diff --git a/.travis.yml b/.travis.yml
index e0dd3008..3ea48a4b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,6 +13,7 @@ matrix:
 
 script:
   - if [ "$flavour" = "latest" ]; then make build; else make build-alpine; fi
+  - docker run -it --rm jakzal/phpqa:$flavour php /usr/local/bin/tools.php test
   - docker run -it --rm jakzal/phpqa:$flavour
 
 after_script:
diff --git a/tools.json b/tools.json
index 661c715d..396f4cd6 100644
--- a/tools.json
+++ b/tools.json
@@ -8,7 +8,8 @@
         "composer-install": {
           "repository": "https://github.com/Qafoo/QualityAnalyzer.git"
         }
-      }
+      },
+      "test": "analyze list"
     },
     {
       "name": "churn",
@@ -18,7 +19,8 @@
         "composer-global-install": {
           "package": "bmitch/churn-php"
         }
-      }
+      },
+      "test": "churn list"
     },
     {
       "name": "dephpend",
@@ -29,7 +31,8 @@
           "phar": "https://phar.dephpend.com/dephpend.phar",
           "bin": "/usr/local/bin/dephpend"
         }
-      }
+      },
+      "test": "dephpend list"
     },
     {
       "name": "deprecation-detector",
@@ -40,7 +43,8 @@
           "phar": "https://github.com/sensiolabs-de/deprecation-detector/releases/download/0.1.0-alpha4/deprecation-detector.phar",
           "bin": "/usr/local/bin/deprecation-detector"
         }
-      }
+      },
+      "test": "deprecation-detector list"
     },
     {
       "name": "deptrac",
@@ -51,7 +55,8 @@
           "phar": "http://get.sensiolabs.de/deptrac.phar",
           "bin": "/usr/local/bin/deptrac"
         }
-      }
+      },
+      "test": "deptrac list"
     },
     {
       "name": "design-pattern",
@@ -61,7 +66,8 @@
         "composer-install": {
           "repository": "https://github.com/Halleck45/DesignPatternDetector.git"
         }
-      }
+      },
+      "test": "design-pattern -V"
     },
     {
       "name": "parallel-lint",
@@ -73,7 +79,8 @@
           "phar": "parallel-lint.phar",
           "bin": "/usr/local/bin/parallel-lint"
         }
-      }
+      },
+      "test": "parallel-lint -h"
     },
     {
       "name": "pdepend",
@@ -84,7 +91,8 @@
           "phar": "http://static.pdepend.org/php/latest/pdepend.phar",
           "bin": "/usr/local/bin/pdepend"
         }
-      }
+      },
+      "test": "pdepend --version"
     },
     {
       "name": "phan",
@@ -95,7 +103,8 @@
           "phar": "https://github.com/etsy/phan/releases/download/0.10.0/phan.phar",
           "bin": "/usr/local/bin/phan"
         }
-      }
+      },
+      "test": "phan -v"
     },
     {
       "name": "php-coupling-detector",
@@ -105,7 +114,8 @@
         "composer-global-install": {
           "package": "akeneo/php-coupling-detector"
         }
-      }
+      },
+      "test": "php-coupling-detector list"
     },
     {
       "name": "php-cs-fixer",
@@ -116,7 +126,8 @@
           "phar": "http://cs.sensiolabs.org/download/php-cs-fixer-v2.phar",
           "bin": "/usr/local/bin/php-cs-fixer"
         }
-      }
+      },
+      "test": "php-cs-fixer list"
     },
     {
       "name": "php-formatter",
@@ -128,7 +139,8 @@
           "phar": "build/php-formatter.phar",
           "bin": "/usr/local/bin/php-formatter"
         }
-      }
+      },
+      "test": "php-formatter list"
     },
     {
       "name": "php-semver-checker",
@@ -139,7 +151,8 @@
           "phar": "http://psvc.coreteks.org/php-semver-checker.phar",
           "bin": "/usr/local/bin/php-semver-checker"
         }
-      }
+      },
+      "test": "php-semver-checker list"
     },
     {
       "name": "phpDocumentor",
@@ -150,7 +163,8 @@
           "phar": "http://phpdoc.org/phpDocumentor.phar",
           "bin": "/usr/local/bin/phpDocumentor"
         }
-      }
+      },
+      "test": "phpDocumentor list"
     },
     {
       "name": "phpa",
@@ -160,7 +174,8 @@
         "composer-global-install": {
           "package": "rskuipers/php-assumptions:dev-master"
         }
-      }
+      },
+      "test": "phpa"
     },
     {
       "name": "phpca",
@@ -170,7 +185,8 @@
         "composer-global-install": {
           "package": "wapmorgan/php-code-analyzer"
