Add testing utilities and improve test coverage with FactoryBot integration

- Added `shoulda-matchers` for enhanced RSpec testing capabilities.
- Introduced `factory_bot_rails` for easier test data creation.
- Created factories for `HttpLogEntry`, `BlobEntry`, and `Domain::Fa::Post` models.
- Updated `rails_helper.rb` to include FactoryBot methods and configure Shoulda matchers.
- Enhanced `HttpLogEntry` model with a new `response_size` method.
- Refactored `justfile` to include parallel test execution.
- Improved `Gemfile` and `Gemfile.lock` with new testing gems.

test/controllers/domain/fa/users_controller_test.rb

@@ -3,6 +3,7 @@ require "test_helper"
 class Domain::Fa::UsersControllerTest < ActionDispatch::IntegrationTest
   setup do
     @user = TestUtil.build_fa_user
+    @user.registered_at = 1.year.ago
     @user.save!
   end
 

test/models/http_log_entry_test.rb

@@ -1,60 +0,0 @@
-require "test_helper"
-
-class HttpLogEntryTest < ActiveSupport::TestCase
-  def make_required_params
-    {
-      request_headers_id: TestUtil.create_http_headers.id,
-      response_headers_id: TestUtil.create_http_headers.id,
-      response_sha256: TestUtil.create_blob_entry.sha256,
-      response_time_ms: 125,
-      content_type: "test/text",
-      verb: :get,
-      requested_at: Time.now,
-      uri_scheme: "https",
-      uri_host: "example.com",
-      uri_path: "/foo/bar",
-      status_code: 200,
-      performed_by: "direct"
-    }
-  end
-
-  test "requires required params" do
-    model = ::HttpLogEntry.new(make_required_params)
-    assert model.valid?, model.errors.full_messages
-
-    make_required_params.keys.each do |target_key|
-      params_without_key = make_required_params
-      params_without_key.delete(target_key)
-      refute ::HttpLogEntry.new(params_without_key).valid?
-    end
-  end
-
-  test "uri is correct" do
-    uri_str =
-      "https://www.example.com/big/path/here?and=query&other=query2#smaz"
-    uri = Addressable::URI.parse(uri_str)
-    model = ::HttpLogEntry.new({ uri: uri_str })
-    assert_equal "https", model.uri_scheme
-    assert_equal "www.example.com", model.uri_host
-    assert_equal "/big/path/here", model.uri_path
-    assert_equal "and=query&other=query2", model.uri_query
-    assert_equal "smaz", model.uri_hash
-    assert_equal uri, model.uri
-    assert_equal uri_str, model.uri_str
-  end
-
-  test "model cannot be updated" do
-    model = ::HttpLogEntry.new(make_required_params)
-    model.save!
-    model.verb = :post
-    assert_raises(ActiveRecord::ReadOnlyRecord) { model.save! }
-    model.reload
-    assert_equal "get", model.verb
-  end
-
-  test "model cannot be deleted" do
-    model = ::HttpLogEntry.new(make_required_params)
-    model.save!
-    assert_raises(ActiveRecord::ReadOnlyRecord) { model.destroy }
-  end
-end