regression tests for existing kinds of bad params currently handled okay

But in past versions of bl_range_limit i know from my own app resulted in uncaught exception 500s

spec/requests/bad_param_requests_spec.rb

@@ -0,0 +1,46 @@
+require 'spec_helper'
+
+describe CatalogController, type: :request do
+  let(:range_facet_field) { "pub_date_si" }
+
+  let(:parsed_body) { Nokogiri::HTML(response.body) }
+
+  describe "bad params should not produce uncaught exception when" do
+    it "bad root range" do
+      get "/catalog?range=bad"
+
+      expect(response.code).to eq("200")
+      expect(parsed_body.css("span.applied-filter")).not_to be_present
+    end
+
+    it "facet params are ill structured" do
+      get "/catalog?#{  {"f" => { range_facet_field => [{"=Library&q="=>""}] } }.to_param  }"
+
+      expect(response.code).to eq("200")
+      expect(parsed_body.css("span.applied-filter")).not_to be_present
+    end
+
+    it "newline in range facet does not interupt facet" do
+      get "/catalog?#{ {"range"=>{ range_facet_field => {"begin"=>"1588\n", "end"=>"2020\n"}}}.to_param }"
+
+      expect(response.code).to eq("200")
+      expect(parsed_body.css("span.applied-filter")).to be_present
+      expect(parsed_body.css("span.applied-filter").collect(&:text)).to include(/1588.*to.*2020/)
+    end
+
+    it "weird attack in range value is ignored" do
+      param_hash = {"range"=>{"year_facet_isim"=>{"begin"=>"1989',(;))#- --", "end"=>"1989',(;))#- --"}}}
+      get "/catalog?#{ param_hash.to_param  }"
+
+      expect(response.code).to eq("200")
+      expect(parsed_body.css("span.applied-filter")).not_to be_present
+    end
+
+    it "empty range param is ignored" do
+      get "/catalog?#{ { "range" => { "year_facet_isim" => nil } }.to_param }"
+
+      expect(response.code).to eq("200")
+      expect(parsed_body.css("span.applied-filter")).not_to be_present
+    end
+  end
+end