static int runTestCase(int casenum__) {
		switch (casenum__) {
		case 0: {
			String num = "596";
			String expected__ = "569";

			return verifyCase(casenum__, expected__, new SwappingDigits().minNumber(num));
		}
		case 1: {
			String num = "93561";
			String expected__ = "13569";

			return verifyCase(casenum__, expected__, new SwappingDigits().minNumber(num));
		}
		case 2: {
			String num = "5491727514";
			String expected__ = "1491727554";

			return verifyCase(casenum__, expected__, new SwappingDigits().minNumber(num));
		}
		case 3: {
			String num = "10234";
			String expected__ = "10234";

			return verifyCase(casenum__, expected__, new SwappingDigits().minNumber(num));
		}
		case 4: {
			String num = "93218910471211292416";
			String expected__ = "13218910471211292496";

			return verifyCase(casenum__, expected__, new SwappingDigits().minNumber(num));
		}

		// custom cases

		/*
		 * case 5: {
		 * String num = ;
		 * String expected__ = ;
		 * 
		 * return verifyCase(casenum__, expected__, new
		 * SwappingDigits().minNumber(num));
		 * }
		 */
		/*
		 * case 6: {
		 * String num = ;
		 * String expected__ = ;
		 * 
		 * return verifyCase(casenum__, expected__, new
		 * SwappingDigits().minNumber(num));
		 * }
		 */
		/*
		 * case 7: {
		 * String num = ;
		 * String expected__ = ;
		 * 
		 * return verifyCase(casenum__, expected__, new
		 * SwappingDigits().minNumber(num));
		 * }
		 */
		default:
			return -1;
		}
	}