[rubygems/rubygems] Make sure tests at least load without openssl

https://github.com/rubygems/rubygems/commit/054d57f74b

lib/rubygems/s3_uri_signer.rb

@@ -1,6 +1,6 @@
 require 'base64'
 require 'digest'
-require 'openssl'
+require 'rubygems/openssl'
 
 ##
 # S3URISigner implements AWS SigV4 for S3 Source to avoid a dependency on the aws-sdk-* gems

test/rubygems/test_bundled_ca.rb

@@ -1,6 +1,12 @@
 # frozen_string_literal: true
 require 'rubygems/test_case'
 require 'net/http'
+require 'rubygems/openssl'
+
+unless defined?(OpenSSL::SSL)
+  warn 'Skipping bundled certificates tests.  openssl not found.'
+end
+
 require 'rubygems/request'
 
 # = Testing Bundled CA
@@ -52,4 +58,4 @@ class TestBundledCA < Gem::TestCase
   def test_accessing_new_index
     assert_https('fastly.rubygems.org')
   end
-end
+end if defined?(OpenSSL::SSL)

test/rubygems/test_gem_dependency_installer.rb

@@ -840,6 +840,8 @@ class TestGemDependencyInstaller < Gem::TestCase
     assert_equal %w[a-1-cpu-other_platform-1], inst.installed_gems.map {|s| s.full_name }
   end
 
+  require 'rubygems/openssl'
+
   if defined? OpenSSL
     def test_install_security_policy
       util_setup_gems

test/rubygems/test_gem_specification.rb

@@ -2431,6 +2431,9 @@ end
   end
 
   def test_to_ruby_with_rsa_key
+    require 'rubygems/openssl'
+    skip 'openssl is missing' unless defined?(OpenSSL::PKey::RSA)
+
     rsa_key = OpenSSL::PKey::RSA.new(2048)
     @a2.signing_key = rsa_key
     ruby_code = @a2.to_ruby