Update changelog to insert newline, target test branch

.github/changelog_manager.rb

@@ -109,7 +109,7 @@ def build_entry(api_version, version_number, date)
 
       <<~ENTRY
         ## [#{version_number}] - #{date_str} (#{api_version} API)
-        
+
         ### Changed
         - #{message}
       ENTRY
@@ -148,7 +148,9 @@ def insert_entries(changelog, entries)
       rest = lines[first_entry_index..]
 
       # Combine: header + new entries + rest
-      (header + entries.map { |e| e.rstrip } + [''] + rest).join("\n")
+      # Each entry is separated by a blank line for readability
+      entry_lines = entries.flat_map { |e| e.rstrip.split("\n") + [''] }
+      (header + entry_lines + rest).join("\n")
     end
   end
 end

.github/spec/changelog_manager_spec.rb

@@ -141,6 +141,28 @@ def read_changelog
       changed_count = updated_content.scan(/### Changed/).length
       expect(changed_count).to be >= 2 # At least 2 from the new entries
     end
+
+    it 'separates multiple entries with blank lines' do
+      setup_changelog
+      setup_version_directory('v20250224', v20250224_package_fixture)
+      setup_version_directory('v20111101', v20111101_package_fixture)
+
+      result = ChangelogManager.update('v20250224,v20111101')
+
+      expect(result).to be true
+      updated_content = read_changelog
+
+      # The v20250224 entry block should be followed by a blank line before the v20111101 entry
+      # Match: end of v20250224 entry's Changed bullet, blank line, then v20111101 header
+      expect(updated_content).to match(
+        /Updated v20250224 API specification.*?\n\n## \[\d+\.\d+\.\d+\] - \d{4}-\d{2}-\d{2} \(v20111101 API\)/m
+      )
+
+      # The v20111101 entry block should be followed by a blank line before existing entries
+      expect(updated_content).to match(
+        /Updated v20111101 API specification.*?\n\n## \[2\.0\.0\]/m
+      )
+    end
   end
 
   describe '.update with date range behavior' do

.github/workflows/test-auto-generate.yml

@@ -68,6 +68,8 @@ jobs:
       fail-fast: false
     steps:
       - uses: actions/checkout@v3
+        with:
+          ref: test-auto-generate
       - uses: actions/setup-node@v3
         with:
           node-version: "20"