schema: add layout test

schema/fs.go

@@ -205,7 +205,7 @@ var _escData = map[string]*_escFile{
 	"/config-schema.json": {
 		local:   "config-schema.json",
 		size:    2771,
-		modtime: 1495785272,
+		modtime: 1498025574,
 		compressed: `
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@@ -223,7 +223,7 @@ b1D07fCyW0vviMlWxN4UcYpZ/Enjdtf+RQ3SGiZ/vj8oANpKu/UTMV9kR1SDMjPzGZ6y5MQwnZvwWfX7
 	"/content-descriptor.json": {
 		local:   "content-descriptor.json",
 		size:    1085,
-		modtime: 1495785272,
+		modtime: 1498025574,
 		compressed: `
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@@ -238,7 +238,7 @@ ERcrb5b9zhBc4s2zO7r2jN/2xKhin3+/McttXS9NB/Cle+p+BgAA///HjexwPQQAAA==
 	"/defs-descriptor.json": {
 		local:   "defs-descriptor.json",
 		size:    922,
-		modtime: 1495785272,
+		modtime: 1498025574,
 		compressed: `
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@@ -254,7 +254,7 @@ ELULBvNXEJvAYtB3LzDQWpfw5fX8n7t46Dc2PQ1UZz9FdVw8RGdPyoPfojTor7ve+/cw50l+dpOfAQAA
 	"/defs.json": {
 		local:   "defs.json",
 		size:    1670,
-		modtime: 1495785272,
+		modtime: 1498025574,
 		compressed: `
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@@ -269,7 +269,7 @@ fIvD7in0ryMEy+fK1G6UfmdTE+tvpoL+1wV/AgAA//96IpqyhgYAAA==
 	"/image-index-schema.json": {
 		local:   "image-index-schema.json",
 		size:    2993,
-		modtime: 1495785272,
+		modtime: 1498025574,
 		compressed: `
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@@ -289,7 +289,7 @@ mOlZmY29BDtPuBnA42w9+xsAAP//IKe/nbELAAA=
 	"/image-layout-schema.json": {
 		local:   "image-layout-schema.json",
 		size:    439,
-		modtime: 1495785272,
+		modtime: 1498025574,
 		compressed: `
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@@ -302,7 +302,7 @@ HrRoV8JRtyHJaO0DOruZpYLJtaZsrM/FWEi+BMysfzuhXbUQfcDIhEkZyG2yQyYl8TPGJLVk97fth1yA
 	"/image-manifest-schema.json": {
 		local:   "image-manifest-schema.json",
 		size:    921,
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+		modtime: 1498025574,
 		compressed: `
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schema/imagelayout_test.go

@@ -0,0 +1,56 @@
+// Copyright 2016 The Linux Foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package schema_test
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/opencontainers/image-spec/schema"
+)
+
+func TestImageLayout(t *testing.T) {
+	for i, tt := range []struct {
+		imageLayout string
+		fail        bool
+	}{
+		// expected faulure:  imageLayoutVersion does not match pattern
+		{
+			imageLayout: `
+{
+  "imageLayoutVersion": 1.0.0
+}
+`,
+			fail: true,
+		},
+
+		// validate layout
+		{
+			imageLayout: `
+{
+  "imageLayoutVersion": "1.0.0"
+}
+`,
+			fail: false,
+		},
+	} {
+		r := strings.NewReader(tt.imageLayout)
+		err := schema.ValidatorMediaTypeLayoutHeader.Validate(r)
+
+		if got := err != nil; tt.fail != got {
+			t.Errorf("test %d: expected validation failure %t but got %t, err %v", i, tt.fail, got, err)
+		}
+	}
+}