Add short coverage summary.

integration_tests/__tests__/__snapshots__/coverage_report-test.js.snap

@@ -8,6 +8,15 @@ All files |      100 |      100 |      100 |      100 |                |
 "
 `;
 
+exports[`test json reporter printing with --coverage 1`] = `
+"Coverage Summary (add \"text\" to the \"coverageReporter\" setting to receive a full report)
+ › Statements: 100%
+ › Branches: 100%
+ › Lines: 100%
+ › Functions: 100%
+"
+`;
+
 exports[`test outputs coverage report 1`] = `
 "-------------------------------|----------|----------|----------|----------|----------------|
 File                           |  % Stmts | % Branch |  % Funcs |  % Lines |Uncovered Lines |

integration_tests/__tests__/coverage_report-test.js

@@ -18,7 +18,7 @@ const DIR = path.resolve(__dirname, '../coverage_report');
 
 beforeEach(() => linkJestPackage('babel-jest', DIR));
 
-it('outputs coverage report', () => {
+test('outputs coverage report', () => {
   const {stdout, status} = runJest(DIR, ['--no-cache', '--coverage']);
   const coverageDir = path.resolve(__dirname, '../coverage_report/coverage');
 
@@ -33,7 +33,7 @@ it('outputs coverage report', () => {
   expect(status).toBe(0);
 });
 
-it('collects coverage only from specified files', () => {
+test('collects coverage only from specified files', () => {
   const {stdout} = runJest(DIR, [
     '--no-cache',
     '--coverage',
@@ -44,3 +44,16 @@ it('collects coverage only from specified files', () => {
   // Coverage report should only have `setup.js` coverage info
   expect(stdout).toMatchSnapshot();
 });
+
+test('json reporter printing with --coverage', () => {
+  const result = runJest('json_reporter', ['--coverage']);
+  let stderr =
+    ('Coverage' + result.stderr.toString().split('Coverage')[1]).split('\n');
+  stderr.pop();
+  stderr.pop();
+  stderr = stderr.join('\n');
+
+  expect(result.status).toBe(1);
+
+  expect(stderr).toMatchSnapshot();
+});

integration_tests/console/__tests__/console2-test.js

@@ -13,7 +13,7 @@ test('works just fine', () => {
   return new Promise(resolve => {
     // Make the second test finish last to get consistent console
     // output
-    setTimeout(resolve, 3000);
+    setTimeout(resolve, 2000);
   }).then(() => {
     console.error('This is an error from another test file.');
   });

integration_tests/json_reporter/__tests__/sum-test.js

@@ -7,8 +7,6 @@
  */
 'use strict';
 
-jest.unmock('../sum');
-
 const sum = require('../sum');
 
 describe('sum', () => {

integration_tests/json_reporter/package.json

@@ -1,5 +1,6 @@
 {
   "jest": {
-    "testEnvironment": "node"
+    "testEnvironment": "node",
+    "coverageReporters": ["json"]
   }
 }

packages/jest-cli/src/reporters/CoverageReporter.js

@@ -28,6 +28,7 @@ const fs = require('fs');
 const generateEmptyCoverage = require('../generateEmptyCoverage');
 const istanbulCoverage = require('istanbul-lib-coverage');
 
+const COVERAGE_SUMMARY = chalk.bold;
 const FAIL_COLOR = chalk.bold.red;
 const RUNNING_TEST_COLOR = chalk.bold.gray;
 
@@ -62,6 +63,23 @@ class CoverageReporter extends BaseReporter {
       }
       reporter.addAll(config.coverageReporters || []);
       reporter.write(this._coverageMap);
+
+      if (
+        config.coverageReporters &&
+        config.coverageReporters.length &&
+        !config.coverageReporters.includes('text')
+      ) {
+        const results = this._coverageMap.getCoverageSummary().toJSON();
+        const format = percent => percent + (percent === 'Unknown' ? '' : '%');
+        this.log(
+          '\n' + COVERAGE_SUMMARY('Coverage Summary') + ' (add "text" to the ' +
+          '"coverageReporter" setting to receive a full report)\n' +
+          ' \u203A Statements: ' + format(results.statements.pct) + '\n' +
+          ' \u203A Branches: ' + format(results.branches.pct) + '\n' +
+          ' \u203A Lines: ' + format(results.lines.pct) + '\n' +
+          ' \u203A Functions: ' + format(results.functions.pct) + '\n',
+        );
+      }
     } catch (e) {
       console.error(chalk.red(`
         Failed to write coverage reports:
@@ -76,7 +94,7 @@ class CoverageReporter extends BaseReporter {
   _addUntestedFiles(config: Config, runnerContext: RunnerContext) {
     if (config.collectCoverageFrom && config.collectCoverageFrom.length) {
       process.stderr.write(RUNNING_TEST_COLOR(
-        'Running coverage for untested files...',
+        'Running coverage on untested files...',
       ));
       const files = runnerContext.hasteFS.matchFilesWithGlob(
         config.collectCoverageFrom,
@@ -106,7 +124,7 @@ class CoverageReporter extends BaseReporter {
 
   _checkThreshold(config: Config) {
     if (config.coverageThreshold) {
-      const globalResults = this._coverageMap.getCoverageSummary().toJSON();
+      const results = this._coverageMap.getCoverageSummary().toJSON();
 
       function check(name, thresholds, actuals) {
         return [
@@ -140,7 +158,7 @@ class CoverageReporter extends BaseReporter {
       const errors = check(
         'global',
         config.coverageThreshold.global,
-        globalResults,
+        results,
       );
 
       if (errors.length > 0) {