feat(e2e-tests): model experiment test

tests/integration/godog/features/experiment/model_traffic_split.feature

@@ -0,0 +1,54 @@
+@ExperimentTrafficSplit @Functional @Experiments
+Feature: Experiment traffic splitting
+  In order to perform A/B testing
+  As a model user
+  I need to create an Experiment resource that splits traffic 50/50 between models
+
+  Scenario: Success - Create experiment with 50/50 traffic split between two iris models
+    Given I deploy model spec with timeout "10s":
+    """
+    apiVersion: mlops.seldon.io/v1alpha1
+    kind: Model
+    metadata:
+      name: experiment-1
+    spec:
+      replicas: 1
+      requirements:
+      - sklearn
+      - mlserver
+      storageUri: gs://seldon-models/scv2/samples/mlserver_1.3.5/iris-sklearn
+    """
+    When the model "experiment-1" should eventually become Ready with timeout "20s"
+    Given I deploy model spec with timeout "10s":
+    """
+    apiVersion: mlops.seldon.io/v1alpha1
+    kind: Model
+    metadata:
+      name: experiment-2
+    spec:
+      replicas: 1
+      requirements:
+      - sklearn
+      - mlserver
+      storageUri: gs://seldon-models/scv2/samples/mlserver_1.3.5/iris-sklearn
+    """
+    When the model "experiment-2" should eventually become Ready with timeout "20s"
+    When I deploy experiment spec with timeout "60s":
+    """
+    apiVersion: mlops.seldon.io/v1alpha1
+    kind: Experiment
+    metadata:
+      name: experiment-50-50
+    spec:
+      default: experiment-1
+      candidates:
+      - name: experiment-1
+        weight: 50
+      - name: experiment-2
+        weight: 50
+    """
+    Then the experiment should eventually become Ready with timeout "60s"
+    When I send "20" HTTP inference requests to the experiment and expect all models in response, with payoad:
+    """
+    {"inputs": [{"name": "predict", "shape": [1, 4], "datatype": "FP32", "data": [[1, 2, 3, 4]]}]}
+    """

tests/integration/godog/features/experiment/server_setup.feature

@@ -0,0 +1,32 @@
+@ServerSetup
+Feature: Server setup
+  Deploys an mlserver with one replica. We ensure the pods
+  become ready and remove any other server pods for different
+  servers.
+
+  @ServerSetup @ServerSetupMLServer
+  Scenario: Deploy mlserver Server and remove other servers
+    Given I deploy server spec with timeout "10s":
+    """
+    apiVersion: mlops.seldon.io/v1alpha1
+    kind: Server
+    metadata:
+      name: godog-mlserver
+    spec:
+      replicas: 1
+      serverConfig: mlserver
+    """
+    When the server should eventually become Ready with timeout "30s"
+    Then ensure only "1" pod(s) are deployed for server and they are Ready
+
+
+  @ServerSetup @ServerClean
+  Scenario: Remove any other pre-existing servers
+    Given I remove any other server deployments which are not "godog-mlserver,godog-triton"
+
+# TODO decide if we want to keep this, if we keep testers will need to ensure they don't run this tag when running all
+#  all features in this directory, as tests will fail when server is deleted. We can not delete and it's up to the
+#  feature dir server setup to ensure ONLY the required servers exist, like above.
+#  @ServerTeardown
+#  Scenario: Delete mlserver Server
+#    Given I delete server "godog-mlserver" with timeout "10s"

tests/integration/godog/go.mod

@@ -9,6 +9,8 @@ require (
 	github.com/sirupsen/logrus v1.9.3
 	github.com/spf13/pflag v1.0.7
 	google.golang.org/grpc v1.73.0
+	google.golang.org/protobuf v1.36.6
+	k8s.io/api v0.34.3
 	k8s.io/apiextensions-apiserver v0.34.3
 	k8s.io/apimachinery v0.34.3
 	k8s.io/client-go v0.34.3
@@ -68,11 +70,9 @@ require (
 	golang.org/x/time v0.12.0 // indirect
 	gomodules.xyz/jsonpatch/v2 v2.5.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250603155806-513f23925822 // indirect
-	google.golang.org/protobuf v1.36.6 // indirect
 	gopkg.in/evanphx/json-patch.v4 v4.12.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
-	k8s.io/api v0.34.3 // indirect
 	k8s.io/klog/v2 v2.130.1 // indirect
 	k8s.io/kube-openapi v0.0.0-20250710124328-f3f2b991d03b // indirect
 	k8s.io/utils v0.0.0-20250604170112-4c0f3b243397 // indirect

tests/integration/godog/k8sclient/client.go

@@ -129,6 +129,15 @@ func (k8s *K8sClient) DeleteScenarioResources(ctx context.Context, labels client
 		return fmt.Errorf("failed to delete Pipelines: %w", err)
 	}
 
