Expose getProjectId in DatastoreEmulatorContainer (#7328)

Author: eddumelendez

modules/gcloud/src/main/java/org/testcontainers/containers/DatastoreEmulatorContainer.java

@@ -18,8 +18,12 @@ public class DatastoreEmulatorContainer extends GenericContainer<DatastoreEmulat
         "gcr.io/google.com/cloudsdktool/cloud-sdk"
     );
 
-    private static final String CMD =
-        "gcloud beta emulators datastore start --project test-project --host-port 0.0.0.0:8081";
+    private static final String PROJECT_ID = "test-project";
+
+    private static final String CMD = String.format(
+        "gcloud beta emulators datastore start --project %s --host-port 0.0.0.0:8081",
+        PROJECT_ID
+    );
 
     private static final int HTTP_PORT = 8081;
 
@@ -59,4 +63,8 @@ public DatastoreEmulatorContainer withFlags(String flags) {
     public String getEmulatorEndpoint() {
         return getHost() + ":" + getMappedPort(HTTP_PORT);
     }
+
+    public String getProjectId() {
+        return PROJECT_ID;
+    }
 }

modules/gcloud/src/test/java/org/testcontainers/containers/DatastoreEmulatorContainerTest.java

@@ -32,7 +32,7 @@ public void testSimple() {
             .setHost(emulator.getEmulatorEndpoint())
             .setCredentials(NoCredentials.getInstance())
             .setRetrySettings(ServiceOptions.getNoRetrySettings())
-            .setProjectId("test-project")
+            .setProjectId(emulator.getProjectId())
             .build();
         Datastore datastore = options.getService();