Add first Session unit test

Author: otoolep

sqlite3_session_test.go

@@ -0,0 +1,69 @@
+package sqlite3
+
+import (
+	"context"
+	"database/sql"
+	"testing"
+)
+
+func Test_EmptyChangeset(t *testing.T) {
+	// Open a new in-memory SQLite database
+	db, err := sql.Open("sqlite3", ":memory:")
+	if err != nil {
+		t.Fatal("Failed to open", err)
+	}
+	err = db.Ping()
+	if err != nil {
+		t.Fatal("Failed to ping", err)
+	}
+	defer db.Close()
+
+	_, err = db.Exec(`CREATE TABLE test_table (id INTEGER PRIMARY KEY, value TEXT);`)
+	if err != nil {
+		t.Fatalf("Failed to create table: %v", err)
+	}
+
+	conn, err := db.Conn(context.Background())
+	if err != nil {
+		t.Fatal("Failed to get connection to source database:", err)
+	}
+	defer conn.Close()
+
+	var session *Session
+	if err := conn.Raw(func(raw any) error {
+		var err error
+		session, err = raw.(*SQLiteConn).CreateSession("main")
+		return err
+	}); err != nil {
+		t.Fatal("Failed to serialize source database:", err)
+	}
+	defer func() {
+		if err := session.DeleteSession(); err != nil {
+			t.Errorf("Failed to delete session: %v", err)
+		}
+	}()
+
+	err = session.AttachSession("test_table")
+	if err != nil {
+		t.Fatalf("Failed to attach session to table: %v", err)
+	}
+
+	changeset, err := session.Changeset()
+	if err != nil {
+		t.Fatalf("Failed to generate changeset: %v", err)
+	}
+
+	iter, err := NewChangesetIterator(changeset)
+	if err != nil {
+		t.Fatalf("Failed to create changeset iterator: %v", err)
+	}
+	if b, err := iter.Next(); err != nil {
+		t.Fatalf("Failed to get next changeset: %v", err)
+	} else if b {
+		t.Fatalf("changeset contains changes: %v", b)
+	}
+
+	if err := iter.Finalize(); err != nil {
+		t.Fatalf("Failed to finalize changeset iterator: %v", err)
+	}
+}