Prevent SquareDigit overflow crash

src/main/java/kyu7/SquareDigit.java

@@ -1,11 +1,10 @@
 package kyu7;
 
 
-import static common.SafeParse.parseInt;
-
-
 public class SquareDigit {
 
+    private static final String MAX_INT = Integer.toString(Integer.MAX_VALUE);
+
     //7 https://www.codewars.com/kata/546e2562b03326a88e000020/train/java
 
     public static int squareDigits(int n) {
@@ -16,7 +15,12 @@
             n /= 10;
             stringBuilder.insert(0, i * i);
         }
-        return parseInt(stringBuilder.toString());
+        String result = stringBuilder.toString();
+        if (result.length() > MAX_INT.length()
+                || result.length() == MAX_INT.length() && result.compareTo(MAX_INT) > 0) {
+            return Integer.MAX_VALUE;
+        }
+        return Integer.parseInt(result);
     }
 
 }

src/test/java/kyu7/SquareDigitTest.java

@@ -17,6 +17,16 @@
 import static kyu7.SquareDigit.*;
 @Tag("smoke")
 public class SquareDigitTest {
+    @Test
+    void squaresDigitsWhenResultFitsInAnInteger() {
+        assertEquals(811181, squareDigits(9119));
+    }
+
+    @Test
+    void capsResultsThatExceedIntegerRange() {
+        assertEquals(Integer.MAX_VALUE, squareDigits(99999));
+    }
+
     @Test
     void smokeTestsShouldExecuteApi() {
         quality.SmokeMethodTestHarness.verify(kyu7.SquareDigit.class);