         }
-      }
+      },
+      "test": "phpca -h"
     },
     {
       "name": "phpcb",
@@ -181,7 +197,8 @@
           "phar": "https://github.com/bytepark/php-phar-qatools/raw/master/phpcb.phar",
           "bin": "/usr/local/bin/phpcb"
         }
-      }
+      },
+      "test": "phpcb -V"
     },
     {
       "name": "phpcbf",
@@ -192,7 +209,8 @@
           "phar": "https://squizlabs.github.io/PHP_CodeSniffer/phpcbf.phar",
           "bin": "/usr/local/bin/phpcbf"
         }
-      }
+      },
+      "test": "phpcbf --help"
     },
     {
       "name": "phpcf",
@@ -202,7 +220,8 @@
         "composer-global-install": {
           "package": "wapmorgan/php-code-fixer"
         }
-      }
+      },
+      "test": "phpcf -h"
     },
     {
       "name": "phpcpd",
@@ -213,7 +232,8 @@
           "phar": "https://phar.phpunit.de/phpcpd.phar",
           "bin": "/usr/local/bin/phpcpd"
         }
-      }
+      },
+      "test": "phpcpd -V"
     },
     {
       "name": "phpcs",
@@ -224,7 +244,8 @@
           "phar": "https://squizlabs.github.io/PHP_CodeSniffer/phpcs.phar",
           "bin": "/usr/local/bin/phpcs"
         }
-      }
+      },
+      "test": "phpcs --help"
     },
     {
       "name": "phpda",
@@ -239,7 +260,8 @@
           "phar": "https://raw.github.com/mamuz/PhpDependencyAnalysis/master/download/phpda",
           "bin": "/usr/local/bin/phpda"
         }
-      }
+      },
+      "test": "phpda list"
     },
     {
       "name": "phpdoc-to-typehint",
@@ -250,7 +272,8 @@
           "phar": "https://github.com/dunglas/phpdoc-to-typehint/releases/download/v0.1.0/phpdoc-to-typehint.phar",
           "bin": "/usr/local/bin/phpdoc-to-typehint"
         }
-      }
+      },
+      "test": "phpdoc-to-typehint -V"
     },
     {
       "name": "phploc",
@@ -261,7 +284,8 @@
           "phar": "https://phar.phpunit.de/phploc.phar",
           "bin": "/usr/local/bin/phploc"
         }
-      }
+      },
+      "test": "phploc -V"
     },
     {
       "name": "phpmd",
@@ -272,7 +296,8 @@
           "phar": "http://static.phpmd.org/php/latest/phpmd.phar",
           "bin": "/usr/local/bin/phpmd"
         }
-      }
+      },
+      "test": "phpmd /usr/local/bin/tools.php text unusedcode"
     },
     {
       "name": "phpmetrics",
@@ -283,7 +308,8 @@
           "phar": "https://github.com/phpmetrics/PhpMetrics/releases/download/v2.3.0/phpmetrics.phar",
           "bin": "/usr/local/bin/phpmetrics"
         }
-      }
+      },
+      "test": "phpmetrics --version"
     },
     {
       "name": "phpmnd",
@@ -293,7 +319,8 @@
         "composer-global-install": {
           "package": "povils/phpmnd"
         }
-      }
+      },
+      "test": "phpmnd -V"
     },
     {
       "name": "phpstan",
@@ -301,10 +328,11 @@
       "website": "https://github.com/phpstan/phpstan",
       "command": {
         "phar-download": {
-          "phar": "https://github.com/phpstan/phpstan/releases/download/0.8.5/phpstan.phar",
+          "phar": "https://github.com/phpstan/phpstan/releases/download/0.8.4/phpstan.phar",
           "bin": "/usr/local/bin/phpstan"
         }
-      }
+      },
+      "test": "phpstan list"
     },
     {
       "name": "psalm",
@@ -314,7 +342,8 @@
         "composer-global-install": {
           "package": "vimeo/psalm"
         }
-      }
+      },
+      "test": "psalm -h"
     },
     {
       "name": "security-checker",
@@ -325,7 +354,8 @@
           "phar": "http://get.sensiolabs.org/security-checker.phar",
           "bin": "/usr/local/bin/security-checker"
         }
-      }
+      },
+      "test": "security-checker"
     },
     {
       "name": "testability",
@@ -335,7 +365,8 @@
         "composer-global-install": {
           "package": "edsonmedina/php_testability:dev-master"
         }
-      }
+      },
+      "test": "testability --help"
     }
   ]
 }
diff --git a/tools.php b/tools.php
index 4b371b49..cc65fca6 100644
--- a/tools.php
+++ b/tools.php
@@ -8,20 +8,22 @@ final class Tool
         private $summary;
         private $website;
         private $command;
+        private $testCommand;
 
