diff --git a/tests.py b/tests.py
index ccbf216c5..51b00cbd4 100644
--- a/tests.py
+++ b/tests.py
@@ -2101,7 +2101,7 @@ def testConstantTimeStringCheck():
     end = time.time()
     avTime1 = ((end - start) * 1000000 / itterations)
 
-    # change characters and observe timing difference
+    # change a single character and observe timing difference
     start = time.time()
     for timingTest in range(itterations):
         constantTimeStringCheck('nnjfbefefbsnjsdnvbcueftqfeuqfbqefnjeniwufgy',
@@ -2112,6 +2112,17 @@ def testConstantTimeStringCheck():
     # time difference should be less than 10uS
     assert timeDiffMicroseconds < 10
 
+    # change multiple characters and observe timing difference
+    start = time.time()
+    for timingTest in range(itterations):
+        constantTimeStringCheck('nnjfbefefbsnjsdnvbcueftqfeuqfbqefnjeniwufgy',
+                                'ano1befffbsn7sd3vbluef6qseuqfpqeznjgni9bfgi')
+    end = time.time()
+    avTime2 = ((end - start) * 1000000 / itterations)
+    timeDiffMicroseconds = abs(avTime2 - avTime1)
+    # time difference should be less than 10uS
+    assert timeDiffMicroseconds < 10
+
 
 def runAllTests():
     print('Running tests...')