diff --git a/src/Symfony/Component/Console/Helper/QuestionHelper.php b/src/Symfony/Component/Console/Helper/QuestionHelper.php
index d3188897f37c..17295adb3aec 100644
--- a/src/Symfony/Component/Console/Helper/QuestionHelper.php
+++ b/src/Symfony/Component/Console/Helper/QuestionHelper.php
@@ -166,7 +166,7 @@ private function doAsk(OutputInterface $output, Question $question)
             if (false === $ret) {
                 $ret = fgets($inputStream, 4096);
                 if (false === $ret) {
-                    throw new RuntimeException('Aborted');
+                    throw new RuntimeException('Aborted.');
                 }
                 $ret = trim($ret);
             }
@@ -252,8 +252,10 @@ private function autocomplete(OutputInterface $output, Question $question, $inpu
         while (!feof($inputStream)) {
             $c = fread($inputStream, 1);
 
-            // Backspace Character
-            if ("\177" === $c) {
+            // as opposed to fgets(), fread() returns an empty string when the stream content is empty, not false.
+            if (false === $c || ('' === $ret && '' === $c && null === $question->getDefault())) {
+                throw new RuntimeException('Aborted.');
+            } elseif ("\177" === $c) { // Backspace Character
                 if (0 === $numMatches && 0 !== $i) {
                     --$i;
                     // Move cursor backwards
@@ -380,7 +382,7 @@ private function getHiddenResponse(OutputInterface $output, $inputStream)
             shell_exec(sprintf('stty %s', $sttyMode));
 
             if (false === $value) {
-                throw new RuntimeException('Aborted');
+                throw new RuntimeException('Aborted.');
             }
 
             $value = trim($value);
diff --git a/src/Symfony/Component/Console/Tester/CommandTester.php b/src/Symfony/Component/Console/Tester/CommandTester.php
index 229471e13a35..f869995eb92d 100644
--- a/src/Symfony/Component/Console/Tester/CommandTester.php
+++ b/src/Symfony/Component/Console/Tester/CommandTester.php
@@ -62,9 +62,8 @@ public function execute(array $input, array $options = [])
         }
 
         $this->input = new ArrayInput($input);
-        if ($this->inputs) {
-            $this->input->setStream(self::createStream($this->inputs));
-        }
+        // Use an in-memory input stream even if no inputs are set so that QuestionHelper::ask() does not rely on the blocking STDIN.
+        $this->input->setStream(self::createStream($this->inputs));
 
         if (isset($options['interactive'])) {
             $this->input->setInteractive($options['interactive']);
diff --git a/src/Symfony/Component/Console/Tests/Helper/QuestionHelperTest.php b/src/Symfony/Component/Console/Tests/Helper/QuestionHelperTest.php
index 531474eddfe1..805b1311f572 100644
--- a/src/Symfony/Component/Console/Tests/Helper/QuestionHelperTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/QuestionHelperTest.php
@@ -900,7 +900,7 @@ public function testLegacyChoiceOutputFormattingQuestionForUtf8Keys()
 
     /**
      * @expectedException        \Symfony\Component\Console\Exception\RuntimeException
-     * @expectedExceptionMessage Aborted
+     * @expectedExceptionMessage Aborted.
      */
     public function testAskThrowsExceptionOnMissingInput()
     {
@@ -910,7 +910,17 @@ public function testAskThrowsExceptionOnMissingInput()
 
