74 lines
2 KiB
Go
74 lines
2 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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import (
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"errors"
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"fmt"
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"reflect"
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)
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// Panics matches zero-arg functions which, when invoked, panic with an error
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// that matches the supplied matcher.
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//
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// NOTE(jacobsa): This matcher cannot detect the case where the function panics
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// using panic(nil), by design of the language. See here for more info:
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//
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// http://goo.gl/9aIQL
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//
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func Panics(m Matcher) Matcher {
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return &panicsMatcher{m}
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}
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type panicsMatcher struct {
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wrappedMatcher Matcher
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}
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func (m *panicsMatcher) Description() string {
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return "panics with: " + m.wrappedMatcher.Description()
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}
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func (m *panicsMatcher) Matches(c interface{}) (err error) {
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// Make sure c is a zero-arg function.
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v := reflect.ValueOf(c)
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if v.Kind() != reflect.Func || v.Type().NumIn() != 0 {
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err = NewFatalError("which is not a zero-arg function")
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return
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}
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// Call the function and check its panic error.
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defer func() {
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if e := recover(); e != nil {
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err = m.wrappedMatcher.Matches(e)
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// Set a clearer error message if the matcher said no.
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if err != nil {
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wrappedClause := ""
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if err.Error() != "" {
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wrappedClause = ", " + err.Error()
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}
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err = errors.New(fmt.Sprintf("which panicked with: %v%s", e, wrappedClause))
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}
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}
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}()
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v.Call([]reflect.Value{})
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// If we get here, the function didn't panic.
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err = errors.New("which didn't panic")
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return
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}
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