diff --git a/lib/bundler/cli/gem.rb b/lib/bundler/cli/gem.rb
index 6174e40bc0..2c22ff8bab 100644
--- a/lib/bundler/cli/gem.rb
+++ b/lib/bundler/cli/gem.rb
@@ -104,9 +104,17 @@ module Bundler
           )
           config[:test_task] = :spec
         when "minitest"
+          # Generate path for minitest target file (FileList["test/**/test_*.rb"])
+          #   foo     => test/test_foo.rb
+          #   foo-bar => test/foo/test_bar.rb
+          #   foo_bar => test/test_foo_bar.rb
+          paths = namespaced_path.rpartition("/")
+          paths[2] = "test_#{paths[2]}"
+          minitest_namespaced_path = paths.join("")
+
           templates.merge!(
             "test/minitest/test_helper.rb.tt" => "test/test_helper.rb",
-            "test/minitest/test_newgem.rb.tt" => "test/test_#{underscored_name}.rb"
+            "test/minitest/test_newgem.rb.tt" => "test/#{minitest_namespaced_path}.rb"
           )
           config[:test_task] = :test
         when "test-unit"
diff --git a/spec/bundler/commands/newgem_spec.rb b/spec/bundler/commands/newgem_spec.rb
index 45bd3d5d4e..a41a0de508 100644
--- a/spec/bundler/commands/newgem_spec.rb
+++ b/spec/bundler/commands/newgem_spec.rb
@@ -28,6 +28,8 @@ RSpec.describe "bundle gem" do
 
   let(:require_path) { "mygem" }
 
+  let(:minitest_test_file_path) { "test/test_mygem.rb" }
+
   before do
     sys_exec("git config --global user.name 'Bundler User'")
     sys_exec("git config --global user.email user@example.com")
@@ -696,22 +698,18 @@ RSpec.describe "bundle gem" do
     end
 
     context "gem.test setting set to rspec and --test is set to minitest" do
-      let(:underscored_require_path) { require_path.tr("/", "_") }
-
       before do
         bundle "config set gem.test rspec"
         bundle "gem #{gem_name} --test=minitest"
       end
 
       it "builds spec skeleton" do
-        expect(bundled_app("#{gem_name}/test/test_#{underscored_require_path}.rb")).to exist
+        expect(bundled_app("#{gem_name}/#{minitest_test_file_path}")).to exist
         expect(bundled_app("#{gem_name}/test/test_helper.rb")).to exist
       end
     end
 
     context "--test parameter set to minitest" do
-      let(:underscored_require_path) { require_path.tr("/", "_") }
-
       before do
         bundle "gem #{gem_name} --test=minitest"
       end
@@ -726,7 +724,7 @@ RSpec.describe "bundle gem" do
       end
 
       it "builds spec skeleton" do
-        expect(bundled_app("#{gem_name}/test/test_#{underscored_require_path}.rb")).to exist
+        expect(bundled_app("#{gem_name}/#{minitest_test_file_path}")).to exist
         expect(bundled_app("#{gem_name}/test/test_helper.rb")).to exist
       end
 
@@ -735,11 +733,11 @@ RSpec.describe "bundle gem" do
       end
 
       it "requires 'test_helper'" do
-        expect(bundled_app("#{gem_name}/test/test_#{underscored_require_path}.rb").read).to include(%(require "test_helper"))
+        expect(bundled_app("#{gem_name}/#{minitest_test_file_path}").read).to include(%(require "test_helper"))
       end
 
       it "creates a default test which fails" do
-        expect(bundled_app("#{gem_name}/test/test_#{underscored_require_path}.rb").read).to include("assert false")
+        expect(bundled_app("#{gem_name}/#{minitest_test_file_path}").read).to include("assert false")
       end
     end
 
@@ -1304,6 +1302,8 @@ RSpec.describe "bundle gem" do
 
     let(:require_relative_path) { "test_gem" }
 
+    let(:minitest_test_file_path) { "test/test_test_gem.rb" }
+
     let(:flags) { nil }
 
     it "does not nest constants" do
@@ -1359,6 +1359,8 @@ RSpec.describe "bundle gem" do
 
     let(:require_relative_path) { "gem" }
 
+    let(:minitest_test_file_path) { "test/test/test_gem.rb" }
+
     it "nests constants so they work" do
       bundle "gem #{gem_name}"
       expect(bundled_app("#{gem_name}/lib/#{require_path}/version.rb").read).to match(/module Test\n  module Gem/)