Update invalid $TERM test case

test/test_go.rb

@@ -1081,7 +1081,7 @@ class TestGoFZF < TestBase
   end
 
   def test_invalid_term
-    lines = `TERM=xxx #{FZF}`
+    lines = `TERM=xxx #{FZF} 2>&1`
     assert_equal 2, $?.exitstatus
     assert lines.include?('Invalid $TERM: xxx') || lines.include?('terminal entry not found')
   end