create tests for self-ref has one migration

schema/relationship_test.go

@@ -93,6 +93,21 @@ func TestBelongsToWithOnlyReferences2(t *testing.T) {
 	})
 }
 
+func TestSelfReferentialBelongsTo(t *testing.T) {
+	type User struct {
+		ID        int32 `gorm:"primaryKey"`
+		Name      string
+		CreatorID *int32
+		Creator   *User
+	}
+
+	checkStructRelation(t, &User{}, Relation{
+		Name: "Creator", Type: schema.BelongsTo, Schema: "User", FieldSchema: "User",
+		References: []Reference{{"ID", "User", "CreatorID", "User", "", false}},
+	})
+
+}
+
 func TestSelfReferentialBelongsToOverrideReferences(t *testing.T) {
 	type User struct {
 		ID        int32 `gorm:"primaryKey"`

tests/migrate_test.go

@@ -54,6 +54,27 @@ func TestMigrate(t *testing.T) {
 	}
 }
 
+func TestAutoMigrateSelfReferential(t *testing.T) {
+	type MigratePerson struct {
+		ID        uint
+		Name      string
+		ManagerID *uint
+		Manager   *MigratePerson
+	}
+
+	if err := DB.Debug().Migrator().DropTable(&MigratePerson{}); err != nil {
+		t.Fatalf("Failed to drop table, got error %v", err)
+	}
+
+	if err := DB.AutoMigrate(&MigratePerson{}); err != nil {
+		t.Fatalf("Failed to auto migrate, but got error %v", err)
+	}
+
+	if !DB.Migrator().HasConstraint("migrate_people", "fk_migrate_people_manager") {
+		t.Fatalf("Failed to find has one constraint between people and managers")
+	}
+}
+
 func TestSmartMigrateColumn(t *testing.T) {
 	fullSupported := map[string]bool{"mysql": true, "postgres": true}[DB.Dialector.Name()]