Fixed failing tests

Author: GaryHilares

include/RubberNumbers/RubberIntegers.hpp

@@ -11,6 +11,7 @@ namespace RubberNumbers {
  * @brief Represents the error caused by trying to divide by 0.
  */
 class RubberDivisionByZero : public std::runtime_error {
+public:
     /**
      * @brief Creates a new DivisionByZero error object.
      */

src/RubberNumbers/RubberIntegers.cpp

@@ -267,6 +267,9 @@ RubberNumbers::RubberInt& RubberNumbers::RubberInt::operator*=(const RubberInt&
 
 RubberNumbers::RubberInt RubberNumbers::RubberInt::operator/(const RubberInt& num2) const
 {
+    if (num2.toString() == "0") {
+        throw RubberDivisionByZero();
+    }
     const RubberInt dividend = this->abs();
     const RubberInt divisor = num2.abs();
     RubberInt remainder;