feat(exec): add alias stubExecOnce, close #6

Author: bahmutov

README.md

@@ -131,6 +131,13 @@ cp.exec('echo "hello"', (code, out, errors) => {
 })
 ```
 
+You can use alias `stubExecOnce` to `stubSpawnOnce`
+
+```js
+const {stubExecOnce} = require('stub-spawn-once')
+stubExecOnce('echo "hi"', "bye")
+```
+
 [execFile]: https://nodejs.org/api/child_process.html#child_process_child_process_execfile_file_args_options_callback
 
 ### Small print

src/index.js

@@ -129,4 +129,9 @@ function stubSpawnShellOnce (command, exitCode, stdout, stderr) {
   }
 }
 
-module.exports = { stubSpawnOnce, stubSpawnShellOnce }
+module.exports = {
+  stubSpawnOnce,
+  stubSpawnShellOnce,
+  stubExecOnce: stubSpawnOnce,
+  stubExecFileOnce: stubSpawnOnce
+}

src/stub-spawn-once-spec.js

@@ -48,6 +48,37 @@ describe('stub-spawn-once', () => {
     })
   })
 
+  describe('stubExecOnce', () => {
+    const { stubExecOnce } = require('..')
+
+    it('is a function', () => {
+      la(is.fn(stubExecOnce))
+    })
+
+    it('stubs cp.exec', done => {
+      const cmd = 'does not exist'
+      stubExecOnce(cmd, 0, 'foo')
+      cp.exec(cmd, (code, stdout) => {
+        la(code === 0, 'wrong code', code)
+        la(stdout === 'foo', 'wrong stdout', stdout)
+        done()
+      })
+    })
+
+    it('restores cp.exec after that', done => {
+      const cmd = 'does not exist'
+      stubExecOnce(cmd, 0, 'foo')
+      cp.exec(cmd, (code, stdout) => {
+        la(code === 0, 'wrong code', code)
+        la(stdout === 'foo', 'wrong stdout', stdout)
+        cp.exec(cmd, (err, out) => {
+          la(is.error(err), 'hmm, command succeeded', err, out)
+          done()
+        })
+      })
+    })
+  })
+
   describe('stubSpawnOnce', () => {
     it('is a function', () => {
       la(is.fn(stubSpawnOnce))