feat: use snapshot testing

Author: laggingreflex

package.json

@@ -47,6 +47,7 @@
   },
   "devDependencies": {
     "chai": "^4.1.2",
+    "chai-jest-snapshot": "^2.0.0",
     "coveralls": "^3.0.2",
     "mocha": "^5.2.0",
     "standard": "^12.0.1",

test/integration.js

@@ -3,8 +3,13 @@
 const { spawnSync } = require('child_process')
 const c8Path = require.resolve('../bin/c8')
 const nodePath = process.execPath
+const chaiJestSnapshot = require('chai-jest-snapshot')
 
-require('chai').should()
+require('chai')
+.use(chaiJestSnapshot)
+.should()
+
+beforeEach(function() { chaiJestSnapshot.configureUsingMochaContext(this) })
 
 describe('c8', () => {
   it('reports coverage for script that exits normally', () => {
@@ -15,14 +20,7 @@ describe('c8', () => {
       nodePath,
       require.resolve('./fixtures/normal')
     ])
-    output.toString('utf8').should.include(`
------------|----------|----------|----------|----------|-------------------|
-File       |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
------------|----------|----------|----------|----------|-------------------|
-All files  |    91.18 |    88.89 |        0 |    91.18 |                   |
- async.js  |      100 |      100 |      100 |      100 |                   |
- normal.js |    85.71 |       75 |        0 |    85.71 |          14,15,16 |
------------|----------|----------|----------|----------|-------------------|`)
+    output.toString('utf8').should.matchSnapshot()
   })
 
   it('merges reports from subprocesses together', () => {
@@ -33,22 +31,7 @@ All files  |    91.18 |    88.89 |        0 |    91.18 |                   |
       nodePath,
       require.resolve('./fixtures/multiple-spawn')
     ])
-    output.toString('utf8').should.include(`
---------------------|----------|----------|----------|----------|-------------------|
-File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
---------------------|----------|----------|----------|----------|-------------------|
-All files           |    94.12 |    70.59 |        0 |    94.12 |                   |
- bin                |    83.72 |    57.14 |      100 |    83.72 |                   |
-  c8.js             |    83.72 |    57.14 |      100 |    83.72 |... 22,40,41,42,43 |
- lib                |    96.41 |    65.38 |      100 |    96.41 |                   |
-  parse-args.js     |    97.47 |    44.44 |      100 |    97.47 |             55,56 |
-  report.js         |    95.45 |    76.47 |      100 |    95.45 |       51,52,53,54 |
- test/fixtures      |    95.16 |    83.33 |        0 |    95.16 |                   |
-  async.js          |      100 |      100 |      100 |      100 |                   |
-  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
-  normal.js         |    85.71 |       75 |        0 |    85.71 |          14,15,16 |
-  subprocess.js     |      100 |    71.43 |      100 |      100 |              9,13 |
---------------------|----------|----------|----------|----------|-------------------|`)
+    output.toString('utf8').should.matchSnapshot()
   })
 
   it('omit-relative can be set to false', () => {

test/integration.js.snap

@@ -0,0 +1,43 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`c8 merges reports from subprocesses together 1`] = `
+",first
+
+second
+
+--------------------|----------|----------|----------|----------|-------------------|
+File                |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
+--------------------|----------|----------|----------|----------|-------------------|
+All files           |    94.12 |    70.59 |        0 |    94.12 |                   |
+ bin                |    83.72 |    57.14 |      100 |    83.72 |                   |
+  c8.js             |    83.72 |    57.14 |      100 |    83.72 |... 22,40,41,42,43 |
+ lib                |    96.41 |    65.38 |      100 |    96.41 |                   |
+  parse-args.js     |    97.47 |    44.44 |      100 |    97.47 |             55,56 |
+  report.js         |    95.45 |    76.47 |      100 |    95.45 |       51,52,53,54 |
+ test/fixtures      |    95.16 |    83.33 |        0 |    95.16 |                   |
+  async.js          |      100 |      100 |      100 |      100 |                   |
+  multiple-spawn.js |      100 |      100 |      100 |      100 |                   |
+  normal.js         |    85.71 |       75 |        0 |    85.71 |          14,15,16 |
+  subprocess.js     |      100 |    71.43 |      100 |      100 |              9,13 |
+--------------------|----------|----------|----------|----------|-------------------|
+,"
+`;
+
+exports[`c8 reports coverage for script that exits normally 1`] = `
+",hey
+i am a line of code
+what
+hey
+what
+hey
+what
+hey
+-----------|----------|----------|----------|----------|-------------------|
+File       |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
+-----------|----------|----------|----------|----------|-------------------|
+All files  |    91.18 |    88.89 |        0 |    91.18 |                   |
+ async.js  |      100 |      100 |      100 |      100 |                   |
+ normal.js |    85.71 |       75 |        0 |    85.71 |          14,15,16 |
+-----------|----------|----------|----------|----------|-------------------|
+,"
+`;