Test error behavior from regular test suite

crossdock/client/errors/behavior.go

@@ -233,7 +233,11 @@ func Run(s behavior.Sink, ps behavior.Params) {
 				"%s: response body should be informative error", tt.name)
 		}
 		if tt.wantBodyStartsWith != "" {
-			body := res.Body[:len(tt.wantBodyStartsWith)]
+			i := len(tt.wantBodyStartsWith)
+			if i > len(res.Body) {
+				i = len(res.Body)
+			}
+			body := res.Body[:i]
 			assert.Equal(tt.wantBodyStartsWith, body,
 				"%s: response body should be informative error", tt.name)
 		}

crossdock/client/errors/behavior_test.go

@@ -0,0 +1,59 @@
+// Copyright (c) 2016 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package errors
+
+import (
+	"testing"
+
+	"github.com/yarpc/yarpc-go"
+	"github.com/yarpc/yarpc-go/crossdock/client/behavior"
+	"github.com/yarpc/yarpc-go/crossdock/server"
+	"github.com/yarpc/yarpc-go/encoding/json"
+	"github.com/yarpc/yarpc-go/transport"
+	"github.com/yarpc/yarpc-go/transport/http"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRun(t *testing.T) {
+	rpc := yarpc.New(yarpc.Config{
+		Name:     "yarpc-test",
+		Inbounds: []transport.Inbound{http.NewInbound(":8081")},
+	})
+
+	json.Register(rpc, json.Procedure("echo", server.EchoJSON))
+	json.Register(rpc, json.Procedure("unexpected-error", server.UnexpectedError))
+	json.Register(rpc, json.Procedure("bad-response", server.BadResponse))
+
+	require.NoError(t, rpc.Start(), "failed to start RPC server")
+	defer rpc.Stop()
+
+	params := behavior.ParamsFromMap{"server": "localhost"}
+	entries := behavior.Run(func(s behavior.Sink) {
+		Run(s, params)
+	})
+
+	for _, entry := range entries {
+		e := entry.(behavior.Entry)
+		assert.Equal(t, behavior.Passed, e.Status, e.Output)
+	}
+}