Added all required dependencies

vendor/github.com/smartystreets/assertions/serializer.go

@@ -0,0 +1,69 @@
+package assertions
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/smartystreets/assertions/internal/go-render/render"
+)
+
+type Serializer interface {
+	serialize(expected, actual interface{}, message string) string
+	serializeDetailed(expected, actual interface{}, message string) string
+}
+
+type failureSerializer struct{}
+
+func (self *failureSerializer) serializeDetailed(expected, actual interface{}, message string) string {
+	view := FailureView{
+		Message:  message,
+		Expected: render.Render(expected),
+		Actual:   render.Render(actual),
+	}
+	serialized, err := json.Marshal(view)
+	if err != nil {
+		return message
+	}
+	return string(serialized)
+}
+
+func (self *failureSerializer) serialize(expected, actual interface{}, message string) string {
+	view := FailureView{
+		Message:  message,
+		Expected: fmt.Sprintf("%+v", expected),
+		Actual:   fmt.Sprintf("%+v", actual),
+	}
+	serialized, err := json.Marshal(view)
+	if err != nil {
+		return message
+	}
+	return string(serialized)
+}
+
+func newSerializer() *failureSerializer {
+	return &failureSerializer{}
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+// This struct is also declared in github.com/smartystreets/goconvey/convey/reporting.
+// The json struct tags should be equal in both declarations.
+type FailureView struct {
+	Message  string `json:"Message"`
+	Expected string `json:"Expected"`
+	Actual   string `json:"Actual"`
+}
+
+///////////////////////////////////////////////////////
+
+// noopSerializer just gives back the original message. This is useful when we are using
+// the assertions from a context other than the web UI, that requires the JSON structure
+// provided by the failureSerializer.
+type noopSerializer struct{}
+
+func (self *noopSerializer) serialize(expected, actual interface{}, message string) string {
+	return message
+}
+func (self *noopSerializer) serializeDetailed(expected, actual interface{}, message string) string {
+	return message
+}