Merge pull request #7781 from rubygems/deivid-rodriguez/add-regression-test-for-bundle-update-bundler-fix

Add a regression test for previous `bundler update --bundler` fix

(cherry picked from commit 22a10fc)

Author: deivid-rodriguez

test/rubygems/test_gem_bundler_version_finder.rb

@@ -45,6 +45,8 @@ def test_bundler_version_with_bundle_update_bundler
     assert_equal v("1.1.1.1"), bvf.bundler_version
     ARGV.replace %w[update --bundler\ 1.1.1.2 --bundler --bundler 1.1.1.1 gem_name]
     assert_equal v("1.1.1.1"), bvf.bundler_version
+    $0 = "/foo/bar/bundler"
+    assert_equal v("1.1.1.1"), bvf.bundler_version
     $0 = "other"
     assert_nil bvf.bundler_version
   end