1 files changed, 51 insertions, 0 deletions
diff --git a/src/mongo/gotools/vendor/src/github.com/jacobsa/oglematchers/error.go b/src/mongo/gotools/vendor/src/github.com/jacobsa/oglematchers/error.go
new file mode 100644
index 00000000000..8a078e36d86
--- /dev/null
+++ b/src/mongo/gotools/vendor/src/github.com/jacobsa/oglematchers/error.go
@@ -0,0 +1,51 @@
+// 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
+
+// Error returns a matcher that matches non-nil values implementing the
+// built-in error interface for whom the return value of Error() matches the
+// supplied matcher.
+//
+// For example:
+//
+//     err := errors.New("taco burrito")
+//
+//     Error(Equals("taco burrito"))  // matches err
+//     Error(HasSubstr("taco"))       // matches err
+//     Error(HasSubstr("enchilada"))  // doesn't match err
+//
+func Error(m Matcher) Matcher {
+	return &errorMatcher{m}
+}
+
+type errorMatcher struct {
+	wrappedMatcher Matcher
+}
+
+func (m *errorMatcher) Description() string {
+	return "error " + m.wrappedMatcher.Description()
+}
+
+func (m *errorMatcher) Matches(c interface{}) error {
+	// Make sure that c is an error.
+	e, ok := c.(error)
+	if !ok {
+		return NewFatalError("which is not an error")
+	}
+
+	// Pass on the error text to the wrapped matcher.
+	return m.wrappedMatcher.Matches(e.Error())
+}