clone so user doesnt get attached to the facade singleton

src/Git/Git.php

@@ -57,11 +57,16 @@ public function statuses()
         return $statuses->isNotEmpty() ? $statuses : null;
     }
 
-    public function as($user)
+    /**
+     * Act as a specific user.
+     */
+    public function as(?UserContract $user): static
     {
-        $this->authenticatedUser = $user;
+        $clone = clone $this;
+
+        $clone->authenticatedUser = $user;
 
-        return $this;
+        return $clone;
     }
 
     /**

tests/Git/GitTest.php

@@ -186,10 +186,10 @@ public function it_gets_git_user_info()
             ->data(['name' => 'Han Solo'])
             ->makeSuper();
 
-        Git::as($han);
-
-        $this->assertEquals('Han Solo', Git::gitUserName());
-        $this->assertEquals('han@solo.com', Git::gitUserEmail());
+        $this->assertEquals('Han Solo', Git::as($han)->gitUserName());
+        $this->assertEquals('[email protected]', Git::as($han)->gitUserEmail());
+        $this->assertEquals('Chewy', Git::gitUserName());
+        $this->assertEquals('chew@bacca.com', Git::gitUserEmail());
 
         Config::set('statamic.git.use_authenticated', false);