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5f96b84a18
Add an IsInterfaceNil checker that ensures both a variable's type and value are nil. This is useful to prevent returned errors with non-nil types from being compared to a nil value with a nil type (since the compiler can't tell that the other variable is not nil typed), resulting in the check failing. Signed-off-by: Miguel Pires <miguel.pires@canonical.com>
73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2022 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package testutil_test
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import (
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"errors"
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. "github.com/snapcore/snapd/testutil"
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. "gopkg.in/check.v1"
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)
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type errorIsCheckerSuite struct{}
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var _ = Suite(&errorIsCheckerSuite{})
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type baseError struct{}
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func (baseError) Error() string { return "" }
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func (baseError) Is(err error) bool {
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_, ok := err.(baseError)
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return ok
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}
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type wrapperError struct {
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err error
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}
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func (*wrapperError) Error() string { return "" }
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func (e *wrapperError) Unwrap() error { return e.err }
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func (*errorIsCheckerSuite) TestErrorIsCheckSucceeds(c *C) {
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testInfo(c, ErrorIs, "ErrorIs", []string{"error", "target"})
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c.Assert(baseError{}, ErrorIs, baseError{})
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err := &wrapperError{err: baseError{}}
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c.Assert(err, ErrorIs, baseError{})
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}
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func (*errorIsCheckerSuite) TestErrorIsCheckFails(c *C) {
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c.Assert(nil, Not(ErrorIs), baseError{})
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c.Assert(errors.New(""), Not(ErrorIs), baseError{})
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}
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func (*errorIsCheckerSuite) TestErrorIsWithInvalidArguments(c *C) {
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res, errMsg := ErrorIs.Check([]interface{}{"", errors.New("")}, []string{"error", "target"})
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c.Assert(res, Equals, false)
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c.Assert(errMsg, Equals, "first argument must be an error")
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res, errMsg = ErrorIs.Check([]interface{}{errors.New(""), ""}, []string{"error", "target"})
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c.Assert(res, Equals, false)
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c.Assert(errMsg, Equals, "second argument must be an error")
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}
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