-        public function __construct(string $name, string $summary, string $website, Command $command)
+        public function __construct(string $name, string $summary, string $website, Command $command, Command $testCommand)
         {
             $this->name = $name;
             $this->summary = $summary;
             $this->website = $website;
             $this->command = $command;
+            $this->testCommand = $testCommand;
         }
 
         public static function import(array $tool): self
         {
-            \Assert\requireFields(['name', 'summary', 'website', 'command'], $tool, 'tool');
+            \Assert\requireFields(['name', 'summary', 'website', 'command', 'test'], $tool, 'tool');
 
-            return new self($tool['name'], $tool['summary'], $tool['website'], self::importCommand($tool));
+            return new self($tool['name'], $tool['summary'], $tool['website'], self::importCommand($tool), new TestCommand($tool['test'], $tool['name']));
         }
 
         private static function importCommand(array $tool): Command
@@ -84,6 +86,11 @@ public function command(): Command
         {
             return $this->command;
         }
+
+        public function testCommand(): Command
+        {
+            return $this->testCommand;
+        }
     }
 
     interface Command
@@ -292,6 +299,23 @@ public function __toString(): string
             return $this->command;
         }
     }
+
+    final class TestCommand implements Command
+    {
+        private $command;
+        private $name;
+
+        public function __construct(string $command, string $name)
+        {
+            $this->command = $command;
+            $this->name = $name;
+        }
+
+        public function __toString(): string
+        {
+            return sprintf('((%s > /dev/null && echo -e "\e[0;32m✔\e[0m︎%s") || (echo -e "\e[1;31m✘\e[0m%s" && false))', $this->command, $this->name, $this->name);
+        }
+    }
 }
 
 namespace Assert {
@@ -422,6 +446,7 @@ function PleaseTry(callable $f): PleaseTry
     use F\PleaseTry;
     use F\Success;
     use Model\ShCommand;
+    use Model\TestCommand;
     use Model\Tool;
 
     function LoadFile(string $source): string
@@ -449,10 +474,20 @@ function ParseJson(string $source): array
     function LoadTools(string $source): PleaseTry
     {
         $defaultTools = [
-            new Tool('composer', 'Dependency Manager for PHP', 'https://getcomposer.org/',
-                new ShCommand('curl -Ls https://getcomposer.org/composer.phar > /usr/local/bin/composer && chmod +x /usr/local/bin/composer')),
-            new Tool('box', 'An application for building and managing Phars', 'https://box-project.github.io/box2/',
-                new ShCommand('curl -Ls https://box-project.github.io/box2/installer.php | php && mv box.phar /usr/local/bin/box && chmod +x /usr/local/bin/box')),
+            new Tool(
+                'composer',
+                'Dependency Manager for PHP',
+                'https://getcomposer.org/',
+                new ShCommand('curl -Ls https://getcomposer.org/composer.phar > /usr/local/bin/composer && chmod +x /usr/local/bin/composer'),
+                new TestCommand('composer list', 'composer')
+            ),
+            new Tool(
+                'box',
+                'An application for building and managing Phars',
+                'https://box-project.github.io/box2/',
+                new ShCommand('curl -Ls https://box-project.github.io/box2/installer.php | php && mv box.phar /usr/local/bin/box && chmod +x /usr/local/bin/box'),
+                new TestCommand('box list', 'box')
+            ),
         ];
 
         return
@@ -504,6 +539,23 @@ function InstallCommand(PleaseTry $tools): Command
     }
 }
 
+namespace Test {
+
+    use F\PleaseTry;
+    use Model\Command;
+    use Model\MultiStepCommand;
+    use Model\Tool;
+
+    function TestCommand(PleaseTry $tools): Command
+    {
+        $commands = $tools->map(function (Tool $tool) {
+            return $tool->testCommand();
+        });
+
+        return new MultiStepCommand($commands->get(), ' && ');
+    }
+}
+
 namespace DocUpdate {
 
     use F\PleaseTry;
@@ -522,11 +574,26 @@ function UpdateReadme(PleaseTry $tools, string $filePath)
     }
 }
 
+namespace Runner {
+
+    use Model\Command;
+
+    function Run(Command $command): int {
+        $status = 1;
+
+        passthru((string) $command, $status);
+
+        return $status;
+    }
+}
+
 namespace {
 
     use function Installation\InstallCommand;
     use function JsonLoader\LoadTools;
     use function DocUpdate\UpdateReadme;
+    use function Runner\Run;
+    use function Test\TestCommand;
 
     $jsonPath = !empty(getenv('TOOLS_JSON')) ? getenv('TOOLS_JSON') : __DIR__ . '/tools.json';
     $action = $argv[1] ?? 'list';
@@ -534,7 +601,11 @@ function UpdateReadme(PleaseTry $tools, string $filePath)
 
     switch ($action) {
         case 'install':
-            passthru((string) InstallCommand($tools));
+            exit(Run(InstallCommand($tools)));
+
+            break;
+        case 'test':
+            exit(Run(TestCommand($tools)));
 
             break;
         case 'update-readme':
@@ -544,12 +615,14 @@ function UpdateReadme(PleaseTry $tools, string $filePath)
 
             break;
         case 'list':
-        default:
             print('Available tools:' . PHP_EOL);
             foreach ($tools->get() as $tool) {
                 printf('* %s - %s - %s' . PHP_EOL, $tool->name(), $tool->summary(), $tool->website());
             }
 
             break;
+        default:
+            printf('Unrecognised command: "%s".', $action);
+            exit(1);
     }
 }