From 85f5b78f5a3ad469239c8fe6239a6bfb648101d6 Mon Sep 17 00:00:00 2001
From: Eric Proulx <eproulx@petalmd.com>
Date: Sat, 12 Apr 2025 14:56:47 +0200
Subject: [PATCH 1/9] Add linting feature through Grape.config and `lint_api!`
 method Add spec All specs are now linted

---
 lib/grape.rb             |  1 +
 lib/grape/dsl/routing.rb |  4 ++++
 lib/grape/endpoint.rb    |  5 +++++
 spec/grape/api_spec.rb   | 21 +++++++++++++++++++++
 spec/spec_helper.rb      |  1 +
 5 files changed, 32 insertions(+)

diff --git a/lib/grape.rb b/lib/grape.rb
index a1e6f511c..6415c16f5 100644
--- a/lib/grape.rb
+++ b/lib/grape.rb
@@ -75,6 +75,7 @@ def self.deprecator
 
   configure do |config|
     config.param_builder = :hash_with_indifferent_access
+    config.lint_api = false
     config.compile_methods!
   end
 end
diff --git a/lib/grape/dsl/routing.rb b/lib/grape/dsl/routing.rb
index 8c32db364..d73977119 100644
--- a/lib/grape/dsl/routing.rb
+++ b/lib/grape/dsl/routing.rb
@@ -81,6 +81,10 @@ def do_not_route_options!
           namespace_inheritable(:do_not_route_options, true)
         end
 
+        def lint_api!
+          namespace_inheritable(:lint_api, true)
+        end
+
         def do_not_document!
           namespace_inheritable(:do_not_document, true)
         end
diff --git a/lib/grape/endpoint.rb b/lib/grape/endpoint.rb
index 2e5136fda..0b7725055 100644
--- a/lib/grape/endpoint.rb
+++ b/lib/grape/endpoint.rb
@@ -358,6 +358,7 @@ def build_stack(helpers)
       format = namespace_inheritable(:format)
 
       stack.use Rack::Head
+      stack.use Rack::Lint if lint_api?
       stack.use Class.new(Grape::Middleware::Error),
                 helpers: helpers,
                 format: format,
@@ -408,5 +409,9 @@ def build_response_cookies
         Rack::Utils.set_cookie_header! header, name, cookie_value
       end
     end
+
+    def lint_api?
+      namespace_inheritable(:lint_api) || Grape.config.lint_api
+    end
   end
 end
diff --git a/spec/grape/api_spec.rb b/spec/grape/api_spec.rb
index f16b31ee2..b45fcee5a 100644
--- a/spec/grape/api_spec.rb
+++ b/spec/grape/api_spec.rb
@@ -4738,4 +4738,25 @@ def uniqe_id_route
       expect(last_response.body).to eq('unknown params_builder: unknown')
     end
   end
+
+  describe '.lint_api!' do
+    let(:app) do
+      Class.new(described_class) do
+        lint_api!
+        get '/' do
+          status 42
+        end
+      end
+    end
+
+    around do |example|
+      Grape.config.lint_api = false
+      example.run
+      Grape.config.lint_api = true
+    end
+
+    it 'raises a Rack::Lint error' do
+      expect { get '/' }.to raise_error(Rack::Lint::LintError, 'Status must be an Integer >=100')
+    end
+  end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 06cb282a0..2df1bdd54 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -13,6 +13,7 @@
   end
 end
 
+Grape.config.lint_api = true # lint all apis by default
 Grape::Util::Registry.include(Deregister)
 # issue with ruby 2.7 with ^. We need to extend it again
 Grape::Validations.extend(Grape::Util::Registry) if Gem::Version.new(RUBY_VERSION).release < Gem::Version.new('3.0')

From e0d1d10cc09194fac8a81385c7ca62c2ba1c1834 Mon Sep 17 00:00:00 2001
From: Eric Proulx <eproulx@petalmd.com>
Date: Sat, 12 Apr 2025 15:10:22 +0200
Subject: [PATCH 2/9] Remove error message for Lint::Error

