debugger: run last command on presssing enter

PR-URL: https://github.com/nodejs/node/pull/6090
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Claudio Rodriguez <cjrodr@yahoo.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Fixes: https://github.com/nodejs/node/issues/2895

2 files changed, 53 insertions, 0 deletions

diff --git a/test/fixtures/debugger-repeat-last.js b/test/fixtures/debugger-repeat-last.js
new file mode 100644
index 0000000000..86df8eebcb
--- /dev/null
+++ b/test/fixtures/debugger-repeat-last.js
@@ -0,0 +1,7 @@
+var a = 1;
+
+var b = 2;
+
+var c = 3;
+
+b = c;
diff --git a/test/parallel/test-debugger-repeat-last.js b/test/parallel/test-debugger-repeat-last.js
new file mode 100644
index 0000000000..7f0e1e6816
--- /dev/null
+++ b/test/parallel/test-debugger-repeat-last.js
@@ -0,0 +1,46 @@
+'use strict';
+const path = require('path');
+const spawn = require('child_process').spawn;
+const assert = require('assert');
+
+const common = require('../common');
+
+const fixture = path.join(
+  common.fixturesDir,
+  'debugger-repeat-last.js'
+);
+
+const args = [
+  'debug',
+  fixture
+];
+
+const proc = spawn(process.execPath, args, { stdio: 'pipe' });
+proc.stdout.setEncoding('utf8');
+
+var stdout = '';
+
+var sentCommand = false;
+var sentEmpty = false;
+var sentExit = false;
+
+proc.stdout.on('data', (data) => {
+  stdout += data;
+  if (!sentCommand && stdout.includes('> 1')) {
+    setImmediate(() => {proc.stdin.write('n\n');});
+    return sentCommand = true;
+  }
+  if (!sentEmpty && stdout.includes('> 3')) {
+    setImmediate(() => {proc.stdin.write('\n');});
+    return sentEmpty = true;
+  }
+  if (!sentExit && sentCommand && sentEmpty) {
+    setTimeout(() => {proc.stdin.write('\n\n\n.exit\n\n\n');}, 1);
+    return sentExit = true;
+  }
+});
+
+process.on('exit', (exitCode) => {
+  assert.strictEqual(exitCode, 0);
+  console.log(stdout);
+});