feat(jsonReporter): implement first iteration of json reports

bin/index.js

@@ -7,6 +7,7 @@ const logError = require('./utils/logError')
 program
   .version(pkg.version)
   .option('-t, --threshold <number>', 'Specify a custom threshold')
+  .option('-P, --pretty', 'Prettify the output (only with `json` reporter)')
   .option('-r, --reporters <reporters>', 'Specify custom reporters (multiple allowed with comma)')
   .option('-c, --concurrency <numberOfFiles>', 'Number of files that are handled at a time')
   .option('-v, --verbose', 'Run `flow-cov` in verbose mode')
@@ -30,6 +31,10 @@ async function run() {
       config.reporters = program.reporters.split(',')
     }
 
+    if (program.pretty) {
+      config.pretty = program.pretty
+    }
+
     const report = await runCoverageTool(config)
 
     if (report.coverageSatisfied) {

lib/reporters/__test__/json.test.js

@@ -0,0 +1,36 @@
+const report = {
+  filesCoverage: [],
+  coverage: 100,
+  coverageSatisfied: true,
+  flowPassed: true,
+  config: { threshold: 90 },
+}
+
+describe('jsonReporter', () => {
+  beforeEach(() => {
+    global.console = { log: () => {} }
+  })
+
+  test('returns the right reporterName', () => {
+    const reporter = require('../json')
+    const response = reporter(report)
+
+    expect(response.reporterName).toBe('json')
+  })
+
+  test('returns valid stringified json', () => {
+    const reporter = require('../json')
+    const response = reporter(report)
+
+    expect(() => JSON.parse(response.contents)).not.toThrow()
+    expect(JSON.parse(response.contents).coverageSatisfied).toEqual(true)
+  })
+
+  test('works with a pretty option', () => {
+    const reporter = require('../json')
+    const response = reporter({ ...report, config: { ...report.config, pretty: true } })
+
+    expect(() => JSON.parse(response.contents)).not.toThrow()
+    expect(JSON.parse(response.contents).coverageSatisfied).toEqual(true)
+  })
+})

lib/reporters/index.js

@@ -1,7 +1,10 @@
 const textReporter = require('./text')
+const jsonReporter = require('./json')
 
 module.exports = function launchReporter(type, report) {
   switch (type) {
+    case 'json':
+      return jsonReporter(report)
     case 'text':
       return textReporter(report)
     default:

lib/reporters/json.js

@@ -0,0 +1,10 @@
+module.exports = function jsonReporter(report) {
+  const contents = JSON.stringify(report, null, report.config.pretty ? 2 : 0)
+
+  console.log(contents)
+
+  return {
+    reporterName: 'json',
+    contents,
+  }
+}