add require

vendor/github.com/stretchr/testify/require/doc.go

+// Package require implements the same assertions as the `assert` package but
+// stops test execution when a test fails.
+//
+// Example Usage
+//
+// The following is a complete example using require in a standard test function:
+//    import (
+//      "testing"
+//      "github.com/stretchr/testify/require"
+//    )
+//
+//    func TestSomething(t *testing.T) {
+//
+//      var a string = "Hello"
+//      var b string = "Hello"
+//
+//      require.Equal(t, a, b, "The two words should be the same.")
+//
+//    }
+//
+// Assertions
+//
+// The `require` package have same global functions as in the `assert` package,
+// but instead of returning a boolean result they call `t.FailNow()`.
+//
+// Every assertion function also takes an optional string message as the final argument,
+// allowing custom error messages to be appended to the message the assertion method outputs.
+package require

vendor/github.com/stretchr/testify/require/forward_requirements.go

+package require
+
+// Assertions provides assertion methods around the
+// TestingT interface.
+type Assertions struct {
+	t TestingT
+}
+
+// New makes a new Assertions object for the specified TestingT.
+func New(t TestingT) *Assertions {
+	return &Assertions{
+		t: t,
+	}
+}
+
+//go:generate go run ../_codegen/main.go -output-package=require -template=require_forward.go.tmpl -include-format-funcs

vendor/github.com/stretchr/testify/require/require.go.tmpl

+{{.Comment}}
+func {{.DocInfo.Name}}(t TestingT, {{.Params}}) {
+	if !assert.{{.DocInfo.Name}}(t, {{.ForwardedParams}}) {
+		t.FailNow()
+	}
+}

vendor/github.com/stretchr/testify/require/require_forward.go.tmpl

+{{.CommentWithoutT "a"}}
+func (a *Assertions) {{.DocInfo.Name}}({{.Params}}) {
+	{{.DocInfo.Name}}(a.t, {{.ForwardedParams}})
+}

vendor/github.com/stretchr/testify/require/requirements.go

+package require
+
+// TestingT is an interface wrapper around *testing.T
+type TestingT interface {
+	Errorf(format string, args ...interface{})
+	FailNow()
+}
+
+//go:generate go run ../_codegen/main.go -output-package=require -template=require.go.tmpl -include-format-funcs

vendor/vendor.json

@@ -232,6 +232,7 @@
 		{"path":"github.com/spf13/pflag","checksumSHA1":"Q52Y7t0lEtk/wcDn5q7tS7B+jqs=","revision":"7aff26db30c1be810f9de5038ec5ef96ac41fd7c","revisionTime":"2017-08-24T17:57:12Z"},
 		{"path":"github.com/stretchr/objx","checksumSHA1":"K0crHygPTP42i1nLKWphSlvOQJw=","revision":"1a9d0bb9f541897e62256577b352fdbc1fb4fd94","revisionTime":"2015-09-28T12:21:52Z"},
 		{"path":"github.com/stretchr/testify/mock","checksumSHA1":"o+jsS/rxceTym4M3reSPfrPxaio=","revision":"f6abca593680b2315d2075e0f5e2a9751e3f431a","revisionTime":"2017-06-01T20:57:54Z"},
+		{"path":"github.com/stretchr/testify/require","checksumSHA1":"7vs6dSc1PPGBKyzb/SCIyeMJPLQ=","revision":"f6abca593680b2315d2075e0f5e2a9751e3f431a","revisionTime":"2017-06-01T20:57:54Z"},
 		{"path":"github.com/ugorji/go/codec","checksumSHA1":"8G1zvpE4gTtWQRuP/x2HPVDmflo=","revision":"0053ebfd9d0ee06ccefbfe17072021e1d4acebee","revisionTime":"2017-06-20T06:01:02Z"},
 		{"path":"github.com/ugorji/go/codec/codecgen","checksumSHA1":"OgParimNuU2CJqr3pcTympeQZUc=","revision":"5efa3251c7f7d05e5d9704a69a984ec9f1386a40","revisionTime":"2017-06-20T10:48:52Z"},
 		{"path":"github.com/ulikunitz/xz","checksumSHA1":"z2kAtVle4NFV2OExI85fZoTcsI4=","revision":"0c6b41e72360850ca4f98dc341fd999726ea007f","revisionTime":"2017-06-05T21:53:11Z"},