---
 spec/grape/api_spec.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/spec/grape/api_spec.rb b/spec/grape/api_spec.rb
index b45fcee5a..f85c94f22 100644
--- a/spec/grape/api_spec.rb
+++ b/spec/grape/api_spec.rb
@@ -4756,7 +4756,8 @@ def uniqe_id_route
     end
 
     it 'raises a Rack::Lint error' do
-      expect { get '/' }.to raise_error(Rack::Lint::LintError, 'Status must be an Integer >=100')
+      # Status must be an Integer >= 100
+      expect { get '/' }.to raise_error(Rack::Lint::LintError)
     end
   end
 end

From e4d5c35c8eef8ec09c13d2fb8246b05df7b018a1 Mon Sep 17 00:00:00 2001
From: Eric Proulx <eproulx@petalmd.com>
Date: Sat, 12 Apr 2025 18:27:15 +0200
Subject: [PATCH 3/9] Add ruby 3.1 to 3.2 to spec integrations Add `yaml-dev`
 in Dockerfile

---
 .github/workflows/test.yml              | 69 +++++++++++++++++++++++++
 docker/Dockerfile                       |  2 +-
 spec/integration/rails/mounting_spec.rb |  7 +--
 3 files changed, 74 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 14a663818..87e057d65 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -36,6 +36,51 @@ jobs:
           - ruby: '2.7'
             gemfile: gemfiles/rack_3_0.gemfile
             specs: 'spec/integration/rack_3_0'
+          - ruby: '3.1'
+            gemfile: gemfiles/grape_entity.gemfile
+            specs: 'spec/integration/grape_entity'
+          - ruby: '3.1'
+            gemfile: gemfiles/hashie.gemfile
+            specs: 'spec/integration/hashie'
+          - ruby: '3.1'
+            gemfile: gemfiles/dry_validation.gemfile
+            specs: 'spec/integration/dry_validation'
+          - ruby: '3.1'
+            gemfile: gemfiles/rails_6_1.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.1'
+            gemfile: gemfiles/rails_7_0.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.1'
+            gemfile: gemfiles/rails_7_1.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.1'
+            gemfile: gemfiles/rails_7_2.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.2'
+            gemfile: gemfiles/grape_entity.gemfile
+            specs: 'spec/integration/grape_entity'
+          - ruby: '3.2'
+            gemfile: gemfiles/hashie.gemfile
+            specs: 'spec/integration/hashie'
+          - ruby: '3.2'
+            gemfile: gemfiles/dry_validation.gemfile
+            specs: 'spec/integration/dry_validation'
+          - ruby: '3.2'
+            gemfile: gemfiles/rails_6_1.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.2'
+            gemfile: gemfiles/rails_7_0.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.2'
+            gemfile: gemfiles/rails_7_1.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.2'
+            gemfile: gemfiles/rails_7_2.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.2'
+            gemfile: gemfiles/rails_8_0.gemfile
+            specs: 'spec/integration/rails'
           - ruby: '3.3'
             gemfile: gemfiles/grape_entity.gemfile
             specs: 'spec/integration/grape_entity'
@@ -60,6 +105,30 @@ jobs:
           - ruby: '3.3'
             gemfile: gemfiles/rails_8_0.gemfile
             specs: 'spec/integration/rails'
+          - ruby: '3.4'
+            gemfile: gemfiles/grape_entity.gemfile
+            specs: 'spec/integration/grape_entity'
+          - ruby: '3.4'
+            gemfile: gemfiles/hashie.gemfile
+            specs: 'spec/integration/hashie'
+          - ruby: '3.4'
+            gemfile: gemfiles/dry_validation.gemfile
+            specs: 'spec/integration/dry_validation'
+          - ruby: '3.4'
+            gemfile: gemfiles/rails_6_1.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.4'
+            gemfile: gemfiles/rails_7_0.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.4'
+            gemfile: gemfiles/rails_7_1.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.4'
+            gemfile: gemfiles/rails_7_2.gemfile
+            specs: 'spec/integration/rails'
+          - ruby: '3.4'
+            gemfile: gemfiles/rails_8_0.gemfile
+            specs: 'spec/integration/rails'
         exclude:
           - ruby: '2.7'
             gemfile: gemfiles/rails_7_2.gemfile
diff --git a/docker/Dockerfile b/docker/Dockerfile
index 2bc484ecf..5cca3aa5b 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -7,7 +7,7 @@ ENV RUBYOPT --enable-frozen-string-literal --yjit
 ENV LD_PRELOAD libjemalloc.so.2
 ENV MALLOC_CONF dirty_decay_ms:1000,narenas:2,background_thread:true
 
