Start with some dependencies and a Rakefile

.ruby-version

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+3.2

Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "sequel"
+
+group :dev do
+  gem "minitest"
+  gem "rake"
+end

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    bigdecimal (3.1.4)
+    minitest (5.20.0)
+    rake (13.0.6)
+    sequel (5.73.0)
+      bigdecimal
+
+PLATFORMS
+  arm64-darwin-22
+
+DEPENDENCIES
+  minitest
+  rake
+  sequel
+
+BUNDLED WITH
+   2.4.1

Rakefile

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+require "minitest/test_task"
+
+Minitest::TestTask.create