static int runTestCase(int casenum__) {
		switch (casenum__) {
		case 0: {
			int[] numbers = { 10, 7, 12, 8, 11 };
			int[] expected__ = { 9 };

			return verifyCase(casenum__, expected__,
					new ConsecutiveNumbers().missingNumber(numbers));
		}
		case 1: {
			int[] numbers = { 3, 6 };
			int[] expected__ = {};

			return verifyCase(casenum__, expected__,
					new ConsecutiveNumbers().missingNumber(numbers));
		}
		case 2: {
			int[] numbers = { 5, 6, 7, 8 };
			int[] expected__ = { 4, 9 };

			return verifyCase(casenum__, expected__,
					new ConsecutiveNumbers().missingNumber(numbers));
		}
		case 3: {
			int[] numbers = { 1000000000 };
			int[] expected__ = { 999999999, 1000000001 };

			return verifyCase(casenum__, expected__,
					new ConsecutiveNumbers().missingNumber(numbers));
		}
		case 4: {
			int[] numbers = { 1, 6, 9, 3, 8, 12, 7, 4, 11, 5, 10 };
			int[] expected__ = { 2 };

			return verifyCase(casenum__, expected__,
					new ConsecutiveNumbers().missingNumber(numbers));
		}
		case 5: {
			int[] numbers = { 1 };
			int[] expected__ = { 2 };

			return verifyCase(casenum__, expected__,
					new ConsecutiveNumbers().missingNumber(numbers));
		}

		// custom cases

		/*
		 * case 6: { int[] numbers = ; int[] expected__ = ;
		 *
		 * return verifyCase(casenum__, expected__, new
		 * ConsecutiveNumbers().missingNumber(numbers)); }
		 */
		/*
		 * case 7: { int[] numbers = ; int[] expected__ = ;
		 *
		 * return verifyCase(casenum__, expected__, new
		 * ConsecutiveNumbers().missingNumber(numbers)); }
		 */
		/*
		 * case 8: { int[] numbers = ; int[] expected__ = ;
		 *
		 * return verifyCase(casenum__, expected__, new
		 * ConsecutiveNumbers().missingNumber(numbers)); }
		 */
		default:
			return -1;
		}
	}