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52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
// Copyright 2011 Aaron Jacobs. All Rights Reserved.
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// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package oglematchers
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// Error returns a matcher that matches non-nil values implementing the
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// built-in error interface for whom the return value of Error() matches the
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// supplied matcher.
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//
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// For example:
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//
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// err := errors.New("taco burrito")
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//
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// Error(Equals("taco burrito")) // matches err
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// Error(HasSubstr("taco")) // matches err
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// Error(HasSubstr("enchilada")) // doesn't match err
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//
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func Error(m Matcher) Matcher {
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return &errorMatcher{m}
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}
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type errorMatcher struct {
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wrappedMatcher Matcher
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}
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func (m *errorMatcher) Description() string {
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return "error " + m.wrappedMatcher.Description()
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}
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func (m *errorMatcher) Matches(c interface{}) error {
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// Make sure that c is an error.
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e, ok := c.(error)
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if !ok {
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return NewFatalError("which is not an error")
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}
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// Pass on the error text to the wrapped matcher.
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return m.wrappedMatcher.Matches(e.Error())
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}
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