[Fix #9891] Fix --auto-gen-config bug for Style/HashSyntax

We must call ruby19_check() even if there are no hash rockets in the
inspected node, to give it a chance to register that the correct style
has been detected. The generation of .rubocop_todo.yml depends on it.

changelog/fix_autogenconfig_bug_for_HashSyntax.md

@@ -0,0 +1 @@
+* [#9891](https://github.com/rubocop/rubocop/issues/9891): Fix `--auto-gen-config` bug for `Style/HashSyntax`. ([@jonas054][])

lib/rubocop/cop/style/hash_syntax.rb

@@ -74,7 +74,7 @@ def on_hash(node)
             ruby19_no_mixed_keys_check(pairs)
           elsif style == :no_mixed_keys
             no_mixed_keys_check(pairs)
-          elsif node.source.include?('=>')
+          else
             ruby19_check(pairs)
           end
         end

spec/rubocop/cli/auto_gen_config_spec.rb

@@ -1190,6 +1190,33 @@ def function(arg1, arg2, arg3, arg4, arg5, arg6, arg7)
       end
     end
 
+    it 'generates EnforcedStyle parameter if it solves all offenses' do
+      create_file('example1.rb', ['# frozen_string_literal: true', '', 'h(:a => 1)'])
+
+      expect(cli.run(['--auto-gen-config'])).to eq(0)
+      expect(File.readlines('.rubocop_todo.yml')[10..-1].join)
+        .to eq(<<~YAML)
+          # Configuration parameters: UseHashRocketsWithSymbolValues, PreferHashRocketsForNonAlnumEndingSymbols.
+          # SupportedStyles: ruby19, hash_rockets, no_mixed_keys, ruby19_no_mixed_keys
+          Style/HashSyntax:
+            EnforcedStyle: hash_rockets
+        YAML
+    end
+
+    it 'generates Exclude if no EnforcedStyle solves all offenses' do
+      create_file('example1.rb', ['# frozen_string_literal: true', '', 'h(:a => 1)', 'h(b: 2)'])
+
+      expect(cli.run(['--auto-gen-config'])).to eq(0)
+      expect(File.readlines('.rubocop_todo.yml')[10..-1].join)
+        .to eq(<<~YAML)
+          # Configuration parameters: EnforcedStyle, UseHashRocketsWithSymbolValues, PreferHashRocketsForNonAlnumEndingSymbols.
+          # SupportedStyles: ruby19, hash_rockets, no_mixed_keys, ruby19_no_mixed_keys
+          Style/HashSyntax:
+            Exclude:
+              - 'example1.rb'
+        YAML
+    end
+
     it 'can be called when there are no files to inspection' do
       expect(cli.run(['--auto-gen-config'])).to eq(0)
     end