Instrumment all sources for coverage

.istanbul.yml

@@ -0,0 +1,19 @@
+instrumentation:
+  root: .
+  default-excludes: true
+  excludes:
+    - '.idea/**'
+    - 'build/**'
+  embed-source: false
+  complete-copy: false
+  include-all-sources: true
+reporting:
+  print: summary
+  reporty:
+    - lcov
+  dir: ./build/coverage
+  watermarks:
+    statements: [99, 100]
+    lines: [99, 100]
+    functions: [99, 100]
+    branches: [99, 100]

package.json

@@ -6,7 +6,7 @@
     "scripts": {
         "pretest": "eslint .",
         "test": "npm run test:unit --coverage && npm run check-coverage",
-        "test:unit": "istanbul test --dir build/coverage _mocha test -- --recursive --reporter dot",
+        "test:unit": "istanbul test _mocha test -- --recursive --reporter dot",
         "check-coverage": "istanbul check-coverage --statement 100 --branch 100 --function 100 --lines 100",
         "coveralls": "cat ./build/coverage/lcov.info | coveralls",
         "changelog": "pr-log"