fix: Terminate broken connections (#179)

Fixes #58

package.json

@@ -24,14 +24,14 @@
     "fix:prettier": "prettier \"src/**/*.ts\" --write",
     "fix:tslint": "tslint --fix --project .",
     "test": "run-s static-checks test:unit",
-    "test:unit": "jest --coverage",
+    "test:unit": "jest --coverage --detectOpenHandles",
     "test:unit:changed": "run-s \"test:unit -- -o\"",
     "static-checks": "run-p static-checks:*",
     "static-checks:lint": "tslint --project .",
     "static-checks:prettier": "prettier \"src/**/*.ts\" --list-different",
     "test:ci:unit": "run-s build test:ci:unit:jest",
-    "test:ci:unit:jest": "jest --config jest.config.ci.js --coverage",
-    "test:integration": "jest --config jest.config.integration.js",
+    "test:ci:unit:jest": "jest --config jest.config.ci.js --coverage --detectOpenHandles",
+    "test:integration": "jest --config jest.config.integration.js --detectOpenHandles",
     "cov": "run-s build test:unit && opn coverage/lcov-report/index.html",
     "doc-api": "typedoc src/index.ts --out build/docs/api",
     "clean": "del-cli build test"
@@ -41,6 +41,7 @@
   },
   "dependencies": {
     "@relaycorp/relaynet-core": "^1.49.1",
+    "abort-controller": "^3.0.0",
     "axios": "^0.21.1",
     "buffer-to-arraybuffer": "0.0.6",
     "it-pipe": "^1.1.0",
@@ -51,7 +52,7 @@
   "devDependencies": {
     "@relaycorp/relaynet-testing": "^1.3.0",
     "@relaycorp/shared-config": "^1.5.3",
-    "@relaycorp/ws-mock": "^2.4.1",
+    "@relaycorp/ws-mock": "^4.2.0",
     "@types/jest": "^26.0.24",
     "@types/verror": "^1.10.5",
     "@types/ws": "^7.4.7",