     /**
      * @expectedException        \Symfony\Component\Console\Exception\RuntimeException
-     * @expectedExceptionMessage Aborted
+     * @expectedExceptionMessage Aborted.
+     */
+    public function testAskThrowsExceptionOnMissingInputForChoiceQuestion()
+    {
+        $dialog = new QuestionHelper();
+        $dialog->ask($this->createStreamableInputInterfaceMock($this->getInputStream('')), $this->createOutputInterface(), new ChoiceQuestion('Choice', ['a', 'b']));
+    }
+
+    /**
+     * @expectedException        \Symfony\Component\Console\Exception\RuntimeException
+     * @expectedExceptionMessage Aborted.
      */
     public function testAskThrowsExceptionOnMissingInputWithValidator()
     {
diff --git a/src/Symfony/Component/Console/Tests/Helper/SymfonyQuestionHelperTest.php b/src/Symfony/Component/Console/Tests/Helper/SymfonyQuestionHelperTest.php
index e7fd806064d2..cf7a78c34ecd 100644
--- a/src/Symfony/Component/Console/Tests/Helper/SymfonyQuestionHelperTest.php
+++ b/src/Symfony/Component/Console/Tests/Helper/SymfonyQuestionHelperTest.php
@@ -124,7 +124,7 @@ public function testLabelTrailingBackslash()
 
     /**
      * @expectedException        \Symfony\Component\Console\Exception\RuntimeException
-     * @expectedExceptionMessage Aborted
+     * @expectedExceptionMessage Aborted.
      */
     public function testAskThrowsExceptionOnMissingInput()
     {
diff --git a/src/Symfony/Component/Console/Tests/Tester/CommandTesterTest.php b/src/Symfony/Component/Console/Tests/Tester/CommandTesterTest.php
index 8cad7f0385d0..f916b1821fcc 100644
--- a/src/Symfony/Component/Console/Tests/Tester/CommandTesterTest.php
+++ b/src/Symfony/Component/Console/Tests/Tester/CommandTesterTest.php
@@ -17,6 +17,7 @@
 use Symfony\Component\Console\Helper\HelperSet;
 use Symfony\Component\Console\Helper\QuestionHelper;
 use Symfony\Component\Console\Output\Output;
+use Symfony\Component\Console\Question\ChoiceQuestion;
 use Symfony\Component\Console\Question\Question;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\Console\Tester\CommandTester;
@@ -139,7 +140,7 @@ public function testCommandWithDefaultInputs()
 
     /**
      * @expectedException \RuntimeException
-     * @expectedMessage   Aborted
+     * @expectedExceptionMessage Aborted.
      */
     public function testCommandWithWrongInputsNumber()
     {
@@ -153,13 +154,40 @@ public function testCommandWithWrongInputsNumber()
         $command->setHelperSet(new HelperSet([new QuestionHelper()]));
         $command->setCode(function ($input, $output) use ($questions, $command) {
             $helper = $command->getHelper('question');
+            $helper->ask($input, $output, new ChoiceQuestion('choice', ['a', 'b']));
+            $helper->ask($input, $output, new Question($questions[0]));
+            $helper->ask($input, $output, new Question($questions[1]));
+            $helper->ask($input, $output, new Question($questions[2]));
+        });
+
+        $tester = new CommandTester($command);
+        $tester->setInputs(['a', 'Bobby', 'Fine']);
+        $tester->execute([]);
+    }
+
+    /**
+     * @expectedException \RuntimeException
+     * @expectedExceptionMessage Aborted.
+     */
+    public function testCommandWithQuestionsButNoInputs()
+    {
+        $questions = [
+            'What\'s your name?',
+            'How are you?',
+            'Where do you come from?',
+        ];
+
+        $command = new Command('foo');
+        $command->setHelperSet(new HelperSet([new QuestionHelper()]));
+        $command->setCode(function ($input, $output) use ($questions, $command) {
+            $helper = $command->getHelper('question');
+            $helper->ask($input, $output, new ChoiceQuestion('choice', ['a', 'b']));
             $helper->ask($input, $output, new Question($questions[0]));
             $helper->ask($input, $output, new Question($questions[1]));
             $helper->ask($input, $output, new Question($questions[2]));
         });
 
         $tester = new CommandTester($command);
-        $tester->setInputs(['Bobby', 'Fine']);
         $tester->execute([]);
     }