Cleanup section string extraction

ee/lib/gitlab/code_owners/file.rb

@@ -60,7 +60,7 @@ module Gitlab
 
       def get_parsed_sectional_data
         parsed = {}
-        section = ::Gitlab::CodeOwners::Entry::DEFAULT_SECTION.downcase
+        section = ::Gitlab::CodeOwners::Entry::DEFAULT_SECTION
 
         parsed[section] = {}
 
@@ -70,13 +70,13 @@ module Gitlab
           next if skip?(line)
 
           if line.starts_with?('[') && line.end_with?(']')
-            section = line[1...-1].downcase
+            section = line[1...-1].strip
             parsed[section] ||= {}
 
             next
           end
 
-          extract_entry_and_populate_parsed(line, parsed, section.downcase)
+          extract_entry_and_populate_parsed(line, parsed, section)
         end
 
         parsed

ee/spec/lib/gitlab/code_owners/file_spec.rb

@@ -52,7 +52,7 @@ describe Gitlab::CodeOwners::File do
         data = file.parsed_data
 
         expect(data.keys.length).to eq(1)
-        expect(data.keys).to contain_exactly(::Gitlab::CodeOwners::Entry::DEFAULT_SECTION.downcase)
+        expect(data.keys).to contain_exactly(::Gitlab::CodeOwners::Entry::DEFAULT_SECTION)
       end
 
       context "when CODEOWNERS file contains multiple sections" do
@@ -66,13 +66,13 @@ describe Gitlab::CodeOwners::File do
           data = file.parsed_data
 
           expect(data.keys.length).to eq(3)
-          expect(data.keys).to contain_exactly("codeowners", "documentation", "database")
+          expect(data.keys).to contain_exactly("codeowners", "Documentation", "Database")
         end
 
         where(:section, :patterns) do
           "codeowners"    | ["/**/ee/**/*"]
-          "documentation" | ["/**/README.md", "/**/ee/docs", "/**/docs"]
-          "database"      | ["/**/README.md", "/**/model/db"]
+          "Documentation" | ["/**/README.md", "/**/ee/docs", "/**/docs"]
+          "Database"      | ["/**/README.md", "/**/model/db"]
         end
 
         with_them do