diff --git a/src/ComponentInstaller.php b/src/ComponentInstaller.php
index b1b833f..9c43da2 100644
--- a/src/ComponentInstaller.php
+++ b/src/ComponentInstaller.php
@@ -18,7 +18,6 @@
 use Zend\ComponentInstaller\Injector\AbstractInjector;
 use Zend\ComponentInstaller\Injector\ConfigInjectorChain;
 use Zend\ComponentInstaller\Injector\InjectorInterface;
-use Zend\ComponentInstaller\Injector\NoopInjector;
 
 /**
  * If a package represents a component module, update the application configuration.
@@ -449,7 +448,7 @@ private function promptForConfigOption(
         $ask[] = sprintf('  Make your selection (default is <comment>%d</comment>):', $default);
 
         while (true) {
-            $answer = $this->io->ask($ask, $default);
+            $answer = $this->io->ask(implode($ask), $default);
 
             if (is_numeric($answer) && isset($options[(int) $answer])) {
                 $injector = $options[(int) $answer]->getInjector();
@@ -474,7 +473,7 @@ private function promptToRememberOption(Injector\InjectorInterface $injector, $p
         $ask = ["\n  <question>Remember this option for other packages of the same type? (Y/n)</question>"];
 
         while (true) {
-            $answer = strtolower($this->io->ask($ask, 'y'));
+            $answer = strtolower($this->io->ask(implode($ask), 'y'));
 
             switch ($answer) {
                 case 'y':
diff --git a/test/ComponentInstallerTest.php b/test/ComponentInstallerTest.php
index 8e6f451..59a04a7 100644
--- a/test/ComponentInstallerTest.php
+++ b/test/ComponentInstallerTest.php
@@ -16,7 +16,6 @@
 use Composer\Package\RootPackageInterface;
 use org\bovigo\vfs\vfsStream;
 use org\bovigo\vfs\vfsStreamDirectory;
-use org\bovigo\vfs\vfsStreamWrapper;
 use PHPUnit\Framework\TestCase;
 use Prophecy\Argument;
 use Prophecy\Prophecy\ObjectProphecy;
@@ -76,6 +75,38 @@ public function setUp()
         $this->composer->getInstallationManager()->willReturn($this->installationManager->reveal());
     }
 
+    public static function assertPrompt($argument, $packageName = null)
+    {
+        if (! is_string($argument)) {
+            return false;
+        }
+
+        if (false !== strpos($argument, 'Remember this option for other packages of the same type?')) {
+            return true;
+        }
+
+        if (! $packageName) {
+            return false;
+        }
+
+        if (false === strpos(
+                $argument,
+                sprintf("Please select which config file you wish to inject '%s' into", $packageName)
+            )) {
+            return false;
+        }
+
+        if (false === strpos($argument, 'Do not inject')) {
+            return false;
+        }
+
+        if (false === strpos($argument, 'application.config.php')) {
+            return false;
+        }
+
+        return true;
+    }
+
     public function createApplicationConfig($contents = null)
     {
         $contents = $contents ?: '<' . "?php\nreturn [\n    'modules' => [\n    ]\n];";
@@ -141,37 +172,11 @@ public function getModuleDependencies()
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
-                return false;
-            }
-
-            if (false === strpos(
-                $argument[0],
-                "Please select which config file you wish to inject 'SomeComponent' into"
-            )) {
-                return false;
-            }
-
-            if (false === strpos($argument[1], 'Do not inject')) {
-                return false;
-            }
-
-            if (false === strpos($argument[2], 'application.config.php')) {
-                return false;
-            }
-
-            return true;
+            return ComponentInstallerTest::assertPrompt($argument, 'SomeComponent');
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
-                return false;
-            }
-            if (false === strpos($argument[0], 'Remember')) {
-                return false;
-            }
-
-            return true;
+            return ComponentInstallerTest::assertPrompt($argument);
         }), 'y')->willReturn('y');
 
         $this->io->write(Argument::that(function ($argument) {
@@ -515,37 +520,11 @@ public function getModuleDependencies()
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) use ($packageName) {
-            if (! is_array($argument)) {
-                return false;
-            }
-
-            if (false === strpos(
-                $argument[0],
-                sprintf("Please select which config file you wish to inject '%s' into", $packageName)
-            )) {
-                return false;
-            }
-
-            if (false === strpos($argument[1], 'Do not inject')) {
-                return false;
-            }
-
-            if (false === strpos($argument[2], 'application.config.php')) {
-                return false;
-            }
-
-            return true;
+            return ComponentInstallerTest::assertPrompt($argument, $packageName);
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
-                return false;
-            }
-            if (false === strpos($argument[0], 'Remember')) {
-                return false;
-            }
-
-            return true;
+            return ComponentInstallerTest::assertPrompt($argument);
         }), 'y')->willReturn('y');
 
