fixed tsconfig for tests

tsconfig-test.json

@@ -2,6 +2,10 @@
   "compilerOptions": {
     "outDir": "test-tmp",
     "target": "ES6",
+    "lib": [
+      "es2017",
+      "DOM"
+    ],
     "module": "commonjs",
     "inlineSourceMap": true,
     "inlineSources": true,