diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5f303528..ec498c0c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,11 @@
 
 ## Unreleased
 
-- Allow to override path for schema matching with `env[OpenapiFirst::PATH]` (https://github.com/ahx/openapi_first/pull/345)
+## 2.7.0
+
+- Allow to override path for schema matching with `config.path = ->(request) { '/prefix' + request.path  } ` (https://github.com/ahx/openapi_first/issues/349)
+- Support passing in a Definition instance when registering an OAD for tests (https://github.com/ahx/openapi_first/issues/353)
+- Fix registering multiple APIs for testing (https://github.com/ahx/openapi_first/issues/352)
 
 ## 2.6.0
 
diff --git a/Gemfile.lock b/Gemfile.lock
index dae8e339..9f95e130 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    openapi_first (2.6.0)
+    openapi_first (2.7.0)
       hana (~> 1.3)
       json_schemer (>= 2.1, < 3.0)
       openapi_parameters (>= 0.3.3, < 2.0)
@@ -45,7 +45,7 @@ GEM
     bigdecimal (3.1.9)
     builder (3.3.0)
     concurrent-ruby (1.3.5)
-    connection_pool (2.5.0)
+    connection_pool (2.5.3)
     crass (1.0.6)
     diff-lcs (1.6.1)
     docile (1.4.1)
@@ -54,7 +54,7 @@ GEM
     hana (1.3.7)
     i18n (1.14.7)
       concurrent-ruby (~> 1.0)
-    json (2.10.2)
+    json (2.11.3)
     json_schemer (2.4.0)
       bigdecimal
       hana (~> 1.3)
@@ -62,7 +62,7 @@ GEM
       simpleidn (~> 0.2)
     language_server-protocol (3.17.0.4)
     lint_roller (1.1.0)
-    logger (1.6.6)
+    logger (1.7.0)
     loofah (2.24.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -73,13 +73,13 @@ GEM
       racc (~> 1.4)
     openapi_parameters (0.5.0)
       rack (>= 2.2)
-    parallel (1.26.3)
-    parser (3.3.7.2)
+    parallel (1.27.0)
+    parser (3.3.8.0)
       ast (~> 2.4.1)
       racc
     prism (1.4.0)
     racc (1.8.1)
-    rack (3.1.12)
+    rack (3.1.13)
     rack-session (2.1.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
@@ -103,14 +103,14 @@ GEM
       rspec-mocks (~> 3.13.0)
     rspec-core (3.13.3)
       rspec-support (~> 3.13.0)
-    rspec-expectations (3.13.3)
+    rspec-expectations (3.13.4)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-mocks (3.13.2)
+    rspec-mocks (3.13.3)
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
-    rspec-support (3.13.2)
-    rubocop (1.74.0)
+    rspec-support (3.13.3)
+    rubocop (1.75.4)
       json (~> 2.3)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.1.0)
@@ -118,15 +118,15 @@ GEM
       parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 2.9.3, < 3.0)
-      rubocop-ast (>= 1.38.0, < 2.0)
+      rubocop-ast (>= 1.44.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 4.0)
-    rubocop-ast (1.43.0)
+    rubocop-ast (1.44.1)
       parser (>= 3.3.7.2)
       prism (~> 1.4)
-    rubocop-performance (1.24.0)
+    rubocop-performance (1.25.0)
       lint_roller (~> 1.1)
-      rubocop (>= 1.72.1, < 2.0)
+      rubocop (>= 1.75.0, < 2.0)
       rubocop-ast (>= 1.38.0, < 2.0)
     ruby-progressbar (1.13.0)
     securerandom (0.4.1)
diff --git a/README.md b/README.md
index 7a0bef82..8684db6d 100644
--- a/README.md
+++ b/README.md
@@ -350,50 +350,7 @@ Here your OpenAPI schema defines endpoints starting with `/resource` but your ac
 oad = OpenapiFirst.load('openapi.yaml') do |config|
   config.path = ->(req) { request.path.delete_prefix('/api') }
 end
-# Add your custom middleware
 use OpenapiFirst::Middlewares::RequestValidation, oad
-
-# You can add ResponseValidation without any customization.
-use OpenapiFirst::Middlewares::ResponseValidation, 'openapi.yaml'
-```
-
-In this case, you might want to serve APIs on `/api` while serving rendered pages on other paths which are not managed by OpenAPI schema in a single application.
