ISPN-11819 Prevent wrong server state when running tests with Contain…

…erInfinispanServerDriver

server/testdriver/core/src/main/java/org/infinispan/server/test/core/ContainerInfinispanServerDriver.java

@@ -138,7 +138,7 @@ protected void start(String name, File rootDir, String configurationFile) {
             image
                   .withFileFromPath("target", serverOutputPath.getParent())
                   .withFileFromPath("src", serverOutputPath.getParent().getParent().resolve("src"))
-                  .withFileFromPath("build", serverOutputPath);
+                  .withFileFromPath("build", validateServerOutput(serverOutputPath));
             prebuiltImage = false;
             log.infof("Using local image from server built at '%s'", serverOutputPath);
          }
@@ -215,6 +215,32 @@ protected void start(String name, File rootDir, String configurationFile) {
       }
    }
 
+   /*
+    * Once you built the server, you can try to start it and it will create files under the data directory.
+    * Later, you decided to run some tests and it will take ages to find out that the tests are broken because there
+    * are files under the data directory.
+    */
+   private Path validateServerOutput(Path serverOutputPath) {
+      File serverFolder = new File(serverOutputPath.toFile(), "server");
+      if (serverFolder.exists()) {
+         File dataFoler = new File(serverFolder, "data");
+         if (dataFoler.exists()) {
+            File[] files = dataFoler.listFiles();
+            if (files.length > 0) {
+               throw new IllegalStateException("The data directory must be empty.");
+            }
+         }
+         File logFolder = new File(serverFolder, "log");
+         if (logFolder.exists()) {
+            File[] files = dataFoler.listFiles();
+            if (files.length > 0) {
+               throw new IllegalStateException("Clean the log directory.");
+            }
+         }
+      }
+      return serverOutputPath;
+   }
+
    private GenericContainer createContainer(int i) {
 
       if (this.volumes[i] == null) {