https://git.ruby-lang.org/ruby.git/commit/?id=b8dcad8d32

From b8dcad8d32a5405cbbf29f6705c8975f1773170a Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Wed, 26 May 2021 19:51:33 +0900
Subject: Defer to require prime for OpenSSL::TestBN

---
 test/openssl/test_bn.rb | 41 +++++++++++++++++++++++------------------
 1 file changed, 23 insertions(+), 18 deletions(-)

diff --git a/test/openssl/test_bn.rb b/test/openssl/test_bn.rb
index 547d334..6c26b5e 100644
--- a/test/openssl/test_bn.rb
+++ b/test/openssl/test_bn.rb
@@ -1,7 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/test/openssl/test_bn.rb#L1
 # coding: us-ascii
 # frozen_string_literal: true
 require_relative 'utils'
-require "prime"
 
 if defined?(OpenSSL)
 
@@ -230,23 +229,29 @@ class OpenSSL::TestBN < OpenSSL::TestCase https://github.com/ruby/ruby/blob/trunk/test/openssl/test_bn.rb#L229
     }
   end
 
-  def test_prime
-    p1 = OpenSSL::BN.generate_prime(32)
-    assert_include(0...2**32, p1)
-    assert_equal(true, Prime.prime?(p1.to_i))
-    p2 = OpenSSL::BN.generate_prime(32, true)
-    assert_equal(true, Prime.prime?((p2.to_i - 1) / 2))
-    p3 = OpenSSL::BN.generate_prime(32, false, 4)
-    assert_equal(1, p3 % 4)
-    p4 = OpenSSL::BN.generate_prime(32, false, 4, 3)
-    assert_equal(3, p4 % 4)
-
-    assert_equal(true, p1.prime?)
-    assert_equal(true, p2.prime?)
-    assert_equal(true, p3.prime?)
-    assert_equal(true, p4.prime?)
-    assert_equal(true, @e3.prime?)
-    assert_equal(true, @e3.prime_fasttest?)
+  begin
+    require "prime"
+
+    def test_prime
+      p1 = OpenSSL::BN.generate_prime(32)
+      assert_include(0...2**32, p1)
+      assert_equal(true, Prime.prime?(p1.to_i))
+      p2 = OpenSSL::BN.generate_prime(32, true)
+      assert_equal(true, Prime.prime?((p2.to_i - 1) / 2))
+      p3 = OpenSSL::BN.generate_prime(32, false, 4)
+      assert_equal(1, p3 % 4)
+      p4 = OpenSSL::BN.generate_prime(32, false, 4, 3)
+      assert_equal(3, p4 % 4)
+
+      assert_equal(true, p1.prime?)
+      assert_equal(true, p2.prime?)
+      assert_equal(true, p3.prime?)
+      assert_equal(true, p4.prime?)
+      assert_equal(true, @e3.prime?)
+      assert_equal(true, @e3.prime_fasttest?)
+    end
+  rescue LoadError
+    # prime is the bundled gems at Ruby 3.1
   end
 
   def test_num_bits_bytes
-- 
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