add tests for the fixes in the qhelp, and fix an FP that appeared

ruby/ql/test/query-tests/security/cwe-601/UrlRedirect.rb

@@ -98,3 +98,40 @@ end
 Rails.routes.draw do
   get "/r9", to: "users#route9"
 end
+
+class DomainController < ActionController::Base
+  KNOWN_HOST = "example.org"
+  
+  def hello
+    begin
+      target_url = URI.parse(params[:url])
+ 
+      # Redirect if the URL is either relative or on a known good host
+      if !target_url.host || target_url.host == KNOWN_HOST
+        redirect_to target_url.to_s
+      else
+        redirect_to "/error.html" # Redirect to error page if the host is not known
+      end
+    rescue URI::InvalidURIError
+      # Handle the exception, for example, by redirecting to a safe page
+      redirect_to "/error.html"
+    end
+  end
+end
+
+class ConstController < ActionController::Base
+  VALID_REDIRECTS = [
+    "http://cwe.mitre.org/data/definitions/601.html",
+    "http://cwe.mitre.org/data/definitions/79.html"
+  ].freeze
+  
+  def hello
+    # GOOD: the request parameter is validated against a known list of URLs
+    target_url = params[:url]
+    if VALID_REDIRECTS.include?(target_url)
+      redirect_to target_url
+    else
+      redirect_to "/error.html"
+    end
+  end
+end