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

swarm/shed/field_string_test.go

@@ -0,0 +1,110 @@
+// 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"
+)
+
+// TestStringField validates put and get operations
+// of the StringField.
+func TestStringField(t *testing.T) {
+	db, cleanupFunc := newTestDB(t)
+	defer cleanupFunc()
+
+	simpleString, err := db.NewStringField("simple-string")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Run("get empty", func(t *testing.T) {
+		got, err := simpleString.Get()
+		if err != nil {
+			t.Fatal(err)
+		}
+		want := ""
+		if got != want {
+			t.Errorf("got string %q, want %q", got, want)
+		}
+	})
+
+	t.Run("put", func(t *testing.T) {
+		want := "simple string value"
+		err = simpleString.Put(want)
+		if err != nil {
+			t.Fatal(err)
+		}
+		got, err := simpleString.Get()
+		if err != nil {
+			t.Fatal(err)
+		}
+		if got != want {
+			t.Errorf("got string %q, want %q", got, want)
+		}
+
+		t.Run("overwrite", func(t *testing.T) {
+			want := "overwritten string value"
+			err = simpleString.Put(want)
+			if err != nil {
+				t.Fatal(err)
+			}
+			got, err := simpleString.Get()
+			if err != nil {
+				t.Fatal(err)
+			}
+			if got != want {
+				t.Errorf("got string %q, want %q", got, want)
+			}
+		})
+	})
+
+	t.Run("put in batch", func(t *testing.T) {
+		batch := new(leveldb.Batch)
+		want := "simple string batch value"
+		simpleString.PutInBatch(batch, want)
+		err = db.WriteBatch(batch)
+		if err != nil {
+			t.Fatal(err)
+		}
+		got, err := simpleString.Get()
+		if err != nil {
+			t.Fatal(err)
+		}
+		if got != want {
+			t.Errorf("got string %q, want %q", got, want)
+		}
+
+		t.Run("overwrite", func(t *testing.T) {
+			batch := new(leveldb.Batch)
+			want := "overwritten string batch value"
+			simpleString.PutInBatch(batch, want)
+			err = db.WriteBatch(batch)
+			if err != nil {
+				t.Fatal(err)
+			}
+			got, err := simpleString.Get()
+			if err != nil {
+				t.Fatal(err)
+			}
+			if got != want {
+				t.Errorf("got string %q, want %q", got, want)
+			}
+		})
+	})
+}