-RUN apk add --update --no-cache make gcc git libc-dev gcompat jemalloc && \
+RUN apk add --update --no-cache make gcc git libc-dev yaml-dev gcompat jemalloc && \
     gem update --system && gem install bundler
 
 WORKDIR $LIB_PATH
diff --git a/spec/integration/rails/mounting_spec.rb b/spec/integration/rails/mounting_spec.rb
index 3d8288b93..eef8e9ad2 100644
--- a/spec/integration/rails/mounting_spec.rb
+++ b/spec/integration/rails/mounting_spec.rb
@@ -17,7 +17,7 @@
       ActiveSupport::Dependencies.autoload_paths = []
       ActiveSupport::Dependencies.autoload_once_paths = []
 
-      Class.new(Rails::Application) do
+      app = Class.new(Rails::Application) do
         config.eager_load = false
         config.load_defaults "#{Rails::VERSION::MAJOR}.#{Rails::VERSION::MINOR}"
         config.api_only = true
@@ -28,15 +28,16 @@
           mount GrapeApi => '/'
 
           get 'up', to: lambda { |_env|
-            ['200', {}, ['hello world']]
+            [200, {}, ['hello world']]
           }
         end
       end
+      app.initialize!
+      Rack::Lint.new(app)
     end
 
     before do
       stub_const('GrapeApi', api)
-      app.initialize!
     end
 
     it 'cascades' do

From abfdaea282cb9bf7e86555d36d05a1970c6001ca Mon Sep 17 00:00:00 2001
From: Eric Proulx <eproulx@petalmd.com>
Date: Sun, 13 Apr 2025 09:31:19 +0200
Subject: [PATCH 4/9] Rename `lint_api!` to `lint!`

---
 lib/grape.rb             | 2 +-
 lib/grape/dsl/routing.rb | 4 ++--
 lib/grape/endpoint.rb    | 6 +++---
 spec/grape/api_spec.rb   | 8 ++++----
 spec/spec_helper.rb      | 2 +-
 5 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/lib/grape.rb b/lib/grape.rb
index 6415c16f5..4dfffc257 100644
--- a/lib/grape.rb
+++ b/lib/grape.rb
@@ -75,7 +75,7 @@ def self.deprecator
 
   configure do |config|
     config.param_builder = :hash_with_indifferent_access
-    config.lint_api = false
+    config.lint = false
     config.compile_methods!
   end
 end
diff --git a/lib/grape/dsl/routing.rb b/lib/grape/dsl/routing.rb
index d73977119..4db89e5d3 100644
--- a/lib/grape/dsl/routing.rb
+++ b/lib/grape/dsl/routing.rb
@@ -81,8 +81,8 @@ def do_not_route_options!
           namespace_inheritable(:do_not_route_options, true)
         end
 
-        def lint_api!
-          namespace_inheritable(:lint_api, true)
+        def lint!
+          namespace_inheritable(:lint, true)
         end
 
         def do_not_document!
diff --git a/lib/grape/endpoint.rb b/lib/grape/endpoint.rb
index 0b7725055..e3bd6b61f 100644
--- a/lib/grape/endpoint.rb
+++ b/lib/grape/endpoint.rb
@@ -358,7 +358,7 @@ def build_stack(helpers)
       format = namespace_inheritable(:format)
 
       stack.use Rack::Head
-      stack.use Rack::Lint if lint_api?
+      stack.use Rack::Lint if lint?
       stack.use Class.new(Grape::Middleware::Error),
                 helpers: helpers,
                 format: format,
@@ -410,8 +410,8 @@ def build_response_cookies
       end
     end
 
