Increase number of lines used in Danger feature_category scan

Danger currently reports feature_category as missing on the top
level `RSpec.describe` if the describe declaration spans more than
2 lines.

OK:
```
RSpec.describe SomeClass, :js,
  feature_category: 'category' do
```

'Fetaure category missing':
```
RSpec.describe SomeClass,
  :js,
  feature_category: 'category' do
```

This change allows this check to support top level `RSpec.describe`
declarations that span up to 5 lines.

spec/tooling/danger/specs_spec.rb

@@ -259,6 +259,10 @@
         "  ee: true do",
         "\n",
         "RSpec.describe Issues :aggregate_failures,",
+        "  feature_category: :team_planning do",
+        "\n",
+        "RSpec.describe MergeRequest :aggregate_failures,",
+        "  :js,",
         "  feature_category: :team_planning do"
       ]
     end
@@ -275,7 +279,11 @@
         "+  feature_category: planning_analytics do",
         "+RSpec.describe Epics :aggregate_failures,",
         "+  ee: true do",
-        "+RSpec.describe Issues :aggregate_failures,"
+        "+RSpec.describe Issues :aggregate_failures,",
+        "+RSpec.describe MergeRequest :aggregate_failures,",
+        "+  :js,",
+        "+  feature_category: :team_planning do",
+        "+RSpec.describe 'line in commit diff but no longer in working copy' do"
       ]
     end
 

tooling/danger/specs.rb

@@ -90,15 +90,17 @@ def add_suggestions_for_feature_category(filename)
         changed_lines.each_with_index do |changed_line, i|
           next unless changed_line =~ RSPEC_TOP_LEVEL_DESCRIBE_REGEX
 
-          next_line_in_file = file_lines[file_lines.find_index(changed_line.delete_prefix('+')) + 1]
-
-          if changed_line.include?(FEATURE_CATEGORY_KEYWORD) || next_line_in_file.to_s.include?(FEATURE_CATEGORY_KEYWORD)
-            next
-          end
-
           line_number = file_lines.find_index(changed_line.delete_prefix('+'))
           next unless line_number
 
+          # Get the top level RSpec.describe line and the next 5 lines
+          lines_to_check = file_lines[line_number, 5]
+          # Remove all the lines after the first one that ends in `do`
+          last_line_number_of_describe_declaration = lines_to_check.index { |line| line.end_with?(' do') }
+          lines_to_check = lines_to_check[0..last_line_number_of_describe_declaration]
+
+          next if lines_to_check.any? { |line| line.include?(FEATURE_CATEGORY_KEYWORD) }
+
           suggested_line = file_lines[line_number]
 
           markdown(comment(FEATURE_CATEGORY_SUGGESTION, suggested_line), file: filename, line: line_number.succ)