static int runTestCase(int casenum) {
		switch (casenum) {
		case 0: {
			int lower = 1;
			int upper = 10;
			int expected__ = 1;

			return verifyCase(casenum, expected__, new TheSimilarNumbers().find(lower, upper));
		}
		case 1: {
			int lower = 5;
			int upper = 511;
			int expected__ = 3;

			return verifyCase(casenum, expected__, new TheSimilarNumbers().find(lower, upper));
		}
		case 2: {
			int lower = 5;
			int upper = 4747;
			int expected__ = 3;

			return verifyCase(casenum, expected__, new TheSimilarNumbers().find(lower, upper));
		}
		case 3: {
			int lower = 1;
			int upper = 1000000;
			int expected__ = 6;

			return verifyCase(casenum, expected__, new TheSimilarNumbers().find(lower, upper));
		}
		case 4: {
			int lower = 10;
			int upper = 10110;
			int expected__ = 3;

			return verifyCase(casenum, expected__, new TheSimilarNumbers().find(lower, upper));
		}

		// custom cases

		/*
		 * case 5: {
		 * int lower = ;
		 * int upper = ;
		 * int expected__ = ;
		 *
		 * return verifyCase(casenum, expected__, new
		 * TheSimilarNumbers().find(lower, upper));
		 * }
		 */
		/*
		 * case 6: {
		 * int lower = ;
		 * int upper = ;
		 * int expected__ = ;
		 *
		 * return verifyCase(casenum, expected__, new
		 * TheSimilarNumbers().find(lower, upper));
		 * }
		 */
		/*
		 * case 7: {
		 * int lower = ;
		 * int upper = ;
		 * int expected__ = ;
		 *
		 * return verifyCase(casenum, expected__, new
		 * TheSimilarNumbers().find(lower, upper));
		 * }
		 */
		default:
			return -1;
		}
	}