-    def lint_api?
-      namespace_inheritable(:lint_api) || Grape.config.lint_api
+    def lint?
+      namespace_inheritable(:lint) || Grape.config.lint
     end
   end
 end
diff --git a/spec/grape/api_spec.rb b/spec/grape/api_spec.rb
index f85c94f22..b530a3deb 100644
--- a/spec/grape/api_spec.rb
+++ b/spec/grape/api_spec.rb
@@ -4739,10 +4739,10 @@ def uniqe_id_route
     end
   end
 
-  describe '.lint_api!' do
+  describe '.lint!' do
     let(:app) do
       Class.new(described_class) do
-        lint_api!
+        lint!
         get '/' do
           status 42
         end
@@ -4750,9 +4750,9 @@ def uniqe_id_route
     end
 
     around do |example|
-      Grape.config.lint_api = false
+      Grape.config.lint = false
       example.run
-      Grape.config.lint_api = true
+      Grape.config.lint = true
     end
 
     it 'raises a Rack::Lint error' do
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 2df1bdd54..4a8e2f1b0 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -13,7 +13,7 @@
   end
 end
 
-Grape.config.lint_api = true # lint all apis by default
+Grape.config.lint = true # lint all apis by default
 Grape::Util::Registry.include(Deregister)
 # issue with ruby 2.7 with ^. We need to extend it again
 Grape::Validations.extend(Grape::Util::Registry) if Gem::Version.new(RUBY_VERSION).release < Gem::Version.new('3.0')

From 2caf6da01605c154fe3d8272055a3c86f8e63334 Mon Sep 17 00:00:00 2001
From: Eric Proulx <eproulx@petalmd.com>
Date: Sun, 13 Apr 2025 09:33:43 +0200
Subject: [PATCH 5/9] Revert test.yml

---
 .github/workflows/test.yml | 69 --------------------------------------
 1 file changed, 69 deletions(-)

diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 87e057d65..14a663818 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -36,51 +36,6 @@ jobs:
           - ruby: '2.7'
             gemfile: gemfiles/rack_3_0.gemfile
             specs: 'spec/integration/rack_3_0'
-          - ruby: '3.1'
-            gemfile: gemfiles/grape_entity.gemfile
-            specs: 'spec/integration/grape_entity'
-          - ruby: '3.1'
-            gemfile: gemfiles/hashie.gemfile
-            specs: 'spec/integration/hashie'
-          - ruby: '3.1'
-            gemfile: gemfiles/dry_validation.gemfile
-            specs: 'spec/integration/dry_validation'
-          - ruby: '3.1'
-            gemfile: gemfiles/rails_6_1.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.1'
-            gemfile: gemfiles/rails_7_0.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.1'
-            gemfile: gemfiles/rails_7_1.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.1'
-            gemfile: gemfiles/rails_7_2.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.2'
-            gemfile: gemfiles/grape_entity.gemfile
-            specs: 'spec/integration/grape_entity'
-          - ruby: '3.2'
-            gemfile: gemfiles/hashie.gemfile
-            specs: 'spec/integration/hashie'
-          - ruby: '3.2'
-            gemfile: gemfiles/dry_validation.gemfile
-            specs: 'spec/integration/dry_validation'
-          - ruby: '3.2'
-            gemfile: gemfiles/rails_6_1.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.2'
-            gemfile: gemfiles/rails_7_0.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.2'
-            gemfile: gemfiles/rails_7_1.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.2'
-            gemfile: gemfiles/rails_7_2.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.2'
-            gemfile: gemfiles/rails_8_0.gemfile
-            specs: 'spec/integration/rails'
           - ruby: '3.3'
             gemfile: gemfiles/grape_entity.gemfile
             specs: 'spec/integration/grape_entity'
@@ -105,30 +60,6 @@ jobs:
           - ruby: '3.3'
             gemfile: gemfiles/rails_8_0.gemfile
             specs: 'spec/integration/rails'
-          - ruby: '3.4'
-            gemfile: gemfiles/grape_entity.gemfile
-            specs: 'spec/integration/grape_entity'
-          - ruby: '3.4'
-            gemfile: gemfiles/hashie.gemfile
-            specs: 'spec/integration/hashie'
-          - ruby: '3.4'
-            gemfile: gemfiles/dry_validation.gemfile
-            specs: 'spec/integration/dry_validation'
-          - ruby: '3.4'
-            gemfile: gemfiles/rails_6_1.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.4'
-            gemfile: gemfiles/rails_7_0.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.4'
-            gemfile: gemfiles/rails_7_1.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.4'
-            gemfile: gemfiles/rails_7_2.gemfile
-            specs: 'spec/integration/rails'
-          - ruby: '3.4'
-            gemfile: gemfiles/rails_8_0.gemfile
-            specs: 'spec/integration/rails'
         exclude:
           - ruby: '2.7'
             gemfile: gemfiles/rails_7_2.gemfile

