static int runTestCase(int casenum__) {
		switch (casenum__) {
		case 0: {
			int[] a = { 2, 3, 5, 6, 1 };
			int expected__ = 22;

			return verifyCase(casenum__, expected__, new ColumnDiagramPerimeter().getPerimiter(a));
		}
		case 1: {
			int[] a = { 3, 2, 1 };
			int expected__ = 12;

			return verifyCase(casenum__, expected__, new ColumnDiagramPerimeter().getPerimiter(a));
		}
		case 2: {
			int[] a = { 2, 2 };
			int expected__ = 8;

			return verifyCase(casenum__, expected__, new ColumnDiagramPerimeter().getPerimiter(a));
		}
		case 3: {
			int[] a = { 1, 2, 1 };
			int expected__ = 10;

			return verifyCase(casenum__, expected__, new ColumnDiagramPerimeter().getPerimiter(a));
		}
		case 4: {
			int[] a = { 1, 2, 3 };
			int expected__ = 12;

			return verifyCase(casenum__, expected__, new ColumnDiagramPerimeter().getPerimiter(a));
		}

		// custom cases

		/*
		 * case 5: {
		 * int[] a = ;
		 * int expected__ = ;
		 *
		 * return verifyCase(casenum__, expected__, new
		 * ColumnDiagramPerimeter().getPerimiter(a));
		 * }
		 */
		/*
		 * case 6: {
		 * int[] a = ;
		 * int expected__ = ;
		 *
		 * return verifyCase(casenum__, expected__, new
		 * ColumnDiagramPerimeter().getPerimiter(a));
		 * }
		 */
		/*
		 * case 7: {
		 * int[] a = ;
		 * int expected__ = ;
		 *
		 * return verifyCase(casenum__, expected__, new
		 * ColumnDiagramPerimeter().getPerimiter(a));
		 * }
		 */
		default:
			return -1;
		}
	}