chore: Add failing test for --all on pre-instrumented code

tap-snapshots/test-instrument.js-TAP.test.js

@@ -0,0 +1,17 @@
+/* IMPORTANT
+ * This snapshot file is auto-generated, but designed for humans.
+ * It should be checked into source control and tracked carefully.
+ * Re-generate by setting TAP_SNAPSHOT=1 and running tests.
+ * Make sure to inspect the output below.  Do not ignore changes!
+ */
+'use strict'
+exports[`test/instrument.js TAP can write files in place with --in-place switch > stdout 1`] = `
+----------|---------|----------|---------|---------|-------------------
+File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
+----------|---------|----------|---------|---------|-------------------
+All files |       0 |      100 |       0 |       0 |                   
+ file1.js |       0 |      100 |       0 |       0 | 2,5               
+ file2.js |       0 |      100 |       0 |       0 | 2,5               
+----------|---------|----------|---------|---------|-------------------
+
+`

test/instrument.js

@@ -10,7 +10,7 @@ const cpFile = require('cp-file')
 const isWindows = require('is-windows')()
 const rimraf = promisify(require('rimraf'))
 
-const { runNYC, fixturesCLI } = require('./helpers')
+const { runNYC, testSuccess, fixturesCLI } = require('./helpers')
 
 const subdir = path.resolve(fixturesCLI, 'subdir')
 const outputDir = path.resolve(subdir, './output-dir')
@@ -264,6 +264,11 @@ t.test('can write files in place with --in-place switch', async t => {
 
   const file2 = path.resolve(outputDir, 'file2.js')
   t.notMatch(await fs.readFile(file2, 'utf8'), /function cov_/)
+
+  await testSuccess(t, {
+    args: ['--all', process.execPath, '-e', ''],
+    cwd: outputDir
+  })
 })
 
 t.test('aborts if trying to delete while writing files in place', async t => {