase extends AbstractS3_PINGDiscoveryTestCase {
+public class GenuineS3_PINGDiscoveryTestCase extends AbstractS3_PINGDiscoveryTestCase {
 
     @BeforeClass
     public static void assumeCredentials() {
-        Assume.assumeTrue("Credentials are not available, test is ignored!", System.getenv("AWS_ACCESS_KEY_ID") != null && System.getenv("AWS_SECRET_ACCESS_KEY") != null && System.getenv("S3_PING_BUCKET_NAME") != null);
+        Assume.assumeTrue("Credentials are not available, test will be ignored!", isGenuineCredentialsAvailable());
     }
-
 }

src/test/java/org/jgroups/protocols/aws/MockS3_PINGDiscoveryTestCase.java

@@ -17,13 +17,16 @@
 package org.jgroups.protocols.aws;
 
 import com.adobe.testing.s3mock.testcontainers.S3MockContainer;
+import org.jgroups.util.Util;
 import org.junit.AfterClass;
 import org.junit.Assume;
 import org.junit.BeforeClass;
 import org.testcontainers.DockerClientFactory;
 
+import static org.junit.Assert.fail;
+
 /**
- * Tests against a mock S3 service.
+ * Tests against a containerized mock S3 service.
  *
  * @author Radoslav Husar
  */
@@ -33,7 +36,12 @@ public class MockS3_PINGDiscoveryTestCase extends AbstractS3_PINGDiscoveryTestCa
 
     @BeforeClass
     public static void setUp() {
-        Assume.assumeTrue("Docker environment is not available - skipping tests against S3 mock service.", isDockerAvailable());
+        // If credentials are available, we can conditionally skip Mock tests
+        if (isGenuineCredentialsAvailable() || (!isDockerAvailable() && !Util.checkForLinux())) {
+            Assume.assumeTrue("Podman/Docker environment is not available - skipping tests against S3 mock service.", isDockerAvailable());
+        } else if (!isDockerAvailable()) {
+            fail("Credentials are not provided, thus Podman/Docker on Linux is required to run tests against a mock service!");
+        }
 
         // TODO Since 3.3.0 the obscure cluster name tests start to fail. Manage the version manually and keep on '3.2.0' for now.
         s3Mock = new S3MockContainer("3.2.0");