Fixing "composer require orm orm" bug

Author: weaverryan

src/DependencyBuilder.php

@@ -113,7 +113,7 @@ private function getRequiredDependencyNames(array $dependencies)
             $packages[] = $package['name'];
         }
 
-        return $packages;
+        return array_unique($packages);
     }
 
     private function calculateMissingDependencies(array $dependencies)
@@ -134,6 +134,6 @@ private function calculateMissingDependencies(array $dependencies)
             return [];
         }
 
-        return array_merge($missingPackages, $missingOptionalPackages);
+        return array_unique(array_merge($missingPackages, $missingOptionalPackages));
     }
 }

tests/DependencyBuilderTest.php

@@ -14,6 +14,7 @@ public function testGetAllRequiredDependencies()
         $depBuilder->addClassDependency('Bar', 'bar-package');
         $depBuilder->addClassDependency('DevStuff', 'dev-stuff-package', true, true);
         $depBuilder->addClassDependency('DevStuff2', 'dev-stuff2-package', true, true);
+        $depBuilder->addClassDependency('DevStuff3', 'dev-stuff2-package', true, true);
 
         $this->assertSame(['foo-package', 'bar-package'], $depBuilder->getAllRequiredDependencies());
         $this->assertSame(['dev-stuff-package', 'dev-stuff2-package'], $depBuilder->getAllRequiredDevDependencies());