From e5ad0da4534ee253e59b2a338c4dc7411432b104 Mon Sep 17 00:00:00 2001
From: Andy Waite <13400+andyw8@users.noreply.github.com>
Date: Thu, 8 Aug 2024 11:42:40 -0400
Subject: [PATCH] Apply earl's suggestion

---
 lib/ruby_lsp/setup_bundler.rb | 10 ++++---
 test/setup_bundler_test.rb    | 50 +++++++++++++++++------------------
 2 files changed, 31 insertions(+), 29 deletions(-)

diff --git a/lib/ruby_lsp/setup_bundler.rb b/lib/ruby_lsp/setup_bundler.rb
index 903f43a3d..af354f9a2 100644
--- a/lib/ruby_lsp/setup_bundler.rb
+++ b/lib/ruby_lsp/setup_bundler.rb
@@ -285,11 +285,13 @@ def correct_relative_remote_paths
     # Detects if the project is a Rails app by looking if the superclass of the main class is `Rails::Application`
     sig { returns(T::Boolean) }
     def rails_app?
-      config = Pathname.new("config/application.rb").expand_path
-      application_contents = config.read if config.exist?
-      return false unless application_contents
+      /class .* < Rails::Application/.match?(rails_application_content)
+    end
 
-      /class .* < Rails::Application/.match?(application_contents)
+    sig { returns(T.nilable(String)) }
+    def rails_application_content
+      config = Pathname.new("config/application.rb").expand_path
+      config.read if config.exist?
     end
   end
 end
diff --git a/test/setup_bundler_test.rb b/test/setup_bundler_test.rb
index 77f3b6059..a65d7b3ca 100644
--- a/test/setup_bundler_test.rb
+++ b/test/setup_bundler_test.rb
@@ -75,33 +75,33 @@ def test_creates_custom_bundle
   end
 
   def test_creates_custom_bundle_for_a_rails_app
-    Dir.mktmpdir do |dir|
-      Dir.chdir(dir) do
-        FileUtils.mkdir(File.join(dir, "config"))
-        File.write(File.join(dir, "config", "application.rb"), <<~RUBY)
-          module MyApp
-            class Application < Rails::Application
-            end
-          end
-        RUBY
-
-        Object.any_instance.expects(:system).with(
-          bundle_env(".ruby-lsp/Gemfile"),
-          "(bundle check || bundle install) 1>&2",
-        ).returns(true)
-        Bundler::LockfileParser.any_instance.expects(:dependencies).returns({ "rails" => true }).at_least_once
-        run_script
+    Object.any_instance.expects(:system).with(
+      bundle_env(".ruby-lsp/Gemfile"),
+      "(bundle check || bundle install) 1>&2",
+    ).returns(true)
 
-        assert_path_exists(".ruby-lsp")
-        assert_path_exists(".ruby-lsp/Gemfile")
-        assert_path_exists(".ruby-lsp/Gemfile.lock")
-        assert_path_exists(".ruby-lsp/main_lockfile_hash")
-        gemfile_content = File.read(".ruby-lsp/Gemfile")
-        assert_match("ruby-lsp", gemfile_content)
-        assert_match("debug", gemfile_content)
-        assert_match("ruby-lsp-rails", gemfile_content)
+    # There is some unknown state leak with Bundler which prevents us from creating the
+    # folder structure ourselves lest we encounter flaky tests
+    RubyLsp::SetupBundler.any_instance.stubs(:rails_application_content).returns(<<~RUBY)
+      module MyApp
+        class Application < Rails::Application
+        end
       end
-    end
+    RUBY
+
+    Bundler::LockfileParser.any_instance.expects(:dependencies).returns({ "rails" => true }).at_least_once
+
+    run_script
+
+    assert_path_exists(".ruby-lsp")
+    assert_path_exists(".ruby-lsp/Gemfile")
+    assert_path_exists(".ruby-lsp/Gemfile.lock")
+    assert_path_exists(".ruby-lsp/main_lockfile_hash")
+    assert_match("ruby-lsp", File.read(".ruby-lsp/Gemfile"))
+    assert_match("debug", File.read(".ruby-lsp/Gemfile"))
+    assert_match("ruby-lsp-rails", File.read(".ruby-lsp/Gemfile"))
+  ensure
+    FileUtils.rm_r(".ruby-lsp") if Dir.exist?(".ruby-lsp")
   end
 
   def test_changing_lockfile_causes_custom_bundle_to_be_rebuilt