+	if err := k8s.KubeClient.DeleteAllOf(
+		ctx,
+		&mlopsv1alpha1.Experiment{},
+		client.InNamespace(k8s.namespace),
+		labels,
+	); err != nil {
+		return fmt.Errorf("failed to delete Experiments: %w", err)
+	}
+
 	ctx, cancel := context.WithTimeout(ctx, 1*time.Minute)
 	defer cancel()
 
@@ -163,7 +172,18 @@ func (k8s *K8sClient) DeleteScenarioResources(ctx context.Context, labels client
 				return fmt.Errorf("failed to list Pipelines: %w", err)
 			}
 
-			if len(modelList.Items) == 0 && len(pipelineList.Items) == 0 {
+			// Check Experiments
+			var experimentList mlopsv1alpha1.ExperimentList
+			if err := k8s.KubeClient.List(
+				ctx,
+				&experimentList,
+				client.InNamespace(k8s.namespace),
+				labels,
+			); err != nil {
+				return fmt.Errorf("failed to list Experiments: %w", err)
+			}
+
+			if len(modelList.Items) == 0 && len(pipelineList.Items) == 0 && len(experimentList.Items) == 0 {
 				return nil
 			}
 		}

tests/integration/godog/k8sclient/watcher_store.go

@@ -27,6 +27,7 @@ import (
 type WatcherStorage interface {
 	WaitForObjectCondition(ctx context.Context, obj runtime.Object, cond ConditionFunc) error
 	WaitForModelCondition(ctx context.Context, modelName string, cond ConditionFunc) error
+	WaitForExperimentCondition(ctx context.Context, experimentName string, cond ConditionFunc) error
 	WaitForPipelineCondition(ctx context.Context, modelName string, cond ConditionFunc) error
 	Clear()
 	Start()
@@ -36,18 +37,20 @@ type WatcherStorage interface {
 type objectKind string
 
 const (
-	model    objectKind = "Model"
-	pipeline objectKind = "Pipeline"
+	model      objectKind = "Model"
+	pipeline   objectKind = "Pipeline"
+	experiment objectKind = "Experiment"
 )
 
 type WatcherStore struct {
-	namespace       string
-	label           string
-	mlopsClient     v1alpha1.MlopsV1alpha1Interface
-	modelWatcher    watch.Interface
-	pipelineWatcher watch.Interface
-	logger          log.FieldLogger
-	scheme          *runtime.Scheme
+	namespace         string
+	label             string
+	mlopsClient       v1alpha1.MlopsV1alpha1Interface
+	modelWatcher      watch.Interface
+	pipelineWatcher   watch.Interface
+	experimentWatcher watch.Interface
+	logger            log.FieldLogger
+	scheme            *runtime.Scheme
 
 	mu      sync.RWMutex
 	store   map[string]runtime.Object // key: "namespace/name"
@@ -80,21 +83,27 @@ func NewWatcherStore(namespace string, label string, mlopsClient v1alpha1.MlopsV
 		return nil, fmt.Errorf("failed to create pipeline watcher: %w", err)
 	}
 
+	experimentWatcher, err := mlopsClient.Experiments(namespace).Watch(context.Background(), v1.ListOptions{LabelSelector: DefaultCRDTestSuiteLabel})
+	if err != nil {
+		return nil, fmt.Errorf("failed to create experiment watcher: %w", err)
+	}
+
 	// Base scheme + register your CRDs
 	s := runtime.NewScheme()
 	_ = scheme.AddToScheme(s)      // core k8s types (optional but fine)
 	_ = mlopsscheme.AddToScheme(s) // <-- this is the key line for your CRDs
 
 	return &WatcherStore{
-		namespace:       namespace,
-		label:           label,
-		mlopsClient:     mlopsClient,
-		modelWatcher:    modelWatcher,
-		pipelineWatcher: pipelineWatcher,
-		logger:          logger.WithField("client", "watcher_store"),
-		store:           make(map[string]runtime.Object),
-		doneChan:        make(chan struct{}),
-		scheme:          s,
+		namespace:         namespace,
+		label:             label,
+		mlopsClient:       mlopsClient,
+		modelWatcher:      modelWatcher,
+		experimentWatcher: experimentWatcher,
+		pipelineWatcher:   pipelineWatcher,
+		logger:            logger.WithField("client", "watcher_store"),
+		store:             make(map[string]runtime.Object),
+		doneChan:          make(chan struct{}),
+		scheme:            s,
 	}, nil
 }
 
