Assert that failures are not success codes

src/Illuminate/Testing/PendingCommand.php

@@ -52,6 +52,13 @@ class PendingCommand
      */
     protected $expectedExitCode;
 
+    /**
+     * The not expected exit code.
+     *
+     * @var int
+     */
+    protected $notExpectedExitCode;
+
     /**
      * Determine if the command has executed.
      *
@@ -193,6 +200,19 @@ public function assertExitCode($exitCode)
         return $this;
     }
 
+    /**
+     * Assert that the command does not have the given exit code.
+     *
+     * @param  int  $exitCode
+     * @return $this
+     */
+    public function assertNotExitCode($exitCode)
+    {
+        $this->notExpectedExitCode = $exitCode;
+
+        return $this;
+    }
+
     /**
      * Assert that the command has the success exit code.
      *
@@ -210,7 +230,7 @@ public function assertSuccessful()
      */
     public function assertFailed()
     {
-        return $this->assertExitCode(Command::FAILURE);
+        return $this->assertNotExitCode(Command::SUCCESS);
     }
 
     /**
@@ -251,6 +271,11 @@ public function run()
                 $this->expectedExitCode, $exitCode,
                 "Expected status code {$this->expectedExitCode} but received {$exitCode}."
             );
+        } else if ($this->notExpectedExitCode !== null) {
+            $this->test->assertNotEquals(
+                $this->notExpectedExitCode, $exitCode,
+                "Not expected status code {$this->notExpectedExitCode} was received."
+            );
         }
 
         $this->verifyExpectations();