first commit of restructured project

trahn-trade-backend/internal/testutil/db.go

@@ -0,0 +1,42 @@
+package testutil
+
+import (
+	"context"
+	"os"
+	"testing"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/joho/godotenv"
+)
+
+// SetupPool creates a pgxpool.Pool for integration tests.
+// Connection details come from env vars or sensible defaults.
+func SetupPool(t *testing.T) *pgxpool.Pool {
+	t.Helper()
+
+	_ = godotenv.Load("../../.env")
+
+	dsn := os.Getenv("TEST_DATABASE_URL")
+	if dsn == "" {
+		host := EnvOr("DB_HOST", "localhost")
+		port := EnvOr("DB_PORT", "5432")
+		name := EnvOr("DB_NAME", "trahn_grid_trader")
+		user := EnvOr("DB_USER", "postgres")
+		pass := EnvOr("DB_PASSWORD", "")
+		dsn = "postgres://" + user + ":" + pass + "@" + host + ":" + port + "/" + name + "?sslmode=disable"
+	}
+
+	pool, err := pgxpool.New(context.Background(), dsn)
+	if err != nil {
+		t.Fatalf("connect: %v", err)
+	}
+	t.Cleanup(func() { pool.Close() })
+	return pool
+}
+
+func EnvOr(key, fallback string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return fallback
+}