@@ -172,6 +181,42 @@ func (s *WatcherStore) Start() {
 			}
 		}
 	}()
+	go func() {
+		for {
+			select {
+			case event, ok := <-s.experimentWatcher.ResultChan():
+				if !ok {
+					// channel closed: watcher terminated
+					return
+				}
+
+				accessor, err := meta.Accessor(event.Object)
+				if err != nil {
+					s.logger.WithError(err).Error("failed to access experiment watcher")
+				} else {
+					s.logger.WithField("event", event).Tracef("new experiment watch event with name: %s on namespace: %s", accessor.GetName(), accessor.GetNamespace())
+				}
+
+				if event.Object == nil {
+					continue
+				}
+
+				switch event.Type {
+				case watch.Added, watch.Modified:
+					s.put(event.Object)
+				case watch.Deleted:
+					s.delete(event.Object)
+				case watch.Error:
+					fmt.Printf("experiment watch error: %v\n", event.Object)
+				}
+
+			case <-s.doneChan:
+				// Stop underlying watcher and exit
+				s.experimentWatcher.Stop()
+				return
+			}
+		}
+	}()
 }
 
 // Stop terminates the watcher loop.
@@ -308,6 +353,12 @@ func (s *WatcherStore) WaitForObjectCondition(ctx context.Context, obj runtime.O
 		return err
 	}
 }
+
+func (s *WatcherStore) WaitForExperimentCondition(ctx context.Context, experimentName string, cond ConditionFunc) error {
+	key := fmt.Sprintf("%s/%s/%s", s.namespace, experiment, experimentName)
+	return s.waitForKey(ctx, key, cond)
+}
+
 func (s *WatcherStore) WaitForModelCondition(ctx context.Context, modelName string, cond ConditionFunc) error {
 	key := fmt.Sprintf("%s/%s/%s", s.namespace, model, modelName)
 	return s.waitForKey(ctx, key, cond)

tests/integration/godog/steps/assertions/model.go

@@ -26,11 +26,20 @@ func ModelReady(obj runtime.Object) (bool, error) {
 		return false, fmt.Errorf("unexpected type %T, expected *v1alpha1.Model", obj)
 	}
 
-	if model.Status.IsReady() {
-		return true, nil
+	return model.Status.IsReady(), nil
+}
+
+func ExperimentReady(obj runtime.Object) (bool, error) {
+	if obj == nil {
+		return false, nil
+	}
+
+	experiment, ok := obj.(*v1alpha1.Experiment)
+	if !ok {
+		return false, fmt.Errorf("unexpected type %T, expected *v1alpha1.Experiment", obj)
 	}
 
-	return false, nil
+	return experiment.Status.IsReady(), nil
 }
 
 //func ModelReadyMessageCondition(expectedMessage string) k8sclient.ConditionFunc {

tests/integration/godog/steps/custom_model_steps.go

@@ -14,12 +14,31 @@ import (
 	"errors"
 	"fmt"
 
+	"github.com/cucumber/godog"
 	"github.com/seldonio/seldon-core/tests/integration/godog/steps/assertions"
 	k8serrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/watch"
 )
 
+func LoadCustomModelSteps(scenario *godog.ScenarioContext, w *World) {
+	scenario.Step(`^I deploy model spec with timeout "([^"]+)":$`, func(timeout string, spec *godog.DocString) error {
+		return withTimeoutCtx(timeout, func(ctx context.Context) error {
+			return w.currentModel.deployModelSpec(ctx, spec)
+		})
+	})
+	scenario.Step(`^the model "([^"]+)" should eventually become Ready with timeout "([^"]+)"$`, func(model, timeout string) error {
+		return withTimeoutCtx(timeout, func(ctx context.Context) error {
+			return w.currentModel.waitForModelNameReady(ctx, model)
+		})
+	})
+	scenario.Step(`^delete the model "([^"]+)" with timeout "([^"]+)"$`, func(model, timeout string) error {
+		return withTimeoutCtx(timeout, func(ctx context.Context) error {
+			return w.currentModel.deleteModel(ctx, model)
+		})
+	})
+}
+
 // deleteModel we have to wait for model to be deleted, as there is a finalizer attached so the scheduler can confirm
 // when model has been unloaded from inference pod, model-gw, dataflow-engine, pipeline-gw and controller will remove
 // finalizer so deletion can complete.