Add Gemfile

Defer to dependencies in the gemspec

Gemfile

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+source "https://rubygems.org"
+git_source(:github) { |repo| "https://github.com/#{repo}.git" }
+
+gemspec

Gemfile.lock

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+PATH
+  remote: .
+  specs:
+    minitest-shopify (0.1.0)
+      capybara
+      liquid
+      minitest
+      puma
+      rackup
+      selenium-webdriver
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
+    base64 (0.2.0)
+    capybara (3.40.0)
+      addressable
+      matrix
+      mini_mime (>= 0.1.3)
+      nokogiri (~> 1.11)
+      rack (>= 1.6.0)
+      rack-test (>= 0.6.3)
+      regexp_parser (>= 1.5, < 3.0)
+      xpath (~> 3.2)
+    liquid (5.5.1)
+    logger (1.6.1)
+    matrix (0.4.2)
+    mini_mime (1.1.5)
+    minitest (5.25.1)
+    nio4r (2.7.3)
+    nokogiri (1.16.7-aarch64-linux)
+      racc (~> 1.4)
+    nokogiri (1.16.7-arm-linux)
+      racc (~> 1.4)
+    nokogiri (1.16.7-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.16.7-x86-linux)
+      racc (~> 1.4)
+    nokogiri (1.16.7-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.16.7-x86_64-linux)
+      racc (~> 1.4)
+    public_suffix (6.0.1)
+    puma (6.4.2)
+      nio4r (~> 2.0)
+    racc (1.8.1)
+    rack (3.1.7)
+    rack-test (2.1.0)
+      rack (>= 1.3)
+    rackup (2.1.0)
+      rack (>= 3)
+      webrick (~> 1.8)
+    regexp_parser (2.9.2)
+    rexml (3.3.7)
+    rubyzip (2.3.2)
+    selenium-webdriver (4.24.0)
+      base64 (~> 0.2)
+      logger (~> 1.4)
+      rexml (~> 3.2, >= 3.2.5)
+      rubyzip (>= 1.2.2, < 3.0)
+      websocket (~> 1.0)
+    webrick (1.8.1)
+    websocket (1.2.11)
+    xpath (3.2.0)
+      nokogiri (~> 1.8)
+
+PLATFORMS
+  aarch64-linux
+  arm-linux
+  arm64-darwin
+  x86-linux
+  x86_64-darwin
+  x86_64-linux
+
+DEPENDENCIES
+  minitest-shopify!
+
+BUNDLED WITH
+   2.5.9