ssl: prefer SSLContext#max_version= in tests

Avoid using the deprecated OpenSSL::SSL::SSLContext#ssl_version= outside
the tests specifically written for it.

Author: rhenium

test/openssl/test_ssl.rb

@@ -645,15 +645,15 @@ def test_sslctx_set_params
 
   def test_post_connect_check_with_anon_ciphers
     ctx_proc = -> ctx {
-      ctx.ssl_version = :TLSv1_2
+      ctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
       ctx.ciphers = "aNULL"
       ctx.tmp_dh = Fixtures.pkey("dh-1")
       ctx.security_level = 0
     }
 
     start_server(ctx_proc: ctx_proc) { |port|
       ctx = OpenSSL::SSL::SSLContext.new
-      ctx.ssl_version = :TLSv1_2
+      ctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
       ctx.ciphers = "aNULL"
       ctx.security_level = 0
       server_connect(port, ctx) { |ssl|
@@ -1688,12 +1688,12 @@ def test_sync_close_without_connect
   def test_get_ephemeral_key
     # kRSA
     ctx_proc1 = proc { |ctx|
-      ctx.ssl_version = :TLSv1_2
+      ctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
       ctx.ciphers = "kRSA"
     }
     start_server(ctx_proc: ctx_proc1, ignore_listener_error: true) do |port|
       ctx = OpenSSL::SSL::SSLContext.new
-      ctx.ssl_version = :TLSv1_2
+      ctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
       ctx.ciphers = "kRSA"
       begin
         server_connect(port, ctx) { |ssl| assert_nil ssl.tmp_key }
@@ -1704,15 +1704,15 @@ def test_get_ephemeral_key
     end
 
     # DHE
-    # TODO: How to test this with TLS 1.3?
+    # TODO: SSL_CTX_set1_groups() is required for testing this with TLS 1.3
     ctx_proc2 = proc { |ctx|
-      ctx.ssl_version = :TLSv1_2
+      ctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
       ctx.ciphers = "EDH"
       ctx.tmp_dh = Fixtures.pkey("dh-1")
     }
     start_server(ctx_proc: ctx_proc2) do |port|
       ctx = OpenSSL::SSL::SSLContext.new
-      ctx.ssl_version = :TLSv1_2
+      ctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
       ctx.ciphers = "EDH"
       server_connect(port, ctx) { |ssl|
         assert_instance_of OpenSSL::PKey::DH, ssl.tmp_key

test/openssl/test_ssl_session.rb

@@ -5,7 +5,9 @@
 
 class OpenSSL::TestSSLSession < OpenSSL::SSLTestCase
   def test_session
-    ctx_proc = proc { |ctx| ctx.ssl_version = :TLSv1_2 }
+    ctx_proc = proc { |ctx|
+      ctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
+    }
     start_server(ctx_proc: ctx_proc) do |port|
       server_connect_with_session(port, nil, nil) { |ssl|
         session = ssl.session
@@ -143,7 +145,7 @@ def test_resumption
 
   def test_server_session_cache
     ctx_proc = Proc.new do |ctx|
-      ctx.ssl_version = :TLSv1_2
+      ctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
       ctx.options |= OpenSSL::SSL::OP_NO_TICKET
     end
 
@@ -197,7 +199,7 @@ def test_server_session_cache
       10.times do |i|
         connections = i
         cctx = OpenSSL::SSL::SSLContext.new
-        cctx.ssl_version = :TLSv1_2
+        cctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
         server_connect_with_session(port, cctx, first_session) { |ssl|
           ssl.puts("abc"); assert_equal "abc\n", ssl.gets
           first_session ||= ssl.session
@@ -299,11 +301,11 @@ def test_ctx_server_session_cb
     connections = nil
     called = {}
     cctx = OpenSSL::SSL::SSLContext.new
-    cctx.ssl_version = :TLSv1_2
+    cctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
     sctx = nil
     ctx_proc = Proc.new { |ctx|
       sctx = ctx
-      ctx.ssl_version = :TLSv1_2
+      ctx.max_version = OpenSSL::SSL::TLS1_2_VERSION
       ctx.options |= OpenSSL::SSL::OP_NO_TICKET
 
       # get_cb is called whenever a client proposed to resume a session but