Use SignalContext instead of SignalWindow

test/setup-test-node.js

@@ -6,8 +6,8 @@
 const chai = require('chai');
 const chaiAsPromised = require('chai-as-promised');
 
+const { Crypto } = require('../ts/context/Crypto');
 const { setEnvironment, Environment } = require('../ts/environment');
-const { Context: SignalContext } = require('../ts/context');
 const { isValidGuid } = require('../ts/util/isValidGuid');
 
 chai.use(chaiAsPromised);
@@ -18,8 +18,8 @@ const storageMap = new Map();
 
 // To replicate logic we have on the client side
 global.window = {
-  SignalContext: undefined,
-  SignalWindow: {
+  SignalContext: {
+    crypto: new Crypto(),
     log: {
       info: (...args) => console.log(...args),
       warn: (...args) => console.warn(...args),
@@ -34,21 +34,6 @@ global.window = {
   isValidGuid,
 };
 
-const fakeIPC = {
-  sendSync(channel) {
-    // See `ts/context/NativeThemeListener.ts`
-    if (channel === 'native-theme:init') {
-      return { shouldUseDarkColors: true };
-    }
-
-    throw new Error(`Unsupported sendSync channel: ${channel}`);
-  },
-
-  on() {},
-};
-
-global.window.SignalContext = new SignalContext(fakeIPC);
-
 // For ducks/network.getEmptyState()
 global.navigator = {};
 global.WebSocket = {};