Memory storage: throw 404 if attachment is undefined

src/jio.storage/memorystorage.js

@@ -81,7 +81,14 @@
 
   MemoryStorage.prototype.getAttachment = function (param) {
     try {
-      return {data: this._database[param._id].attachments[param._attachment]};
+      var result = this._database[param._id].attachments[param._attachment];
+      if (result === undefined) {
+        throw new jIO.util.jIOError(
+          "Cannot find attachment: " + param._id + " , " + param._attachment,
+          404
+        );
+      }
+      return {data: result};
     } catch (error) {
       if (error instanceof TypeError) {
         throw new jIO.util.jIOError(

test/jio.storage/memorystorage.tests.js

@@ -273,6 +273,34 @@
       });
   });
 
+  test("get inexistent attachment from document with other attachments",
+       function () {
+      var id = "b";
+      stop();
+      expect(3);
+
+      this.jio.__storage._database[id] = {
+        "doc": JSON.stringify({}),
+        attachments: {"foo": "bar"}
+      };
+
+      this.jio.getAttachment({
+        "_id": id,
+        "_attachment": "inexistent"
+      })
+        .fail(function (error) {
+          ok(error instanceof jIO.util.jIOError);
+          equal(error.message, "Cannot find attachment: b , inexistent");
+          equal(error.status_code, 404);
+        })
+        .fail(function (error) {
+          ok(false, error);
+        })
+        .always(function () {
+          start();
+        });
+    });
+
   test("get attachment from document", function () {
     var id = "putattmt1",
       attachment = "putattmt2",