fix(csr): use return value for assertion in test_list_csrs (#967)

Removes dependency on parsing stdout from "list csrs" command

Signed-off-by: Ajit Dingankar <[email protected]>

Author: adingank-qualcomm

tools/ruby-gems/udb/lib/udb/cli.rb

@@ -272,9 +272,12 @@ def csrs
             gen_path_override: Pathname.new(options[:gen])
           )
         cfg_arch = resolver.cfg_arch_for(cfg_file.realpath)
+        count = 0
         cfg_arch.csrs.each do |csr|
           puts csr.name
+          count += 1
         end
+        count
       end
     end
   end

tools/ruby-gems/udb/test/test_cli.rb

@@ -65,13 +65,12 @@ def test_disasm
   end
 
   def test_list_csrs
-    out, err = capture_io do
-      run_cmd("list csrs")
-    end
-    assert_empty err
+    num_listed = run_cmd("list csrs")
+
     repo_top = Udb.repo_root
     num_csr_yaml_files = `find #{repo_top}/spec/std/isa/csr/ -name '*.yaml' | wc -l`.to_i
-    assert_equal num_csr_yaml_files, out.split.length
+
+    assert_equal num_csr_yaml_files, num_listed
   end
 
 end