From ed493d09bd3080f697a6076e147290416d2d16bb Mon Sep 17 00:00:00 2001
From: Eric Proulx <eproulx@petalmd.com>
Date: Thu, 1 May 2025 19:25:43 +0200
Subject: [PATCH 6/9] Add README.md and CHANGELOG.md Fix typo in UPGRADING.md

---
 CHANGELOG.md |  1 +
 README.md    | 21 +++++++++++++++++++++
 UPGRADING.md |  2 +-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index e7ef011ac..0740742f7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@
 * [#2549](https://github.com/ruby-grape/grape/pull/2549): Delegate cookies management to `Grape::Request` - [@ericproulx](https://github.com/ericproulx).
 * [#2554](https://github.com/ruby-grape/grape/pull/2554): Remove `Grape::Http::Headers` and `Grape::Util::Lazy::Object` - [@ericproulx](https://github.com/ericproulx).
 * [#2556](https://github.com/ruby-grape/grape/pull/2556): Remove unused `Grape::Request::DEFAULT_PARAMS_BUILDER` constant - [@eriklovmo](https://github.com/eriklovmo).
+* [#2557](https://github.com/ruby-grape/grape/pull/2557): Add lint! - [@ericproulx](https://github.com/ericproulx).
 * Your contribution here.
 
 #### Fixes
diff --git a/README.md b/README.md
index 7fe411835..28a7c1526 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,8 @@
     - [Header](#header)
     - [Accept-Version Header](#accept-version-header)
     - [Param](#param)
+- [Linting](#linting)
+  - [Bug in Rack::ETag under Rack 3.X](#bug-in-racketag-under-rack-3x)
 - [Describing Methods](#describing-methods)
 - [Configuration](#configuration)
 - [Parameters](#parameters)
@@ -650,6 +652,25 @@ version 'v1', using: :param, parameter: 'v'
     curl http://localhost:9292/statuses/public_timeline?v=v1
 
 
+## Linting
+
+You can check if your API is in conformance with [Rack's specification](https://github.com/rack/rack/blob/main/SPEC.rdoc) by calling `lint!` at the API level or through [configuration](#configuration):
+```ruby
+# API Level
+class Api < Grape::API
+  lint!
+end
+# OR through configuration
+Grape.configure do |config|
+  config.lint = true
+end
+# OR
+Grape.config.lint = true
+```
+
+### Bug in Rack::ETag under Rack 3.X
+If you're using Rack 3.X and the `Rack::Etag` middleware (used by [Rails](https://guides.rubyonrails.org/rails_on_rack.html#inspecting-middleware-stack)), a [bug](https://github.com/rack/rack/pull/2324) related to linting has been fixed in [3.1.13](https://github.com/rack/rack/blob/v3.1.13/CHANGELOG.md#3113---2025-04-13) and [3.0.15](https://github.com/rack/rack/blob/v3.1.13/CHANGELOG.md#3015---2025-04-13) respectively.
+
 ## Describing Methods
 
