fix: remove instance_variable_set hack, use finalize in test

- Replace instance_variable_set(:@ToTal) with real passing assertions
- Fix deprecation warning by requiring capybara_screenshot_diff/minitest
- Integration test uses reporter.finalize instead of manual render+write

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: pftg

scripts/generate_sample_report.rb

@@ -6,6 +6,7 @@
 require "bundler/setup"
 require "active_support/core_ext/object/blank"
 require "capybara_screenshot_diff"
+require "capybara_screenshot_diff/minitest"
 require "capybara/screenshot/diff"
 require "capybara_screenshot_diff/reporters/html"
 
@@ -31,11 +32,14 @@
   CapybaraScreenshotDiff::ScreenshotAssertion.new(pair[:name]).tap { |a| a.compare = compare }
 end
 
-reporter.record(assertions)
-
-# Add some "passed" total for realistic stats
-reporter.instance_variable_set(:@total, reporter.total + 4)
+# Add passing assertions (identical images = no difference)
+passing = %w[dashboard settings profile users].map do |name|
+  compare = Capybara::Screenshot::Diff::ImageCompare.new("#{fixtures}/a.png", "#{fixtures}/a.png")
+  compare.processed
+  CapybaraScreenshotDiff::ScreenshotAssertion.new(name).tap { |a| a.compare = compare }
+end
 
+reporter.record(assertions + passing)
 File.write(output_path, reporter.render)
 
 puts "Generated: #{output_path}"

test/integration/report_screenshot_test.rb

@@ -51,7 +51,7 @@ def test_report_annotated_both
   def generate_sample_report
     reporter = CapybaraScreenshotDiff::Reporters::HTML.new(output_path: @report_path)
     reporter.record(build_assertions)
-    File.write(@report_path, reporter.render)
+    reporter.finalize
   end
 
   def build_assertions