build: use nyc for test coverage

.gitignore

@@ -1,3 +1,4 @@
+.nyc_output/
 coverage/
 node_modules/
 npm-debug.log

.travis.yml

@@ -11,5 +11,25 @@ before_install:
   # Setup npm
   - "test $TRAVIS_NODE_VERSION != '0.8' || npm install -g npm@1.2.8000"
   - "npm config set shrinkwrap false"
+  # Setup Node.js version-specific dependencies
+  - |
+    # nyc for coverage
+    # - remove for Node.js < 6
+    if [[ "$(cut -d. -f1 <<< "$TRAVIS_NODE_VERSION")" -lt 6 ]]; then
+      npm rm --silent --save-dev nyc
+    fi
+script:
+  # Run test script
+  - |
+    if npm -ps ls nyc | grep -q nyc; then
+      npm run test-cov
+    else
+      npm test
+    fi
 after_script:
-  - "test -e ./coverage/lcov.info && npm install coveralls@2 && coveralls < ./coverage/lcov.info"
+  - |
+    # Upload coverage to coveralls if exists
+    if [[ -d .nyc_output ]]; then
+      npm install --save-dev coveralls@2
+      nyc report --reporter=text-lcov | coveralls
+    fi

appveyor.yml

@@ -16,6 +16,8 @@ install:
   - if "%nodejs_version%" equ "0.8" npm config set strict-ssl false
   - if "%nodejs_version%" equ "0.8" npm install -g --prefix "%npm_prefix:~0,-1%" npm@1.2.8000
   - npm config set shrinkwrap false
+  # Remove all non-test dependencies
+  - npm rm --silent --save-dev nyc
   # Install Node.js modules
   - npm install
 build: off

package.json

@@ -14,8 +14,8 @@
     "walk": "2.3.14"
   },
   "devDependencies": {
-    "istanbul": "0.4.5",
     "mocha": "2.5.3",
+    "nyc": "14.1.1",
     "rimraf": "2.7.1",
     "supertest": "1.1.0"
   },
@@ -30,6 +30,7 @@
     "npm": "1.2.8000 || >= 1.4.16"
   },
   "scripts": {
-    "test": "istanbul cover node_modules/mocha/bin/_mocha -- --reporter spec test/*/index.js"
+    "test": "mocha --reporter spec test/*/index.js",
+    "test-cov": "nyc --reporter=html --reporter=text npm test"
   }
 }