[Persistence] Spec for CouchDocument

Fill in spec for CouchDocument, which wraps domain object
models with suitable metadata for persistence. WTD-537.

platform/persistence/test/CouchDocumentSpec.js

@@ -8,8 +8,34 @@ define(
     function (CouchDocument) {
         "use strict";
 
+        // Don't complain about _id or _rev; these are the CouchDB
+        // fields that must be used.
+        /*jslint nomen: true */
         describe("A couch document", function () {
+            it("includes an id", function () {
+                expect(new CouchDocument("testId", {})._id)
+                    .toEqual("testId");
+            });
 
+            it("includes a rev only when one is provided", function () {
+                expect(new CouchDocument("testId", {})._rev)
+                    .not.toBeDefined();
+                expect(new CouchDocument("testId", {}, "testRev")._rev)
+                    .toEqual("testRev");
+            });
+
+            it("includes the provided model", function () {
+                var model = { someKey: "some value" };
+                expect(new CouchDocument("testId", model).model)
+                    .toEqual(model);
+            });
+
+            it("marks documents as deleted only on request", function () {
+                expect(new CouchDocument("testId", {}, "testRev")._deleted)
+                    .not.toBeDefined();
+                expect(new CouchDocument("testId", {}, "testRev", true)._deleted)
+                    .toBe(true);
+            });
         });
     }
 );