feat: funciones impuras migration_create, migration_up, migration_down, migration_status

Fase 2 del issue 0015. MigrationCreate (crea archivo .sql template con version auto-calculada), MigrationUp (aplica migraciones pendientes en transacciones individuales), MigrationDown (revierte ultimas N via down_sql de _migrations), MigrationGetStatus (cruza disco con BD, detecta orphaned). Tests de integracion: ciclo completo create->up->status->down->status. 26 tests, todos pasan. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-04-13 02:01:40 +02:00
parent ca15655268
commit 9b0e1f836d
13 changed files with 1166 additions and 0 deletions
@@ -0,0 +1,115 @@
+package infra
+
+import (
+	"testing"
+)
+
+func TestMigrationDown(t *testing.T) {
+	t.Run("revertir ultima migracion elimina registro y ejecuta down_sql", func(t *testing.T) {
+		db := openTestDB(t)
+		dir := t.TempDir()
+
+		writeMigrationFile(t, dir, "001_create_users.sql",
+			"-- +up\nCREATE TABLE users (id TEXT PRIMARY KEY);\n-- +down\nDROP TABLE IF EXISTS users;\n")
+		writeMigrationFile(t, dir, "002_create_roles.sql",
+			"-- +up\nCREATE TABLE roles (id TEXT PRIMARY KEY);\n-- +down\nDROP TABLE IF EXISTS roles;\n")
+
+		if _, err := MigrationUp(db, dir); err != nil {
+			t.Fatalf("up failed: %v", err)
+		}
+
+		reverted, err := MigrationDown(db, 1)
+		if err != nil {
+			t.Fatalf("down failed: %v", err)
+		}
+		if len(reverted) != 1 {
+			t.Errorf("expected 1 reverted, got %d", len(reverted))
+		}
+		if reverted[0].Version != 2 {
+			t.Errorf("expected version 2 reverted, got %d", reverted[0].Version)
+		}
+
+		// roles table should be gone
+		if err := db.QueryRow("SELECT COUNT(*) FROM roles").Err(); err == nil {
+			t.Error("roles table should not exist after down")
+		}
+
+		// users table should still exist
+		var count int
+		if err := db.QueryRow("SELECT COUNT(*) FROM users").Scan(&count); err != nil {
+			t.Errorf("users table should still exist: %v", err)
+		}
+	})
+
+	t.Run("revertir n migraciones revierte en orden descendente", func(t *testing.T) {
+		db := openTestDB(t)
+		dir := t.TempDir()
+
+		writeMigrationFile(t, dir, "001_create_users.sql",
+			"-- +up\nCREATE TABLE users (id TEXT PRIMARY KEY);\n-- +down\nDROP TABLE IF EXISTS users;\n")
+		writeMigrationFile(t, dir, "002_create_roles.sql",
+			"-- +up\nCREATE TABLE roles (id TEXT PRIMARY KEY);\n-- +down\nDROP TABLE IF EXISTS roles;\n")
+		writeMigrationFile(t, dir, "003_create_logs.sql",
+			"-- +up\nCREATE TABLE logs (id INTEGER PRIMARY KEY);\n-- +down\nDROP TABLE IF EXISTS logs;\n")
+
+		if _, err := MigrationUp(db, dir); err != nil {
+			t.Fatalf("up failed: %v", err)
+		}
+
+		reverted, err := MigrationDown(db, 2)
+		if err != nil {
+			t.Fatalf("down 2 failed: %v", err)
+		}
+		if len(reverted) != 2 {
+			t.Errorf("expected 2 reverted, got %d", len(reverted))
+		}
+		// Should be reverted in descending order: 3, 2
+		if reverted[0].Version != 3 || reverted[1].Version != 2 {
+			t.Errorf("reverted order wrong: got %d, %d", reverted[0].Version, reverted[1].Version)
+		}
+
+		// users table should still exist (migration 1 not reverted)
+		var count int
+		if err := db.QueryRow("SELECT COUNT(*) FROM users").Scan(&count); err != nil {
+			t.Errorf("users table should still exist: %v", err)
+		}
+	})
+
+	t.Run("n cero no revierte nada", func(t *testing.T) {
+		db := openTestDB(t)
+		dir := t.TempDir()
+
+		writeMigrationFile(t, dir, "001_create_users.sql",
+			"-- +up\nCREATE TABLE users (id TEXT PRIMARY KEY);\n-- +down\nDROP TABLE IF EXISTS users;\n")
+
+		if _, err := MigrationUp(db, dir); err != nil {
+			t.Fatalf("up failed: %v", err)
+		}
+
+		reverted, err := MigrationDown(db, 0)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if len(reverted) != 0 {
+			t.Errorf("expected 0 reverted for n=0, got %d", len(reverted))
+		}
+	})
+
+	t.Run("base de datos sin migraciones retorna slice vacio", func(t *testing.T) {
+		db := openTestDB(t)
+		dir := t.TempDir()
+
+		// Apply to create _migrations table
+		if _, err := MigrationUp(db, dir); err != nil {
+			t.Fatalf("up failed: %v", err)
+		}
+
+		reverted, err := MigrationDown(db, 5)
+		if err != nil {
+			t.Fatalf("unexpected error: %v", err)
+		}
+		if len(reverted) != 0 {
+			t.Errorf("expected 0 reverted from empty DB, got %d", len(reverted))
+		}
+	})
+}