Add proxy routing and sing-box support

packages/flutter_mozilla_components/javascript/container_proxy/test/unit/BackgroundMain.test.ts

@@ -1,4 +1,4 @@
-import BackgroundMain, { doNotProxy } from '../../src/background/BackgroundMain'
+import BackgroundMain, { doNotProxy, emergencyBreak } from '../../src/background/BackgroundMain'
 import { Store } from '../../src/store/Store'
 
 import { expect } from 'chai'
@@ -41,6 +41,16 @@ describe('BackgroundMain', function () {
       expect(result).to.be.not.empty
     })
 
+    it('should block if an assigned proxy no longer exists', async () => {
+      const isolatedStore = new Store()
+      const isolatedBackgroundMain = new BackgroundMain({ store: isolatedStore })
+      isolatedStore.setContainerProxyRelation('general', 'missing-proxy')
+
+      const result = await isolatedBackgroundMain.onRequest({ cookieStoreId: 'firefox-default', url: 'https://google.com', tabId: 0 })
+
+      expect(result).to.be.deep.equal([emergencyBreak])
+    })
+
     it('should remove doNotProxyLocal flag from proxy settings if proxy is set up', async () => {
       await givenSomeProxyIsSetUpForContainer({ containerId: 'firefox-default', host: undefined, doNotProxyLocal: undefined })
 

packages/flutter_mozilla_components/javascript/container_proxy/test/unit/Store.test.ts

@@ -163,6 +163,15 @@ describe('Store', () => {
       expect(relations.container1).to.be.deep.equal(['proxy1'])
       expect(relations.container2).to.be.deep.equal(['proxy2'])
     })
+
+    it('should keep a missing proxy relation distinguishable from no relation', () => {
+      const isolatedStore = new Store()
+      isolatedStore.setContainerProxyRelation('container1', 'deleted-proxy')
+
+      const result = isolatedStore.getProxiesForContainer('container1')
+
+      expect(result).to.be.deep.equal([])
+    })
   })
 
   describe('wildcard site assignments', function () {