From 909dfdc46de30609aca2dbbcb86eae281f0fff99 Mon Sep 17 00:00:00 2001
From: Soutaro Matsumoto <matsumoto@soutaro.com>
Date: Fri, 19 Dec 2025 09:43:30 +0900
Subject: [PATCH 1/4] bundle update minitest

---
 Gemfile.lock | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Gemfile.lock b/Gemfile.lock
index 819c9caca..3cc80bd47 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -69,7 +69,8 @@ GEM
     marcel (1.1.0)
     memory_profiler (1.1.0)
     mini_portile2 (2.8.9)
-    minitest (5.27.0)
+    minitest (6.0.0)
+      prism (~> 1.5)
     mutex_m (0.3.0)
     net-protocol (0.2.2)
       timeout

From 9093c46dbb71d0470200d0f1c4b0d6bbcbeeefab Mon Sep 17 00:00:00 2001
From: Soutaro Matsumoto <matsumoto@soutaro.com>
Date: Fri, 19 Dec 2025 09:46:07 +0900
Subject: [PATCH 2/4] Bundle minitest-mock

---
 Gemfile      | 1 +
 Gemfile.lock | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/Gemfile b/Gemfile
index 929569cda..273f08b49 100644
--- a/Gemfile
+++ b/Gemfile
@@ -52,6 +52,7 @@ gem 'pstore'
 
 group :minitest do
   gem "minitest"
+  gem "minitest-mock"
 end
 
 group :typecheck_test do
diff --git a/Gemfile.lock b/Gemfile.lock
index 3cc80bd47..cb6e2b8ed 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -71,6 +71,7 @@ GEM
     mini_portile2 (2.8.9)
     minitest (6.0.0)
       prism (~> 1.5)
+    minitest-mock (5.27.0)
     mutex_m (0.3.0)
     net-protocol (0.2.2)
       timeout
@@ -207,6 +208,7 @@ DEPENDENCIES
   json-schema
   memory_profiler
   minitest
+  minitest-mock
   mutex_m
   net-smtp
   nkf

From 5e70c94b3f7776a9445f9d8429d61015bed76850 Mon Sep 17 00:00:00 2001
From: Soutaro Matsumoto <matsumoto@soutaro.com>
Date: Fri, 19 Dec 2025 10:10:46 +0900
Subject: [PATCH 3/4] Refactor type_check_test.rb

Split tests for rspec and minitest.
---
 test/rbs/test/type_check_test.rb | 57 ++++++++++++++++++++------------
 1 file changed, 35 insertions(+), 22 deletions(-)

diff --git a/test/rbs/test/type_check_test.rb b/test/rbs/test/type_check_test.rb
index 71fc93231..f5935149c 100644
--- a/test/rbs/test/type_check_test.rb
+++ b/test/rbs/test/type_check_test.rb
@@ -625,22 +625,11 @@ def test_typecheck_args
     end
   end
 
-  def test_is_double
-    omit unless has_gem?("rspec")
-    omit if skip_minitest?
-
+  def test_is_double__rspec
     require "rspec/mocks/standalone"
-    require "minitest/mock"
 
     SignatureManager.new do |manager|
       manager.build do |env|
-        minitest_typecheck = Test::TypeCheck.new(
-          self_class: Integer,
-          builder: DefinitionBuilder.new(env: env),
-          sample_size: 100,
-          unchecked_classes: ['Minitest::Mock']
-        )
-
         rspec_typecheck = Test::TypeCheck.new(
           self_class: Integer,
           builder: DefinitionBuilder.new(env: env),
@@ -655,26 +644,50 @@ def test_is_double
           unchecked_classes: []
         )
 
-        minitest_mock = ::Minitest::Mock.new
         rspec_mock = RSPEC_MOCK[]
 
-        assert minitest_typecheck.is_double? minitest_mock
         assert rspec_typecheck.is_double? rspec_mock
-
-        refute minitest_typecheck.is_double? rspec_mock
-        refute rspec_typecheck.is_double? minitest_mock
-
-        refute minitest_typecheck.is_double? 1
-        refute minitest_typecheck.is_double? 'hi'
-        refute minitest_typecheck.is_double? nil
+        refute no_mock_typecheck.is_double? rspec_mock
 
         refute rspec_typecheck.is_double? 1
         refute rspec_typecheck.is_double? 'hi'
         refute rspec_typecheck.is_double? nil
+      end
+    end
+  end
 
-        refute no_mock_typecheck.is_double? minitest_mock
+  def test_is_double__minitest
+    # Minitest is optional dependency to make ruby-lsp-test-discovery work correctly.
+    # Omit this test when minitest is unavailable, or `NO_MINITEST` env var is set.
+    omit unless has_gem?("minitest-mock") && has_gem?("minitest")
+    omit if skip_minitest?
+
+    require "minitest/mock"
+
+    SignatureManager.new do |manager|
+      manager.build do |env|
+        minitest_typecheck = Test::TypeCheck.new(
+          self_class: Integer,
+          builder: DefinitionBuilder.new(env: env),
+          sample_size: 100,
+          unchecked_classes: ['Minitest::Mock']
+        )
+
+        no_mock_typecheck = Test::TypeCheck.new(
+          self_class: Integer,
+          builder: DefinitionBuilder.new(env: env),
+          sample_size: 100,
+          unchecked_classes: []
+        )
+
+        minitest_mock = ::Minitest::Mock.new
+
+        assert minitest_typecheck.is_double? minitest_mock
         refute no_mock_typecheck.is_double? minitest_mock
 
+        refute minitest_typecheck.is_double? 1
+        refute minitest_typecheck.is_double? 'hi'
+        refute minitest_typecheck.is_double? nil
       end
     end
   end

From 0cf442cfc38cac5164599705b28a0b59f0decc79 Mon Sep 17 00:00:00 2001
From: Soutaro Matsumoto <matsumoto@soutaro.com>
Date: Fri, 19 Dec 2025 10:12:18 +0900
Subject: [PATCH 4/4] Update test for minitest/mock

---
 test/rbs/test/runtime_test_test.rb | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/rbs/test/runtime_test_test.rb b/test/rbs/test/runtime_test_test.rb
index 7a1807fc2..89b75f8aa 100644
--- a/test/rbs/test/runtime_test_test.rb
+++ b/test/rbs/test/runtime_test_test.rb
@@ -142,6 +142,7 @@ def world: () -> void
   end
 
   def test_minitest
+    omit unless has_gem?("minitest-mock") && has_gem?("minitest")
     omit if skip_minitest?
 
     assert_test_success(other_env: { 'RBS_TEST_TARGET' => 'Foo', 'RBS_TEST_DOUBLE_SUITE' => 'minitest' }, rbs_content: <<RBS, ruby_content: <<RUBY)
@@ -156,6 +157,7 @@ def foo(integer)
 end
 
 require "minitest/autorun"
+require "minitest/mock"
 
 class FooTest < Minitest::Test
   def test_foo_mock