Use File.write instead of File.open block to write index.html

Closes #69.

Author: sferik

.rubocop.yml

@@ -27,6 +27,8 @@ Metrics/ClassLength:
   CountAsOne:
     - array
     - hash
+  Exclude:
+    - "test/**/*"
 
 Metrics/ModuleLength:
   CountAsOne:

lib/simplecov-html.rb

@@ -38,9 +38,7 @@ def format(result)
           end
         end
 
-        File.open(File.join(output_path, "index.html"), "wb") do |file|
-          file.puts template("layout").result(binding)
-        end
+        File.write(File.join(output_path, "index.html"), template("layout").result(binding), mode: "wb")
         puts output_message(result) unless @silent
       end
 

test/test_simple_cov-html.rb

@@ -91,8 +91,7 @@ def bad_template.result(_binding)
 
   def test_silenced_output
     result = SimpleCov::Result.new({fixtures_path.join("sample.rb").to_s => CoverageFixtures::SAMPLE_RB})
-    formatter = SimpleCov::Formatter::HTMLFormatter.new(silent: true)
-    stdout, = capture_io { formatter.format(result) }
+    stdout, = capture_io { SimpleCov::Formatter::HTMLFormatter.new(silent: true).format(result) }
 
     assert_empty stdout
   end