fix flakey test

tests/ruby/admin_spec.rb

@@ -71,15 +71,17 @@ describe "Admin" do
 
     context "client connects but issues no queries" do
       it "only affects cl_idle stats" do
+        admin_conn = PG::connect(processes.pgcat.admin_connection_string)
+
+        before_test = admin_conn.async_exec("SHOW POOLS")[0]["sv_idle"]
         connections = Array.new(20) { PG::connect(pgcat_conn_str) }
         sleep(1)
-        admin_conn = PG::connect(processes.pgcat.admin_connection_string)
         results = admin_conn.async_exec("SHOW POOLS")[0]
         %w[cl_active cl_waiting cl_cancel_req sv_active sv_used sv_tested sv_login maxwait].each do |s|
           raise StandardError, "Field #{s} was expected to be 0 but found to be #{results[s]}" if results[s] != "0"
         end
         expect(results["cl_idle"]).to eq("20")
-        expect(results["sv_idle"]).to eq("1")
+        expect(results["sv_idle"]).to eq(before_test)
 
         connections.map(&:close)
         sleep(1.1)
@@ -87,7 +89,7 @@ describe "Admin" do
         %w[cl_active cl_idle cl_waiting cl_cancel_req sv_active sv_used sv_tested sv_login maxwait].each do |s|
           raise StandardError, "Field #{s} was expected to be 0 but found to be #{results[s]}" if results[s] != "0"
         end
-        expect(results["sv_idle"]).to eq("1")
+        expect(results["sv_idle"]).to eq(before_test)
       end
     end