Add tests for alter column type

tests/go.mod

@@ -9,10 +9,10 @@ require (
 	github.com/lib/pq v1.10.7
 	golang.org/x/crypto v0.0.0-20221005025214-4161e89ecf1b // indirect
 	gorm.io/driver/mysql v1.4.0
-	gorm.io/driver/postgres v1.4.1
+	gorm.io/driver/postgres v1.4.3
 	gorm.io/driver/sqlite v1.4.1
 	gorm.io/driver/sqlserver v1.4.0
-	gorm.io/gorm v1.23.10
+	gorm.io/gorm v1.24.0
 )
 
 replace gorm.io/gorm => ../

tests/migrate_test.go

@@ -400,7 +400,7 @@ func TestMigrateColumns(t *testing.T) {
 					t.Fatalf("column code unique should be correct, name: %v, column: %#v", columnType.Name(), columnType)
 				}
 				if v, ok := columnType.DefaultValue(); !sqlserver && (!ok || v != "hello") {
-					t.Fatalf("column code default value should be correct, name: %v, column: %#v", columnType.Name(), columnType)
+					t.Fatalf("column code default value should be correct, name: %v, column: %#v, default value: %v", columnType.Name(), columnType, v)
 				}
 				if v, ok := columnType.Comment(); !sqlite && !sqlserver && (!ok || v != "my code2") {
 					t.Fatalf("column code comment should be correct, name: %v, column: %#v", columnType.Name(), columnType)

tests/postgres_test.go

@@ -8,6 +8,7 @@ import (
 	"github.com/lib/pq"
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
+	. "gorm.io/gorm/utils/tests"
 )
 
 func TestPostgresReturningIDWhichHasStringType(t *testing.T) {
@@ -199,3 +200,18 @@ func TestPostgresOnConstraint(t *testing.T) {
 		t.Errorf("expected 1 thing got more")
 	}
 }
+
+type CompanyNew struct {
+	ID   int
+	Name int
+}
+
+func TestAlterColumnDataType(t *testing.T) {
+	DB.AutoMigrate(Company{})
+
+	if err := DB.Table("companies").Migrator().AlterColumn(CompanyNew{}, "name"); err != nil {
+		t.Fatalf("failed to alter column from string to int, got error %v", err)
+	}
+
+	DB.AutoMigrate(Company{})
+}