Do not require test file in a forked process in tests

test/openssl/engine_utils.rb

@@ -0,0 +1,12 @@
+module EngineUtils
+  def get_engine
+    OpenSSL::Engine.by_id("openssl")
+  end
+
+  def crypt_data(data, key, mode)
+    cipher = yield
+    cipher.send mode
+    cipher.key = key
+    cipher.update(data) + cipher.final
+  end
+end

test/openssl/test_engine.rb

@@ -74,8 +74,8 @@ def test_openssl_engine_cipher_rc4
   # this is required because OpenSSL::Engine methods change global state
   def with_openssl(code, **opts)
     assert_separately([{ "OSSL_MDEBUG" => nil }, "-ropenssl"], <<~"end;", **opts)
-      require #{__FILE__.dump}
-      include OpenSSL::TestEngine::Utils
+      require 'engine_utils'
+      include EngineUtils
       #{code}
     end;
   end

test/openssl/test_fips.rb

@@ -12,8 +12,6 @@ def test_fips_mode_is_reentrant
   def test_fips_mode_get
     return unless OpenSSL::OPENSSL_FIPS
     assert_separately([{ "OSSL_MDEBUG" => nil }, "-ropenssl"], <<~"end;")
-      require #{__FILE__.dump}
-
       begin
         OpenSSL.fips_mode = true
         assert OpenSSL.fips_mode == true, ".fips_mode returns true when .fips_mode=true"