Initial commit: Go 1.23 release state

src/errors/join_test.go

@@ -0,0 +1,72 @@
+// Copyright 2022 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package errors_test
+
+import (
+	"errors"
+	"reflect"
+	"testing"
+)
+
+func TestJoinReturnsNil(t *testing.T) {
+	if err := errors.Join(); err != nil {
+		t.Errorf("errors.Join() = %v, want nil", err)
+	}
+	if err := errors.Join(nil); err != nil {
+		t.Errorf("errors.Join(nil) = %v, want nil", err)
+	}
+	if err := errors.Join(nil, nil); err != nil {
+		t.Errorf("errors.Join(nil, nil) = %v, want nil", err)
+	}
+}
+
+func TestJoin(t *testing.T) {
+	err1 := errors.New("err1")
+	err2 := errors.New("err2")
+	for _, test := range []struct {
+		errs []error
+		want []error
+	}{{
+		errs: []error{err1},
+		want: []error{err1},
+	}, {
+		errs: []error{err1, err2},
+		want: []error{err1, err2},
+	}, {
+		errs: []error{err1, nil, err2},
+		want: []error{err1, err2},
+	}} {
+		got := errors.Join(test.errs...).(interface{ Unwrap() []error }).Unwrap()
+		if !reflect.DeepEqual(got, test.want) {
+			t.Errorf("Join(%v) = %v; want %v", test.errs, got, test.want)
+		}
+		if len(got) != cap(got) {
+			t.Errorf("Join(%v) returns errors with len=%v, cap=%v; want len==cap", test.errs, len(got), cap(got))
+		}
+	}
+}
+
+func TestJoinErrorMethod(t *testing.T) {
+	err1 := errors.New("err1")
+	err2 := errors.New("err2")
+	for _, test := range []struct {
+		errs []error
+		want string
+	}{{
+		errs: []error{err1},
+		want: "err1",
+	}, {
+		errs: []error{err1, err2},
+		want: "err1\nerr2",
+	}, {
+		errs: []error{err1, nil, err2},
+		want: "err1\nerr2",
+	}} {
+		got := errors.Join(test.errs...).Error()
+		if got != test.want {
+			t.Errorf("Join(%v).Error() = %q; want %q", test.errs, got, test.want)
+		}
+	}
+}