pkg/shelf: rename Stack to Pipeline

pkg/shelf/test/create_middleware_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library shelf.create_middleware_test;
 
 import 'dart:async';
 
 import 'package:shelf/shelf.dart';
 import 'package:unittest/unittest.dart';
 
 import 'test_util.dart';
 
 void main() {
   test('forwards the request and response if both handlers are null', () {
-    var handler = const Stack()
+    var handler = const Pipeline()
         .addMiddleware(createMiddleware())
         .addHandler((request) {
           return syncHandler(request, headers: {'from' : 'innerHandler'});
         });
 
     return makeSimpleRequest(handler).then((response) {
       expect(response.headers['from'], 'innerHandler');
     });
   });
 
   group('requestHandler', () {
     test('sync null response forwards to inner handler', () {
-      var handler = const Stack()
+      var handler = const Pipeline()
           .addMiddleware(createMiddleware(requestHandler: (request) => null))
           .addHandler(syncHandler);
 
       return makeSimpleRequest(handler).then((response) {
         expect(response.headers['from'], isNull);
       });
     });
 
     test('async null response forwards to inner handler', () {
-      var handler = const Stack()
+      var handler = const Pipeline()
           .addMiddleware(createMiddleware(
               requestHandler: (request) => new Future.value(null)))
           .addHandler(syncHandler);
 
       return makeSimpleRequest(handler).then((response) {
         expect(response.headers['from'], isNull);
       });
     });
 
     test('sync response is returned', () {
-      var handler = const Stack()
+      var handler = const Pipeline()
           .addMiddleware(createMiddleware(
               requestHandler: (request) => _middlewareResponse))
           .addHandler(_failHandler);
 
       return makeSimpleRequest(handler).then((response) {
         expect(response.headers['from'], 'middleware');
       });
     });
 
     test('async response is returned', () {
-      var handler = const Stack()
+      var handler = const Pipeline()
           .addMiddleware(createMiddleware(requestHandler: (request) =>
               new Future.value(_middlewareResponse)))
           .addHandler(_failHandler);
 
       return makeSimpleRequest(handler).then((response) {
         expect(response.headers['from'], 'middleware');
       });
     });
 
     group('with responseHandler', () {
       test('with sync result, responseHandler is not called', () {
         var middleware = createMiddleware(
             requestHandler: (request) => _middlewareResponse,
             responseHandler: (response) => fail('should not be called'));
 
-        var handler = const Stack()
+        var handler = const Pipeline()
             .addMiddleware(middleware)
             .addHandler(syncHandler);
 
         return makeSimpleRequest(handler).then((response) {
           expect(response.headers['from'], 'middleware');
         });
       });
 
       test('with async result, responseHandler is not called', () {
         var middleware = createMiddleware(
             requestHandler: (request) => new Future.value(_middlewareResponse),
             responseHandler: (response) => fail('should not be called'));
-        var handler = const Stack()
+        var handler = const Pipeline()
             .addMiddleware(middleware)
             .addHandler(syncHandler);
 
         return makeSimpleRequest(handler).then((response) {
           expect(response.headers['from'], 'middleware');
         });
       });
     });
   });
 
   group('responseHandler', () {
     test('innerHandler sync response is seen, replaced value continues', () {
-      var handler = const Stack().addMiddleware(createMiddleware(
+      var handler = const Pipeline().addMiddleware(createMiddleware(
           responseHandler: (response) {
         expect(response.headers['from'], 'handler');
         return _middlewareResponse;
       })).addHandler((request) {
         return syncHandler(request, headers: {'from' : 'handler'} );
       });
 
       return makeSimpleRequest(handler).then((response) {
         expect(response.headers['from'], 'middleware');
       });
     });
 
     test('innerHandler async response is seen, async value continues', () {
-      var handler = const Stack().addMiddleware(
+      var handler = const Pipeline().addMiddleware(
           createMiddleware(responseHandler: (response) {
         expect(response.headers['from'], 'handler');
         return new Future.value(_middlewareResponse);
       })).addHandler((request) {
         return new Future(() => syncHandler(
             request, headers: {'from' : 'handler'} ));
       });
 
       return makeSimpleRequest(handler).then((response) {
         expect(response.headers['from'], 'middleware');
       });
     });
   });
 
   group('error handling', () {
     test('sync error thrown by requestHandler bubbles down', () {
-      var handler = const Stack()
+      var handler = const Pipeline()
           .addMiddleware(createMiddleware(
               requestHandler: (request) => throw 'middleware error'))
           .addHandler(_failHandler);
 
       expect(makeSimpleRequest(handler), throwsA('middleware error'));
     });
 
     test('async error thrown by requestHandler bubbles down', () {
-      var handler = const Stack()
+      var handler = const Pipeline()
           .addMiddleware(createMiddleware(requestHandler: (request) =>
               new Future.error('middleware error')))
           .addHandler(_failHandler);
 
       expect(makeSimpleRequest(handler), throwsA('middleware error'));
     });
 
     test('throw from responseHandler does not hit error handler', () {
       var middleware = createMiddleware(responseHandler: (response) {
         throw 'middleware error';
       }, errorHandler: (e, s) => fail('should never get here'));
 
-      var handler = const Stack().addMiddleware(middleware)
+      var handler = const Pipeline().addMiddleware(middleware)
           .addHandler(syncHandler);
 
       expect(makeSimpleRequest(handler), throwsA('middleware error'));
     });
 
     test('requestHandler throw does not hit errorHandlers', () {
       var middleware = createMiddleware(
           requestHandler: (request) {
             throw 'middleware error';
           },
           errorHandler: (e, s) => fail('should never get here'));
 
-      var handler = const Stack().addMiddleware(middleware)
+      var handler = const Pipeline().addMiddleware(middleware)
           .addHandler(syncHandler);
 
       expect(makeSimpleRequest(handler), throwsA('middleware error'));
     });
 
     test('inner handler throws, is caught by errorHandler with response', () {
       var middleware = createMiddleware(
           errorHandler: (error, stack) {
             expect(error, 'bad handler');
             return _middlewareResponse;
           });
 
-      var handler = const Stack().addMiddleware(middleware)
+      var handler = const Pipeline().addMiddleware(middleware)
           .addHandler((request) {
         throw 'bad handler';
       });
 
       return makeSimpleRequest(handler).then((response) {
         expect(response.headers['from'], 'middleware');
       });
     });
 
     test('inner handler throws, is caught by errorHandler and rethrown', () {
       var middleware = createMiddleware(errorHandler: (error, stack) {
         expect(error, 'bad handler');
         throw error;
       });
 
-      var handler = const Stack().addMiddleware(middleware)
+      var handler = const Pipeline().addMiddleware(middleware)
           .addHandler((request) {
         throw 'bad handler';
       });
 
       expect(makeSimpleRequest(handler), throwsA('bad handler'));
     });
   });
 }
 
 _failHandler(Request request) => fail('should never get here');
 
 final Response _middlewareResponse =
     new Response.ok('middleware content', headers: {'from': 'middleware'});