feat: 接入 Instance 扩展能力观测

internal/database/domain/instance/instance_extensions_test.go

@@ -0,0 +1,105 @@
+/*
+Copyright 2026.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package instance_test
+
+import (
+	"testing"
+
+	"git.ddupan.top/panxiao81/ayatori/internal/database/domain/instance"
+)
+
+// Acceptance: docs/database/domain-instance.md §2/§3, extension observations are
+// bound to the current registration and definition and never authorize provisioning.
+func TestInstanceAcceptsExtensionObservationForCurrentTarget(t *testing.T) {
+	value := lifecycleInstance(t, instance.Snapshot{Phase: instance.PhaseValidating}, false)
+	target := value.Target()
+	snapshot := value.Snapshot()
+
+	if err := value.ObserveExtensions(target, instance.ObserveExtensionSupport([]string{"pg_trgm"})); err != nil {
+		t.Fatal(err)
+	}
+	if got := value.CheckExtensions(instance.NewExtensionSet([]string{"pg_trgm"})); got.Decision != instance.ExtensionsAccepted {
+		t.Fatalf("CheckExtensions() = %v, want accepted", got)
+	}
+	if value.Snapshot() != snapshot {
+		t.Fatal("extension observation changed the persisted lifecycle snapshot")
+	}
+}
+
+func TestInstanceRejectsExtensionObservationForDifferentTarget(t *testing.T) {
+	value := lifecycleInstance(t, instance.Snapshot{Phase: instance.PhaseValidating}, false)
+	identity, _, definition := targetParts(t)
+	revision, err := instance.NewRevision(value.Target().Revision().Value() + 1)
+	if err != nil {
+		t.Fatal(err)
+	}
+	different, err := instance.NewObservationTarget(identity, revision, definition)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if err := value.ObserveExtensions(different, instance.ObserveExtensionSupport([]string{"pg_trgm"})); err == nil {
+		t.Fatal("observation for a different target was accepted")
+	}
+	if got := value.CheckExtensions(instance.NewExtensionSet([]string{"pg_trgm"})); got.Decision != instance.ExtensionSupportUnobserved {
+		t.Fatalf("rejected observation changed support: %v", got)
+	}
+}
+
+func TestInstanceClearsExtensionObservationAcrossLifecycleBoundaries(t *testing.T) {
+	requested := instance.NewExtensionSet([]string{"pg_trgm"})
+
+	t.Run("validation", func(t *testing.T) {
+		value := lifecycleInstance(t, instance.Snapshot{Phase: instance.PhaseReady}, false)
+		if err := value.ObserveExtensions(value.Target(), instance.ObserveExtensionSupport([]string{"pg_trgm"})); err != nil {
+			t.Fatal(err)
+		}
+		if err := value.BeginValidation(); err != nil {
+			t.Fatal(err)
+		}
+		if got := value.CheckExtensions(requested); got.Decision != instance.ExtensionSupportUnobserved {
+			t.Fatalf("validation retained stale support: %v", got)
+		}
+	})
+
+	t.Run("deletion", func(t *testing.T) {
+		value := lifecycleInstance(t, instance.Snapshot{Phase: instance.PhaseReady}, true)
+		if err := value.ObserveExtensions(value.Target(), instance.ObserveExtensionSupport([]string{"pg_trgm"})); err == nil {
+			t.Fatal("deleting instance accepted a new observation")
+		}
+		if err := value.BeginDeletion(); err != nil {
+			t.Fatal(err)
+		}
+		if got := value.CheckExtensions(requested); got.Decision != instance.ExtensionSupportUnobserved {
+			t.Fatalf("deletion retained extension support: %v", got)
+		}
+	})
+}
+
+func TestInstanceCanExplicitlyInvalidateExtensionObservation(t *testing.T) {
+	value := lifecycleInstance(t, instance.Snapshot{Phase: instance.PhaseValidating}, false)
+	requested := instance.NewExtensionSet([]string{"pg_trgm"})
+	if err := value.ObserveExtensions(value.Target(), instance.ObserveExtensionSupport([]string{"pg_trgm"})); err != nil {
+		t.Fatal(err)
+	}
+	if err := value.ObserveExtensions(value.Target(), instance.ExtensionSupport{}); err != nil {
+		t.Fatal(err)
+	}
+	if got := value.CheckExtensions(requested); got.Decision != instance.ExtensionSupportUnobserved {
+		t.Fatalf("explicit invalidation retained stale support: %v", got)
+	}
+}