add coverage check after same-folder example

Author: bahmutov

.circleci/config.yml

@@ -194,6 +194,10 @@ workflows:
             - run:
                 command: npx nyc report --check-coverage true --lines 100 --include unit-utils.js
                 working_directory: examples/same-folder
+            - run:
+                command: node ../../scripts/check-coverage main.js
+            - run:
+                command: node ../../scripts/check-coverage unit-utils.js
 
       - publish:
           filters:

scripts/check-coverage.js

@@ -0,0 +1,47 @@
+const { join } = require('path')
+
+const filename = process.argv[2]
+if (!filename) {
+  console.error('Usage: node %s <file name>', __filename)
+  process.exit(1)
+}
+const coverageFilename = join(process.cwd(), '.nyc_output', 'out.json')
+const coverage = require(coverageFilename)
+const fileCoverageKey = Object.keys(coverage).find(name => {
+  const fileCover = coverage[name]
+  if (fileCover.path.endsWith(filename)) {
+    return fileCover
+  }
+})
+
+if (!fileCoverageKey) {
+  console.error(
+    'Could not find file %s in coverage in file %s',
+    filename,
+    coverageFilename
+  )
+  process.exit(1)
+}
+
+const fileCoverage = coverage[fileCoverageKey]
+const statementCounters = fileCoverage.s
+const isThereUncoveredStatement = Object.keys(statementCounters).some(
+  (k, key) => {
+    return statementCounters[key] === 0
+  }
+)
+if (isThereUncoveredStatement) {
+  console.error(
+    'file %s has statements that were not covered by tests',
+    fileCoverage.path
+  )
+  console.log('statement counters %o', statementCounters)
+
+  process.exit(1)
+}
+
+console.log(
+  'All statements in file %s (found for %s) were covered',
+  fileCoverage.path,
+  filename
+)