[Tests] run bigint tests in CI with --harmony-bigint flag

.nycrc

@@ -4,8 +4,8 @@
   "instrumentation": false,
   "sourceMap": false,
   "reporter": "html",
-  "lines": 95.95,
-  "statements": 95,
+  "lines": 95.45,
+  "statements": 94.71,
   "functions": 96,
   "branches": 92,
   "exclude": [

.travis.yml

@@ -26,12 +26,15 @@ script:
   - 'if [ -n "${POSTTEST-}" ]; then npm run posttest ; fi'
   - 'if [ -n "${COVERAGE-}" ]; then npm run coverage ; fi'
   - 'if [ -n "${TEST-}" ]; then npm run tests-only ; fi'
+  - 'if [ -n "${BIGINT-}" ]; then npm run test:bigint ; fi'
 sudo: false
 env:
   - TEST=true
 matrix:
   fast_finish: true
   include:
+    - node_js: "10.0"
+      env: BIGINT=true
     - node_js: "node"
       env: COVERAGE=true
     - node_js: "9.10"

package.json

@@ -10,8 +10,10 @@
   },
   "scripts": {
     "test": "npm run tests-only",
+    "posttest": "npm run test:bigint",
     "pretests-only": "node test-core-js",
     "tests-only": "tape test/*.js",
+    "test:bigint": "node --harmony-bigint test/bigint",
     "coverage": "nyc npm run tests-only"
   },
   "testling": {