ext-proc/backend: add unit test for InferencePoolReconciler (#168)

Signed-off-by: Madhav Jivrajani <madhav.jiv@gmail.com>

pkg/ext-proc/backend/inferencepool_reconciler_test.go

@@ -0,0 +1,85 @@
+package backend
+
+import (
+	"reflect"
+	"testing"
+
+	"inference.networking.x-k8s.io/gateway-api-inference-extension/api/v1alpha1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+var (
+	pool1 = &v1alpha1.InferencePool{
+		Spec: v1alpha1.InferencePoolSpec{
+			Selector: map[v1alpha1.LabelKey]v1alpha1.LabelValue{"app": "vllm"},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:            "test-pool",
+			ResourceVersion: "50",
+		},
+	}
+	// Different name, same RV doesn't really make sense, but helps with testing the
+	// updateStore impl which relies on the equality of RVs alone.
+	modPool1SameRV = &v1alpha1.InferencePool{
+		Spec: v1alpha1.InferencePoolSpec{
+			Selector: map[v1alpha1.LabelKey]v1alpha1.LabelValue{"app": "vllm"},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:            "test-pool-mod",
+			ResourceVersion: "50",
+		},
+	}
+	modPool1DiffRV = &v1alpha1.InferencePool{
+		Spec: v1alpha1.InferencePoolSpec{
+			Selector: map[v1alpha1.LabelKey]v1alpha1.LabelValue{"app": "vllm"},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:            "test-pool-mod",
+			ResourceVersion: "51",
+		},
+	}
+)
+
+func TestUpdateDatastore_InferencePoolReconciler(t *testing.T) {
+	tests := []struct {
+		name         string
+		datastore    *K8sDatastore
+		incomingPool *v1alpha1.InferencePool
+		wantPool     *v1alpha1.InferencePool
+	}{
+		{
+			name:         "InferencePool not set, should set InferencePool",
+			datastore:    &K8sDatastore{},
+			incomingPool: pool1.DeepCopy(),
+			wantPool:     pool1,
+		},
+		{
+			name: "InferencePool set, matching RVs, do nothing",
+			datastore: &K8sDatastore{
+				inferencePool: pool1.DeepCopy(),
+			},
+			incomingPool: modPool1SameRV.DeepCopy(),
+			wantPool:     pool1,
+		},
+		{
+			name: "InferencePool set, differing RVs, re-set InferencePool",
+			datastore: &K8sDatastore{
+				inferencePool: pool1.DeepCopy(),
+			},
+			incomingPool: modPool1DiffRV.DeepCopy(),
+			wantPool:     modPool1DiffRV,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			inferencePoolReconciler := &InferencePoolReconciler{Datastore: test.datastore}
+			inferencePoolReconciler.updateDatastore(test.incomingPool)
+
+			gotPool := inferencePoolReconciler.Datastore.inferencePool
+			if !reflect.DeepEqual(gotPool, test.wantPool) {
+				t.Errorf("Unexpected InferencePool: want %#v, got: %#v", test.wantPool, gotPool)
+			}
+		})
+	}
+}