extract report_host for clarity

Author: oreoshake

spec/lib/secure_headers/middleware_spec.rb

@@ -14,20 +14,21 @@ module SecureHeaders
     end
 
     it "warns if the hpkp report-uri host is the same as the current host" do
+      report_host = "report-uri.io"
       Configuration.default do |config|
         config.hpkp = {
           max_age: 10000000,
           pins: [
             {sha256: 'b5bb9d8014a0f9b1d61e21e796d78dccdf1352f23cd32812f4850b878ae4944c'},
             {sha256: '73a2c64f9545172c1195efb6616ca5f7afd1df6f245407cafb90de3998a1c97f'}
           ],
-          report_uri: 'https://report-uri.io/example-hpkp'
+          report_uri: "https://#{report_host}/example-hpkp"
         }
       end
 
       expect(Kernel).to receive(:warn).with(Middleware::HPKP_SAME_HOST_WARNING)
 
-      middleware.call(Rack::MockRequest.env_for("https://report-uri.io", {}))
+      middleware.call(Rack::MockRequest.env_for("https://#{report_host}", {}))
     end
 
     it "sets the headers" do