update

src/test/java/rocks/zipcode/quiz5/fundamentals/calculator/SquareRootTest.java

         Double actual = calculator.squareRoot(input);
 
         // then
-        Assert.assertEquals(expected, actual, 0);
+        Assert.assertEquals(expected, actual, 0.01);
     }
 }

src/test/java/rocks/zipcode/quiz5/fundamentals/calculator/SquareRootsTest.java

     @Test
     public void test3() {
         // given
-        test(new Double[]{12.0, 438.0, }, 144.0, 191844.0, 81.0);
+        test(new Double[]{12.0, 438.0, 9.0}, 144.0, 191844.0, 81.0);
     }
 
     @Test