Build our own stub MatrixClient for the tests

It turns out that a bunch of things rely on MatrixClient methods to return
promises rather than undefined. Rather than having to undo half the work done
by sinon.createStubInstance, just build our own object with as many methods as
we need stubbed out.

test/test-utils.js

@@ -1,9 +1,11 @@
 "use strict";
 
+var sinon = require('sinon');
+var q = require('q');
+
 var peg = require('../src/MatrixClientPeg.js');
 var jssdk = require('matrix-js-sdk');
 var MatrixEvent = jssdk.MatrixEvent;
-var sinon = require('sinon');
 
 /**
  * Perform common actions before each test case, e.g. printing the test case
@@ -27,6 +29,21 @@ module.exports.beforeEach = function(context) {
 module.exports.stubClient = function() {
     var sandbox = sinon.sandbox.create();
 
+    var client = {
+        getHomeserverUrl: sinon.stub(),
+        getIdentityServerUrl: sinon.stub(),
+
+        getPushActionsForEvent: sinon.stub(),
+        getRoom: sinon.stub(),
+        loginFlows: sinon.stub(),
+        on: sinon.stub(),
+
+        paginateEventTimeline: sinon.stub().returns(q()),
+        sendReadReceipt: sinon.stub().returns(q()),
+    };
+
+    // create the peg
+
     // 'sandbox.restore()' doesn't work correctly on inherited methods,
     // so we do this for each method
     var methods = ['get', 'unset', 'replaceUsingUrls',
@@ -34,9 +51,7 @@ module.exports.stubClient = function() {
     for (var i = 0; i < methods.length; i++) {
         sandbox.stub(peg, methods[i]);
     }
-
+    peg.get.returns(client);
-    var matrixClientStub = sinon.createStubInstance(jssdk.MatrixClient);
-    peg.get.returns(matrixClientStub);
     return sandbox;
 }