rename all remaining packages to internal/ (#12418)

This is to ensure that there are no projects
that try to import `minio/minio/pkg` into
their own repo. Any such common packages should
go to `https://github.com/minio/pkg`

internal/sync/errgroup/errgroup_test.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2015-2021 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package errgroup
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+)
+
+func TestGroupWithNErrs(t *testing.T) {
+	err1 := fmt.Errorf("errgroup_test: 1")
+	err2 := fmt.Errorf("errgroup_test: 2")
+
+	cases := []struct {
+		errs []error
+	}{
+		{errs: []error{nil}},
+		{errs: []error{err1}},
+		{errs: []error{err1, nil}},
+		{errs: []error{err1, nil, err2}},
+	}
+
+	for j, tc := range cases {
+		t.Run(fmt.Sprintf("Test%d", j+1), func(t *testing.T) {
+			g := WithNErrs(len(tc.errs))
+			for i, err := range tc.errs {
+				err := err
+				g.Go(func() error { return err }, i)
+			}
+
+			gotErrs := g.Wait()
+			if !reflect.DeepEqual(gotErrs, tc.errs) {
+				t.Errorf("Expected %#v, got %#v", tc.errs, gotErrs)
+			}
+		})
+	}
+}