Several more ensure -add tests

Author: sdboyer

cmd/dep/testdata/harness_tests/ensure/add/nonroot-arg/initial/Gopkg.lock renamed to cmd/dep/testdata/harness_tests/ensure/add/exists-imports/final/Gopkg.lock

@@ -0,0 +1,3 @@
+[[constraint]]
+  name = "github.com/sdboyer/deptesttres"
+  branch = "master"

cmd/dep/testdata/harness_tests/ensure/add/exists-imports/final/Gopkg.toml

@@ -1,13 +1,13 @@
-// Copyright 2016 The Go Authors. All rights reserved.
+// Copyright 2017 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 package main
 
 import (
-	"github.com/sdboyer/deptest"
+	"github.com/sdboyer/deptesttres"
 )
 
 func main() {
-	_ := deptest.Map["yo yo!"]
+	type a deptesttres.Bar
 }

cmd/dep/testdata/harness_tests/ensure/add/exists-imports/initial/Gopkg.toml

@@ -0,0 +1,8 @@
+{
+  "commands": [
+    ["ensure", "-add", "github.com/sdboyer/deptesttres@master"]
+  ],
+  "vendor-final": [
+      "github.com/sdboyer/deptesttres"
+  ]
+}

cmd/dep/testdata/harness_tests/ensure/add/nonroot-arg/initial/main.go renamed to cmd/dep/testdata/harness_tests/ensure/add/exists-imports/initial/main.go

@@ -0,0 +1,7 @@
+[[constraint]]
+  name = "github.com/sdboyer/deptesttres"
+  branch = "master"
+
+[[constraint]]
+  name = "github.com/sdboyer/deptest"
+  version = "1.0.0"

cmd/dep/testdata/harness_tests/ensure/add/exists-imports/testcase.json

@@ -0,0 +1,7 @@
+[[constraint]]
+  name = "github.com/sdboyer/deptesttres"
+  branch = "master"
+
+[[constraint]]
+  name = "github.com/sdboyer/deptest"
+  version = "1.0.0"

cmd/dep/testdata/harness_tests/ensure/add/nonroot-arg/final/Gopkg.lock renamed to cmd/dep/testdata/harness_tests/ensure/add/exists-manifest-constraint/final/Gopkg.lock

@@ -0,0 +1,13 @@
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"github.com/sdboyer/deptesttres"
+)
+
+func main() {
+	type a deptesttres.Bar
+}