-
-You can add some lines to selectively validate only paths under `/api` while bypassing others:
-
-```diff
-    env[OpenapiFirst::PATH] = request.path.to_s.sub(%r"^/api", "")
-
-+    # Only validate paths under /api/
-+    if request.path.start_with?('/api/')
-       super
-+    else
-+      @app.call(env)
-+    end
-   end
-```
-
-And the final code is:
-
-```ruby
-class CustomOpenAPIValidation < OpenapiFirst::Middlewares::RequestValidation
-  def call(env)
-    request = Rack::Request.new(env)
-
-    # Strip the "/api" prefix for schema matching
-    env[OpenapiFirst::PATH] = request.path.to_s.sub(%r"^/api", "")
-
-    # Only validate paths under /api/
-    if request.path.start_with?('/api/')
-      super
-    else
-      @app.call(env)
-    end
-  end
-end
-
-use CustomOpenAPIValidation, 'openapi.yaml'
-use OpenapiFirst::Middlewares::ResponseValidation, 'openapi.yaml'
 ```
 
 ## Development
diff --git a/benchmarks/Gemfile.lock b/benchmarks/Gemfile.lock
index d677ad25..43b09ee6 100644
--- a/benchmarks/Gemfile.lock
+++ b/benchmarks/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ..
   specs:
-    openapi_first (2.6.0)
+    openapi_first (2.7.0)
       hana (~> 1.3)
       json_schemer (>= 2.1, < 3.0)
       openapi_parameters (>= 0.3.3, < 2.0)
@@ -16,7 +16,7 @@ GEM
     benchmark-memory (0.2.0)
       memory_profiler (~> 1)
     bigdecimal (3.1.9)
-    committee (5.5.2)
+    committee (5.5.3)
       json_schema (~> 0.14, >= 0.14.3)
       openapi_parser (~> 2.0)
       rack (>= 1.5, < 3.2)
@@ -34,14 +34,14 @@ GEM
     nio4r (2.7.4)
     openapi_parameters (0.5.0)
       rack (>= 2.2)
-    openapi_parser (2.2.4)
+    openapi_parser (2.2.6)
     optparse (0.6.0)
     profile-viewer (0.0.4)
       optparse
       webrick
     puma (6.6.0)
       nio4r (~> 2.0)
-    rack (3.1.12)
+    rack (3.1.13)
     rack-protection (4.1.1)
       base64 (>= 0.1.0)
       logger (>= 1.6.0)
diff --git a/examples/rails_app/Gemfile.lock b/examples/rails_app/Gemfile.lock
index 9c13a335..038f61db 100644
--- a/examples/rails_app/Gemfile.lock
+++ b/examples/rails_app/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    openapi_first (2.2.3)
+    openapi_first (2.7.0)
       hana (~> 1.3)
       json_schemer (>= 2.1, < 3.0)
       openapi_parameters (>= 0.3.3, < 2.0)
@@ -88,10 +88,10 @@ GEM
       msgpack (~> 1.2)
     builder (3.3.0)
     concurrent-ruby (1.3.5)
-    connection_pool (2.5.0)
+    connection_pool (2.5.3)
     crass (1.0.6)
     date (3.4.1)
-    debug (1.9.2)
+    debug (1.10.0)
       irb (~> 1.10)
       reline (>= 0.3.8)
     drb (2.2.1)
@@ -99,18 +99,19 @@ GEM
     globalid (1.2.1)
       activesupport (>= 6.1)
     hana (1.3.7)
-    i18n (1.14.6)
+    i18n (1.14.7)
       concurrent-ruby (~> 1.0)
     io-console (0.8.0)
-    irb (1.14.3)
+    irb (1.15.2)
+      pp (>= 0.6.0)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
-    json_schemer (2.3.0)
+    json_schemer (2.4.0)
       bigdecimal
       hana (~> 1.3)
       regexp_parser (~> 2.0)
       simpleidn (~> 0.2)
-    logger (1.6.5)
+    logger (1.7.0)
     loofah (2.24.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -122,40 +123,43 @@ GEM
     marcel (1.0.4)
     mini_mime (1.1.5)
     mini_portile2 (2.8.8)
-    minitest (5.25.4)
-    msgpack (1.7.3)
-    net-imap (0.5.5)
+    minitest (5.25.5)
+    msgpack (1.8.0)
+    net-imap (0.5.8)
       date
       net-protocol
     net-pop (0.1.2)
       net-protocol
     net-protocol (0.2.2)
       timeout
-    net-smtp (0.5.0)
+    net-smtp (0.5.1)
       net-protocol
     nio4r (2.7.4)
-    nokogiri (1.18.1)
+    nokogiri (1.18.8)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.18.1-aarch64-linux-gnu)
+    nokogiri (1.18.8-aarch64-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.18.1-arm-linux-gnu)
+    nokogiri (1.18.8-arm-linux-gnu)
       racc (~> 1.4)
-    nokogiri (1.18.1-arm64-darwin)
+    nokogiri (1.18.8-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.18.1-x86_64-darwin)
+    nokogiri (1.18.8-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.18.1-x86_64-linux-gnu)
+    nokogiri (1.18.8-x86_64-linux-gnu)
       racc (~> 1.4)
-    openapi_parameters (0.4.0)
+    openapi_parameters (0.5.0)
       rack (>= 2.2)
-    psych (5.2.2)
+    pp (0.6.2)
+      prettyprint
+    prettyprint (0.2.0)
+    psych (5.2.4)
       date
