fix: build

spec/browser/xvfb_spec.rb

@@ -50,7 +50,8 @@
       expect(process.xvfb.screen_size).to eq("1024x768x24")
     ensure
       xvfb_browser&.quit
-      expect(process_alive?(process.xvfb.pid)).to be(false)
+      pid = process&.xvfb&.pid
+      expect(process_alive?(pid)).to be(false) if pid
     end
   end
 

spec/browser_spec.rb

@@ -468,6 +468,7 @@
         page.go_to("/ferrum/simple")
       end
 
+      sleep 1 # It may take longer to close the target
       expect(browser.contexts.size).to eq(1)
       expect(browser.targets.size).to eq(0)
     end

spec/page/screenshot_spec.rb

@@ -138,17 +138,20 @@ def create_screenshot(**options)
     it "supports screenshotting the page with different quality settings" do
       file2 = "#{PROJECT_ROOT}/spec/tmp/screenshot2.jpeg"
       file3 = "#{PROJECT_ROOT}/spec/tmp/screenshot3.jpeg"
-      FileUtils.rm_f([file2, file3])
+      file4 = "#{PROJECT_ROOT}/spec/tmp/screenshot4.#{format}"
+      FileUtils.rm_f([file2, file3, file4])
 
       begin
         browser.go_to
         browser.screenshot(path: file, quality: 0) # ignored for png
         browser.screenshot(path: file2) # defaults to a quality of 75
         browser.screenshot(path: file3, quality: 100)
-        expect(File.size(file)).to be > File.size(file2) # png by default is bigger
+        browser.screenshot(path: file4, quality: 60) # ignored for png
+
+        expect(File.size(file)).to eq(File.size(file4))
         expect(File.size(file2)).to be < File.size(file3)
       ensure
-        FileUtils.rm_f([file2, file3])
+        FileUtils.rm_f([file2, file3, file4])
       end
     end