Add simplecov

It's been a while since I added/removed this here. I'm interested again

.gitignore

@@ -18,3 +18,4 @@
 /data
 /.env
 /public/build
+/coverage

Gemfile

@@ -27,6 +27,10 @@ gem "rugged"
 gem "selenium-webdriver"
 gem "simple_form"
 
+group :test do
+  gem "simplecov", require: false
+end
+
 group :development, :test do
   gem "factory_bot", require: false
   gem "minitest-spec-rails", require: false

Gemfile.lock

@@ -64,6 +64,7 @@ GEM
     debug (1.9.1)
       irb (~> 1.10)
       reline (>= 0.3.8)
+    docile (1.4.0)
     drb (2.2.0)
       ruby2_keywords
     erubi (1.12.0)
@@ -215,6 +216,12 @@ GEM
     simple_form (5.3.0)
       actionpack (>= 5.2)
       activemodel (>= 5.2)
+    simplecov (0.22.0)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.12.3)
+    simplecov_json_formatter (0.1.4)
     smart_properties (1.17.0)
     sorbet-runtime (0.5.11190)
     stringio (3.1.0)
@@ -269,6 +276,7 @@ DEPENDENCIES
   rugged
   selenium-webdriver
   simple_form
+  simplecov
   webmock
 
 BUNDLED WITH

test/test_helper.rb

@@ -2,6 +2,33 @@
 
 ENV["RAILS_ENV"] ||= "test"
 ENV["MT_NO_EXPECTATIONS"] ||= "1"
+
+require "simplecov"
+module SimpleCov
+  class SourceFile
+    def coverage_exceeding_source_warn
+      # no-op, https://github.com/simplecov-ruby/simplecov/issues/1057
+    end
+  end
+end
+
+SimpleCov.start "rails" do
+  enable_coverage :branch
+  enable_coverage_for_eval
+
+  groups.delete "Channels"
+  groups.delete "Mailers"
+  groups.delete "Libraries"
+
+  add_group "Sites", "app/logical/sites"
+  add_group "Scraper", "app/logical/scraper"
+  add_group "Views", "app/views"
+  add_group "Logical" do |src_file|
+    not_filtered_further = ["logical/sites", "logical/scraper"].none? { |e| src_file.filename.include? e }
+    not_filtered_further && src_file.filename.include?("app/logical")
+  end
+end
+
 require_relative "../config/environment"
 require "rails/test_help"
 require "minitest-spec-rails"