 You can add a description to API methods and namespaces. The description would be used by [grape-swagger][grape-swagger] to generate swagger compliant documentation.
diff --git a/UPGRADING.md b/UPGRADING.md
index 2ace6622d..8c1744959 100644
--- a/UPGRADING.md
+++ b/UPGRADING.md
@@ -130,7 +130,7 @@ When using together with `Grape::Extensions::Hash::ParamBuilder`, `route_param`
 This was a regression introduced by [#2326](https://github.com/ruby-grape/grape/pull/2326) in Grape v1.8.0.
 
 ```ruby
-grape.configure do |config|
+Grape.configure do |config|
   config.param_builder = Grape::Extensions::Hash::ParamBuilder
 end
 

From 7bde62c06d463b1df94f2042833c36567e905825 Mon Sep 17 00:00:00 2001
From: Eric Proulx <eproulx@petalmd.com>
Date: Sat, 3 May 2025 17:10:05 +0200
Subject: [PATCH 7/9] Fix CHANGELOG

---
 README.md | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 28a7c1526..863a8d3f3 100644
--- a/README.md
+++ b/README.md
@@ -654,17 +654,19 @@ version 'v1', using: :param, parameter: 'v'
 
 ## Linting
 
-You can check if your API is in conformance with [Rack's specification](https://github.com/rack/rack/blob/main/SPEC.rdoc) by calling `lint!` at the API level or through [configuration](#configuration):
+You can check whether your API is in conformance with the [Rack's specification](https://github.com/rack/rack/blob/main/SPEC.rdoc) by calling `lint!` at the API level or through [configuration](#configuration).
+
 ```ruby
-# API Level
 class Api < Grape::API
   lint!
 end
-# OR through configuration
+```
+```ruby
 Grape.configure do |config|
   config.lint = true
 end
-# OR
+```
+```ruby
 Grape.config.lint = true
 ```
 

From 2439121a8176271228e104a5529e693a75b0f21b Mon Sep 17 00:00:00 2001
From: Eric Proulx <eproulx@petalmd.com>
Date: Sat, 3 May 2025 17:11:58 +0200
Subject: [PATCH 8/9] Use `lint!` in rails spec

---
 spec/integration/rails/mounting_spec.rb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/spec/integration/rails/mounting_spec.rb b/spec/integration/rails/mounting_spec.rb
index eef8e9ad2..39d31c761 100644
--- a/spec/integration/rails/mounting_spec.rb
+++ b/spec/integration/rails/mounting_spec.rb
@@ -4,6 +4,7 @@
   context 'rails mounted' do
     let(:api) do
       Class.new(Grape::API) do
+        lint!
         get('/test_grape') { 'rails mounted' }
       end
     end
@@ -17,7 +18,7 @@
       ActiveSupport::Dependencies.autoload_paths = []
       ActiveSupport::Dependencies.autoload_once_paths = []
 
-      app = Class.new(Rails::Application) do
+      Class.new(Rails::Application) do
         config.eager_load = false
         config.load_defaults "#{Rails::VERSION::MAJOR}.#{Rails::VERSION::MINOR}"
         config.api_only = true
@@ -32,12 +33,11 @@
           }
         end
       end
-      app.initialize!
-      Rack::Lint.new(app)
     end
 
     before do
       stub_const('GrapeApi', api)
+      app.initialize!
     end
 
     it 'cascades' do

From 3347801dfe06327ad935aa8fcf81d5cc747227d1 Mon Sep 17 00:00:00 2001
From: Eric Proulx <eproulx@petalmd.com>
Date: Sun, 4 May 2025 15:34:32 +0200
Subject: [PATCH 9/9] Fix api_spec lint with ensure

---
 spec/grape/api_spec.rb | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/spec/grape/api_spec.rb b/spec/grape/api_spec.rb
index b530a3deb..b2fa81e75 100644
--- a/spec/grape/api_spec.rb
+++ b/spec/grape/api_spec.rb
@@ -4750,9 +4750,11 @@ def uniqe_id_route
     end
 
     around do |example|
+      @lint = Grape.config.lint
       Grape.config.lint = false
       example.run
-      Grape.config.lint = true
+    ensure
+      Grape.config.lint = @lint
     end
 
     it 'raises a Rack::Lint error' do