       stringio
-    puma (6.4.3)
+    puma (6.6.0)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (3.1.8)
+    rack (3.1.13)
     rack-session (2.1.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)
@@ -193,14 +197,14 @@ GEM
       thor (~> 1.0, >= 1.2.2)
       zeitwerk (~> 2.6)
     rake (13.2.1)
-    rdoc (6.11.0)
+    rdoc (6.13.1)
       psych (>= 4.0.0)
     regexp_parser (2.10.0)
-    reline (0.6.0)
+    reline (0.6.1)
       io-console (~> 0.5)
     securerandom (0.4.1)
     simpleidn (0.2.3)
-    stringio (3.1.2)
+    stringio (3.1.7)
     thor (1.3.2)
     timeout (0.4.3)
     tzinfo (2.0.6)
@@ -210,7 +214,7 @@ GEM
       base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
-    zeitwerk (2.7.1)
+    zeitwerk (2.7.2)
 
 PLATFORMS
   aarch64-linux
diff --git a/examples/rails_app/test/integration/attachments_api_test.rb b/examples/rails_app/test/integration/attachments_api_test.rb
index b2276d4d..f1e89e34 100644
--- a/examples/rails_app/test/integration/attachments_api_test.rb
+++ b/examples/rails_app/test/integration/attachments_api_test.rb
@@ -3,10 +3,9 @@
 require 'test_helper'
 
 class StationsApiTest < ActionDispatch::IntegrationTest
-  include OpenapiFirst::Test::Methods
-
   test 'GET /attachments/{attachment_id}' do
     get '/attachments/42abc', as: :json
+
     assert_api_conform(status: 200, api: :attachments)
   end
 end
diff --git a/examples/rails_app/test/integration/stations_api_test.rb b/examples/rails_app/test/integration/stations_api_test.rb
index f067bd0d..0ec8d23a 100644
--- a/examples/rails_app/test/integration/stations_api_test.rb
+++ b/examples/rails_app/test/integration/stations_api_test.rb
@@ -3,8 +3,6 @@
 require 'test_helper'
 
 class StationsApiTest < ActionDispatch::IntegrationTest
-  include OpenapiFirst::Test::Methods
-
   test 'GET /stations' do
     get '/stations'
 
diff --git a/examples/rails_app/test/integration/trips_api_test.rb b/examples/rails_app/test/integration/trips_api_test.rb
index d97dff91..54592cbc 100644
--- a/examples/rails_app/test/integration/trips_api_test.rb
+++ b/examples/rails_app/test/integration/trips_api_test.rb
@@ -1,8 +1,6 @@
 require 'test_helper'
 
 class TripsApiTest < ActionDispatch::IntegrationTest
-  include OpenapiFirst::Test::Methods
-
   test 'GET /trips' do
     get '/trips',
         params: { origin: 'efdbb9d1-02c2-4bc3-afb7-6788d8782b1e', destination: 'b2e783e1-c824-4d63-b37a-d8d698862f1d',
diff --git a/examples/rails_app/test/test_helper.rb b/examples/rails_app/test/test_helper.rb
index ca271d3d..1bce6720 100644
--- a/examples/rails_app/test/test_helper.rb
+++ b/examples/rails_app/test/test_helper.rb
@@ -1,21 +1,15 @@
 ENV['RAILS_ENV'] ||= 'test'
-require_relative '../config/environment'
-require 'rails/test_help'
 
 require 'openapi_first'
-OpenapiFirst::Test.register(Rails.root.join('../../spec/data/train-travel-api/openapi.yaml'))
-OpenapiFirst::Test.register(Rails.root.join('../../spec/data/attachments_openapi.yaml'), as: :attachments)
-
-OpenapiFirst::Test::Coverage.register(
-  Rails.root.join('../../spec/data/train-travel-api/openapi.yaml'),
-  Rails.root.join('../../spec/data/attachments_openapi.yaml')
-)
-OpenapiFirst::Test::Coverage.start
-
-Minitest.after_run do
-  OpenapiFirst::Test::Coverage.report
+OpenapiFirst::Test.setup do |test|
+  test.register Rails.root.join('../../spec/data/train-travel-api/openapi.yaml')
+  test.register Rails.root.join('../../spec/data/attachments_openapi.yaml'), as: :attachments
+  test.coverage_formatter_options = { verbose: true }
 end
 
+require_relative '../config/environment'
+require 'rails/test_help'
+
 module ActiveSupport
   class TestCase
     # Run tests in parallel with specified workers
@@ -25,12 +19,9 @@ class TestCase
   end
 end
 
-TEST_APP = OpenapiFirst::Test.app(TrainTravel::Application, spec: Rails.root.join('../../spec/data/attachments_openapi.yaml'))
 
 module ActionDispatch
   class IntegrationTest
-    def app
-      TEST_APP
-    end
+    include OpenapiFirst::Test::Methods[TrainTravel::Application]
   end
 end
diff --git a/lib/openapi_first/version.rb b/lib/openapi_first/version.rb
index 0e64a6e1..e39f983b 100644
--- a/lib/openapi_first/version.rb
+++ b/lib/openapi_first/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module OpenapiFirst
-  VERSION = '2.6.0'
+  VERSION = '2.7.0'
 end