1 files changed, 74 insertions, 0 deletions
diff --git a/src/mongo/gotools/vendor/src/github.com/jacobsa/oglematchers/panics.go b/src/mongo/gotools/vendor/src/github.com/jacobsa/oglematchers/panics.go
new file mode 100644
index 00000000000..d2cfc97869b
--- /dev/null
+++ b/src/mongo/gotools/vendor/src/github.com/jacobsa/oglematchers/panics.go
@@ -0,0 +1,74 @@
+// Copyright 2011 Aaron Jacobs. All Rights Reserved.
+// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package oglematchers
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+)
+
+// Panics matches zero-arg functions which, when invoked, panic with an error
+// that matches the supplied matcher.
+//
+// NOTE(jacobsa): This matcher cannot detect the case where the function panics
+// using panic(nil), by design of the language. See here for more info:
+//
+//     http://goo.gl/9aIQL
+//
+func Panics(m Matcher) Matcher {
+	return &panicsMatcher{m}
+}
+
+type panicsMatcher struct {
+	wrappedMatcher Matcher
+}
+
+func (m *panicsMatcher) Description() string {
+	return "panics with: " + m.wrappedMatcher.Description()
+}
+
+func (m *panicsMatcher) Matches(c interface{}) (err error) {
+	// Make sure c is a zero-arg function.
+	v := reflect.ValueOf(c)
+	if v.Kind() != reflect.Func || v.Type().NumIn() != 0 {
+		err = NewFatalError("which is not a zero-arg function")
+		return
+	}
+
+	// Call the function and check its panic error.
+	defer func() {
+		if e := recover(); e != nil {
+			err = m.wrappedMatcher.Matches(e)
+
+			// Set a clearer error message if the matcher said no.
+			if err != nil {
+				wrappedClause := ""
+				if err.Error() != "" {
+					wrappedClause = ", " + err.Error()
+				}
+
+				err = errors.New(fmt.Sprintf("which panicked with: %v%s", e, wrappedClause))
+			}
+		}
+	}()
+
+	v.Call([]reflect.Value{})
+
+	// If we get here, the function didn't panic.
+	err = errors.New("which didn't panic")
+	return
+}