Fix PerforceDownloader, fixes #7979

src/Composer/Downloader/PerforceDownloader.php

@@ -78,7 +78,7 @@ class PerforceDownloader extends VcsDownloader
      */
     public function doUpdate(PackageInterface $initial, PackageInterface $target, $path, $url)
     {
-        $this->doDownload($target, $path, $url);
+        $this->doInstall($target, $path, $url);
     }
 
     /**

tests/Composer/Test/Downloader/PerforceDownloaderTest.php

@@ -121,7 +121,7 @@ class PerforceDownloaderTest extends TestCase
      * @depends testInitPerforceInstantiatesANewPerforceObject
      * @depends testInitPerforceDoesNothingIfPerforceAlreadySet
      */
-    public function testDoDownloadWithTag()
+    public function testDoInstallWithTag()
     {
         //I really don't like this test but the logic of each Perforce method is tested in the Perforce class.  Really I am just enforcing workflow.
         $ref = 'SOURCE_REF@123';
@@ -145,7 +145,7 @@ class PerforceDownloaderTest extends TestCase
      * @depends testInitPerforceInstantiatesANewPerforceObject
      * @depends testInitPerforceDoesNothingIfPerforceAlreadySet
      */
-    public function testDoDownloadWithNoTag()
+    public function testDoInstallWithNoTag()
     {
         $ref = 'SOURCE_REF';
         $label = null;