Index: gc_core/py/lang_core/tests_core.py
==================================================================
--- gc_core/py/lang_core/tests_core.py
+++ gc_core/py/lang_core/tests_core.py
@@ -110,11 +110,11 @@
                               "\n> to check: " + _fuckBackslashUTF8(sTextToCheck) + \
                               "\n  expected: " + sExceptedSuggs + \
                               "\n  found:    " + sFoundSuggs + \
                               "\n  errors:   \n" + sListErr)
                         nUnexpectedErrors += 1
-            print("Tests with expected errors:", nTestWithExpectedError, " and suggestions:", nTestWithExpectedErrorAndSugg, ":", str(nTestWithExpectedErrorAndSugg/nTestWithExpectedError*100), "%")
+            print("Tests with expected errors:", nTestWithExpectedError, " and suggestions:", nTestWithExpectedErrorAndSugg, ":{:.4}%".format(nTestWithExpectedErrorAndSugg/nTestWithExpectedError*100))
             if nUnexpectedErrors:
                 print("Unexpected errors:", nUnexpectedErrors)
         # untested rules
         aUntestedRules = set()
         for _, sOpt, sLineId, sRuleId in gc_engine.listRules():