         $this->io->write(Argument::that(function ($argument) use ($packageName) {
@@ -637,37 +616,11 @@ public function testModuleBeforeApplicationModules(array $availableModules, arra
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
-                return false;
-            }
-
-            if (false === strpos(
-                $argument[0],
-                "Please select which config file you wish to inject 'SomeModule' into"
-            )) {
-                return false;
-            }
-
-            if (false === strpos($argument[1], 'Do not inject')) {
-                return false;
-            }
-
-            if (false === strpos($argument[2], 'application.config.php')) {
-                return false;
-            }
-
-            return true;
+            return ComponentInstallerTest::assertPrompt($argument, 'SomeModule');
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
-                return false;
-            }
-            if (false === strpos($argument[0], 'Remember')) {
-                return false;
-            }
-
-            return true;
+            return ComponentInstallerTest::assertPrompt($argument);
         }), 'y')->willReturn('y');
 
         $this->io->write(Argument::that(function ($argument) {
@@ -827,22 +780,22 @@ public function testOnPostPackageInstallPromptsForConfigOptions()
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Some\Component' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -850,10 +803,10 @@ public function testOnPostPackageInstallPromptsForConfigOptions()
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
-            if (false === strpos($argument[0], 'Remember')) {
+            if (false === strpos($argument, 'Remember')) {
                 return false;
             }
 
@@ -891,22 +844,22 @@ public function testOnPostPackageInstallPromptsForConfigOptionsWhenDefinedAsArra
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Some\Component' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -914,22 +867,22 @@ public function testOnPostPackageInstallPromptsForConfigOptionsWhenDefinedAsArra
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Other\Component' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -938,10 +891,10 @@ public function testOnPostPackageInstallPromptsForConfigOptionsWhenDefinedAsArra
 
         $io = $this->io;
         $askValidator = function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                     return false;
             }
-            if (false === strpos($argument[0], 'Remember')) {
+            if (false === strpos($argument, 'Remember')) {
                 return false;
             }
 
@@ -990,22 +943,22 @@ public function testMultipleInvocationsOfOnPostPackageInstallCanPromptMultipleTi
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Some\Component' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -1013,10 +966,10 @@ public function testMultipleInvocationsOfOnPostPackageInstallCanPromptMultipleTi
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
-            if (false === strpos($argument[0], 'Remember')) {
+            if (false === strpos($argument, 'Remember')) {
                 return false;
             }
 
@@ -1047,22 +1000,22 @@ public function testMultipleInvocationsOfOnPostPackageInstallCanPromptMultipleTi
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Other\Component' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -1070,10 +1023,10 @@ public function testMultipleInvocationsOfOnPostPackageInstallCanPromptMultipleTi
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
-            if (false === strpos($argument[0], 'Remember')) {
+            if (false === strpos($argument, 'Remember')) {
                 return false;
             }
 
@@ -1109,22 +1062,22 @@ public function testMultipleInvocationsOfOnPostPackageInstallCanReuseOptions()
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Some\Component' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -1132,10 +1085,10 @@ public function testMultipleInvocationsOfOnPostPackageInstallCanReuseOptions()
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
-            if (false === strpos($argument[0], 'Remember')) {
+            if (false === strpos($argument, 'Remember')) {
                 return false;
             }
 
@@ -1298,22 +1251,22 @@ public function testModuleIsAppended()
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Some\Module' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -1321,10 +1274,10 @@ public function testModuleIsAppended()
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
-            if (false === strpos($argument[0], 'Remember')) {
+            if (false === strpos($argument, 'Remember')) {
                 return false;
             }
 
@@ -1366,22 +1319,22 @@ public function testAppendModuleAndPrependComponent()
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Some\Module' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -1389,22 +1342,22 @@ public function testAppendModuleAndPrependComponent()
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Some\Component' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -1412,10 +1365,10 @@ public function testAppendModuleAndPrependComponent()
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
-            if (false === strpos($argument[0], 'Remember')) {
+            if (false === strpos($argument, 'Remember')) {
                 return false;
             }
 
@@ -1462,22 +1415,22 @@ public function testPrependComponentAndAppendModule()
         $event->getOperation()->willReturn($operation->reveal());
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Some\Module' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -1485,22 +1438,22 @@ public function testPrependComponentAndAppendModule()
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
 
             if (false === strpos(
-                $argument[0],
+                $argument,
                 "Please select which config file you wish to inject 'Some\Component' into"
             )) {
                 return false;
             }
 
-            if (false === strpos($argument[1], 'Do not inject')) {
+            if (false === strpos($argument, 'Do not inject')) {
                 return false;
             }
 
-            if (false === strpos($argument[2], 'application.config.php')) {
+            if (false === strpos($argument, 'application.config.php')) {
                 return false;
             }
 
@@ -1508,10 +1461,10 @@ public function testPrependComponentAndAppendModule()
         }), 1)->willReturn(1);
 
         $this->io->ask(Argument::that(function ($argument) {
-            if (! is_array($argument)) {
+            if (! is_string($argument)) {
                 return false;
             }
-            if (false === strpos($argument[0], 'Remember')) {
+            if (false === strpos($argument, 'Remember')) {
                 return false;
             }