First stab at mock client

client/mock/options.go

@@ -0,0 +1,17 @@
+package mock
+
+import (
+	"github.com/micro/go-micro/client"
+)
+
+// Response sets the response methods for a service
+func Response(service string, response []MockResponse) client.Option {
+	return func(o *client.Options) {
+		r, ok := fromContext(o.Context)
+		if !ok {
+			r = make(map[string][]MockResponse)
+		}
+		r[service] = response
+		o.Context = newContext(o.Context, r)
+	}
+}