Merge pull request #580 from q384566678/descr-test

descriptor-test: add test

Author: jonboulle

schema/descriptor_test.go

@@ -199,6 +199,21 @@ func TestDescriptor(t *testing.T) {
   "size": 7682,
   "digest": "sha256:5B0BCABD1ED22E9FB1310CF6C2DEC7CDEF19F0AD69EFA1F392E94A4333501270"
 }
+`,
+			fail: true,
+		},
+
+		// expected failure: urls does not match format (invalide url characters)
+		{
+			descriptor: `
+{
+  "mediaType": "application/vnd.oci.image.manifest.v1+json",
+  "size": 7682,
+  "digest": "sha256:5b0bcabd1ed22e9fb1310cf6c2dec7cdef19f0ad69efa1f392e94a4333501270",
+  "urls": [
+    "value"
+  ]
+}
 `,
 			fail: true,
 		},