swarm: add database abstractions (shed package) (#18183)

swarm/shed/field_struct_test.go

@@ -0,0 +1,127 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package shed
+
+import (
+	"testing"
+
+	"github.com/syndtr/goleveldb/leveldb"
+)
+
+// TestStructField validates put and get operations
+// of the StructField.
+func TestStructField(t *testing.T) {
+	db, cleanupFunc := newTestDB(t)
+	defer cleanupFunc()
+
+	complexField, err := db.NewStructField("complex-field")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	type complexStructure struct {
+		A string
+	}
+
+	t.Run("get empty", func(t *testing.T) {
+		var s complexStructure
+		err := complexField.Get(&s)
+		if err != leveldb.ErrNotFound {
+			t.Fatalf("got error %v, want %v", err, leveldb.ErrNotFound)
+		}
+		want := ""
+		if s.A != want {
+			t.Errorf("got string %q, want %q", s.A, want)
+		}
+	})
+
+	t.Run("put", func(t *testing.T) {
+		want := complexStructure{
+			A: "simple string value",
+		}
+		err = complexField.Put(want)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var got complexStructure
+		err = complexField.Get(&got)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if got.A != want.A {
+			t.Errorf("got string %q, want %q", got.A, want.A)
+		}
+
+		t.Run("overwrite", func(t *testing.T) {
+			want := complexStructure{
+				A: "overwritten string value",
+			}
+			err = complexField.Put(want)
+			if err != nil {
+				t.Fatal(err)
+			}
+			var got complexStructure
+			err = complexField.Get(&got)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if got.A != want.A {
+				t.Errorf("got string %q, want %q", got.A, want.A)
+			}
+		})
+	})
+
+	t.Run("put in batch", func(t *testing.T) {
+		batch := new(leveldb.Batch)
+		want := complexStructure{
+			A: "simple string batch value",
+		}
+		complexField.PutInBatch(batch, want)
+		err = db.WriteBatch(batch)
+		if err != nil {
+			t.Fatal(err)
+		}
+		var got complexStructure
+		err := complexField.Get(&got)
+		if err != nil {
+			t.Fatal(err)
+		}
+		if got.A != want.A {
+			t.Errorf("got string %q, want %q", got, want)
+		}
+
+		t.Run("overwrite", func(t *testing.T) {
+			batch := new(leveldb.Batch)
+			want := complexStructure{
+				A: "overwritten string batch value",
+			}
+			complexField.PutInBatch(batch, want)
+			err = db.WriteBatch(batch)
+			if err != nil {
+				t.Fatal(err)
+			}
+			var got complexStructure
+			err := complexField.Get(&got)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if got.A != want.A {
+				t.Errorf("got string %q, want %q", got, want)
+			}
+		})
+	})
+}