Declare Liquid and base64 runtime dependencies

Author: tobi

Gemfile

@@ -23,6 +23,4 @@ group :development do
   gem "activesupport", require: false
 end
 
-gem "base64", "~> 0.3.0"
-
 gem "bigdecimal", "~> 4.0"

liquid-spec.gemspec

@@ -26,7 +26,8 @@ Gem::Specification.new do |spec|
   spec.bindir = "bin"
   spec.executables = ["liquid-spec"]
 
-  # No runtime dependencies on liquid - the adapter provides it
+  spec.add_dependency("base64", "~> 0.3.0")
+  spec.add_dependency("liquid", "~> 5.13")
   spec.add_dependency("super_diff", "~> 0.18")
 
   spec.require_paths = ["lib"]

test/gemspec_test.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+require_relative "test_helper"
+
+class GemspecTest < Minitest::Test
+  GEMSPEC_PATH = File.expand_path("../liquid-spec.gemspec", __dir__)
+
+  def test_required_runtime_dependencies_are_declared
+    gemspec = Gem::Specification.load(GEMSPEC_PATH)
+    dependencies = gemspec.runtime_dependencies.to_h { |dependency| [dependency.name, dependency.requirement] }
+
+    assert_equal Gem::Requirement.new("~> 0.3.0"), dependencies.fetch("base64")
+    assert_equal Gem::Requirement.new("~> 5.13"), dependencies.fetch("liquid")
+  end
+end