diff --git a/test/case.rb b/test/case.rb
index f44bf5e5..7a0703c6 100644
--- a/test/case.rb
+++ b/test/case.rb
@@ -75,9 +75,9 @@ def assert_debugfile(asset, ok)
       end
     end
 
-    def assert_exec(asset)
+    def assert_exec(asset, **opts)
       file = File.basename(asset, '.y')
-      ruby "-I#{LIB_DIR}", "#{@TAB_DIR}/#{file}"
+      ruby "-I#{LIB_DIR}", "-rracc/parser", "#{@TAB_DIR}/#{file}", **opts
     end
 
     def strip_version(source)
@@ -101,8 +101,12 @@ def racc(*arg, **opt)
       ruby "-I#{LIB_DIR}", "-S", RACC, *arg, **opt
     end
 
-    def ruby(*arg, **opt)
-      assert_ruby_status(["-C", @TEMP_DIR, *arg], **opt)
+    def ruby(*arg, quiet: false, **opt)
+      if quiet
+        assert_in_out_err(["-C", @TEMP_DIR, *arg], **opt)
+      else
+        assert_ruby_status(["-C", @TEMP_DIR, *arg], **opt)
+      end
     end
   end
 end
diff --git a/test/test_racc_command.rb b/test/test_racc_command.rb
index 5bfebf15..9d2b566b 100644
--- a/test/test_racc_command.rb
+++ b/test/test_racc_command.rb
@@ -45,7 +45,7 @@ def test_chk_y
     def test_echk_y
       assert_compile 'echk.y', '-E'
       assert_debugfile 'echk.y', []
-      assert_exec 'echk.y'
+      assert_exec 'echk.y', quiet: true
     end
 
     def test_err_y