feat(diff): диф-движок шаблон↔зона с Actionable и ReadOnly для NS/SOA

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/diff/diff_test.go

@@ -0,0 +1,75 @@
+package diff
+
+import (
+	"testing"
+
+	"github.com/vasyakrg/dns-autoresolver/internal/model"
+)
+
+func find(cs Changeset, key string) *RecordDiff {
+	for i := range cs.Diffs {
+		d := cs.Diffs[i]
+		var r *model.Record
+		if d.Desired != nil {
+			r = d.Desired
+		} else {
+			r = d.Actual
+		}
+		if r.Key() == key {
+			return &cs.Diffs[i]
+		}
+	}
+	return nil
+}
+
+func TestDiffAddUpdateDeleteInSync(t *testing.T) {
+	tmpl := []model.Record{
+		{Type: model.A, Name: "a.example.com.", TTL: 300, Values: []string{"1.1.1.1"}}, // in sync
+		{Type: model.A, Name: "b.example.com.", TTL: 300, Values: []string{"2.2.2.2"}}, // update
+		{Type: model.A, Name: "c.example.com.", TTL: 300, Values: []string{"3.3.3.3"}}, // add
+	}
+	actual := []model.Record{
+		{Type: model.A, Name: "a.example.com.", TTL: 300, Values: []string{"1.1.1.1"}},
+		{Type: model.A, Name: "b.example.com.", TTL: 300, Values: []string{"9.9.9.9"}},
+		{Type: model.A, Name: "d.example.com.", TTL: 300, Values: []string{"4.4.4.4"}}, // delete (extra)
+	}
+	cs := Diff(tmpl, actual)
+
+	if d := find(cs, "A a.example.com."); d == nil || d.Kind != InSync {
+		t.Fatalf("a should be InSync, got %+v", d)
+	}
+	if d := find(cs, "A b.example.com."); d == nil || d.Kind != Update {
+		t.Fatalf("b should be Update, got %+v", d)
+	}
+	if d := find(cs, "A c.example.com."); d == nil || d.Kind != Add {
+		t.Fatalf("c should be Add, got %+v", d)
+	}
+	if d := find(cs, "A d.example.com."); d == nil || d.Kind != Delete {
+		t.Fatalf("d should be Delete, got %+v", d)
+	}
+}
+
+func TestDiffMarksReadOnlyForNSSOA(t *testing.T) {
+	tmpl := []model.Record{{Type: model.NS, Name: "example.com.", TTL: 3600, Values: []string{"ns1.example.com."}}}
+	actual := []model.Record{{Type: model.NS, Name: "example.com.", TTL: 3600, Values: []string{"ns9.other.com."}}}
+	cs := Diff(tmpl, actual)
+	d := find(cs, "NS example.com.")
+	if d == nil || d.Kind != Update || !d.ReadOnly {
+		t.Fatalf("NS diff must be Update and ReadOnly, got %+v", d)
+	}
+}
+
+func TestActionableExcludesInSyncAndReadOnly(t *testing.T) {
+	tmpl := []model.Record{
+		{Type: model.A, Name: "a.example.com.", TTL: 300, Values: []string{"1.1.1.1"}},          // in sync
+		{Type: model.A, Name: "b.example.com.", TTL: 300, Values: []string{"2.2.2.2"}},          // add
+		{Type: model.NS, Name: "example.com.", TTL: 3600, Values: []string{"ns1.example.com."}}, // read-only add
+	}
+	actual := []model.Record{
+		{Type: model.A, Name: "a.example.com.", TTL: 300, Values: []string{"1.1.1.1"}},
+	}
+	act := Diff(tmpl, actual).Actionable()
+	if len(act) != 1 || act[0].Name != "b.example.com." {
+		t.Fatalf("only b.example.com. is actionable, got %+v", act)
+	}
+}