Check parsed results for total property

Fixes #113

Author: kriszyp

Request.js

@@ -135,25 +135,31 @@ define([
 				headers: headers
 			});
 			var collection = this;
+			var parsedResponse = response.then(function (response) {
+				return collection.parse(response);
+			});
 			return {
-				data: response.then(function (response) {
-					var results = collection.parse(response);
+				data: parsedResponse.then(function (data) {
 					// support items in the results
-					results = results.items || results;
+					var results = data.items || data;
 					for (var i = 0, l = results.length; i < l; i++) {
 						results[i] = collection._restore(results[i], true);
 					}
 					return results;
 				}),
-				total: response.response.then(function (response) {
-					var total = response.data.total;
+				total: parsedResponse.then(function (data) {
+					// check for a total property
+					var total = data.total;
 					if (total > -1) {
 						// if we have a valid positive number from the data,
 						// we can use that
 						return total;
 					}
-					var range = response.getHeader('Content-Range');
-					return range && (range = range.match(/\/(.*)/)) && +range[1];
+					// else use headers
+					return response.response.then(function (response) {
+						var range = response.getHeader('Content-Range');
+						return range && (range = range.match(/\/(.*)/)) && +range[1];
+					});
 				}),
 				response: response.response
 			};

tests/Request.js

@@ -47,9 +47,16 @@ define([
 			expected = rangeArgs;
 			results = collection.fetch();
 		} else {
+			mockRequest.setResponseHeaders({
+				'Content-Range': rangeArgs.start + '-' + rangeArgs.end + '/' + expectedResults.length
+			});
 			results = collection.fetchRange(rangeArgs);
+			results = results.totalLength.then(function (totalLength) {
+				assert.strictEqual(totalLength, expectedResults.length);
+				return results;
+			});
 		}
-		return when(results).then(function (results) {
+		return results.then(function (results) {
 			expected.headers && mockRequest.assertRequestHeaders(expected.headers);
 			expected.queryParams && mockRequest.assertQueryParams(expected.queryParams);