[ruby/rubygems] Remove raise from stub to rely on flag for test assertions

ruby/rubygems@7ebc1abafd

Co-authored-by: hsbt <12301+hsbt@users.noreply.github.com>

Author: 2 people

test/rubygems/test_gem_commands_push_command.rb

@@ -166,7 +166,7 @@ def test_execute_attestation_skipped_on_non_rubygems_host
     @cmd.options[:args] = [@path]
 
     attest_called = false
-    @cmd.stub(:attest!, proc { attest_called = true; raise "attest! should not be called" }) do
+    @cmd.stub(:attest!, proc { attest_called = true }) do
       @cmd.execute
     end
 
@@ -189,7 +189,7 @@ def test_execute_attestation_skipped_on_jruby
     Object.const_set :RUBY_ENGINE, "jruby"
 
     begin
-      @cmd.stub(:attest!, proc { attest_called = true; raise "attest! should not be called" }) do
+      @cmd.stub(:attest!, proc { attest_called = true }) do
         @cmd.execute
       end