test/net/http/test_https.rb: The test logic was buggy

The expected certs must be `[CA_CERT, SERVER_CERT]` before 1.1.1g and
`[SERVER_CERT]` after 1.1.1h.

test/net/http/test_https.rb

@@ -45,8 +45,8 @@ class TestNetHTTPS < Test::Unit::TestCase
       assert_equal($test_net_http_data, res.body)
     }
     # TODO: OpenSSL 1.1.1h seems to yield only SERVER_CERT; need to check the incompatibility
-    certs.each do |cert|
-      assert_include([SERVER_CERT.to_der, CA_CERT.to_der], cert.to_der)
+    certs.zip([CA_CERT, SERVER_CERT][-certs.size..]) do |actual, expected|
+      assert_equal(expected.to_der, actual.to_der)
     end
   rescue SystemCallError
     skip $!
@@ -66,8 +66,8 @@ class TestNetHTTPS < Test::Unit::TestCase
       assert_equal($test_net_http_data, res.body)
     }
     # TODO: OpenSSL 1.1.1h seems to yield only SERVER_CERT; need to check the incompatibility
-    certs.each do |cert|
-      assert_include([SERVER_CERT.to_der, CA_CERT.to_der], cert.to_der)
+    certs.zip([CA_CERT, SERVER_CERT][-certs.size..]) do |actual, expected|
+      assert_equal(expected.to_der, actual.to_der)
     end
   end