fix: do not lose code 0 when filtering, close #4

package.json

@@ -77,6 +77,7 @@
     "dont-crack": "1.2.1",
     "git-issues": "1.3.1",
     "github-post-release": "1.13.1",
+    "lazy-ass": "1.6.0",
     "license-checker": "15.0.0",
     "mocha": "4.0.1",
     "nsp": "2.7.0",

src/execa-wrap-spec.js

@@ -4,13 +4,20 @@
 const execaWrap = require('.')
 const snapshot = require('snap-shot-it')
 const os = require('os')
+const la = require('lazy-ass')
 
 if (os.platform() !== 'win32') {
   describe('execa-wrap', () => {
     it('ls', () => {
       return execaWrap('ls', ['src']).then(snapshot.bind(null, 'ls src'))
     })
 
+    it('filtering code 0', () => {
+      return execaWrap('ls', ['src'], { filter: 'code' }).then(output => {
+        la(output.indexOf('code: 0') !== -1, output)
+      })
+    })
+
     it('failing', () => {
       return execaWrap('boo', ['src']).then(snapshot.bind(null, 'boo src'))
     })

src/index.js

@@ -15,28 +15,28 @@ const makeFilteredText = result => {
 
   // indent with 2 spaces every line
   let message = ''
-  if (result.cmd) {
+  if ('cmd' in result) {
     message += `  command: ${result.cmd}\n`
   }
-  if (result.code) {
+  if ('code' in result) {
     message += `  code: ${result.code}\n`
   }
-  if (result.failed) {
+  if ('failed' in result) {
     message += `  failed: ${result.failed}\n`
   }
-  if (result.killed) {
+  if ('killed' in result) {
     message += `  killed: ${result.killed}\n`
   }
-  if (result.signal) {
+  if ('signal' in result) {
     message += `  signal: ${result.signal}\n`
   }
-  if (result.stdout) {
+  if ('stdout' in result) {
     message += `  stdout:
   -------
   ${result.stdout}
   -------\n`
   }
-  if (result.stderr) {
+  if ('stderr' in result) {
     message += `  stderr:
   -------
   ${result.stderr}