static int runTestCase(int casenum__) {
		switch (casenum__) {
		case 0: {
			int a = 0;
			int b = 1;
			int c = 2;
			double expected__ = 0.0;

			return verifyCase(casenum__, expected__, new TheArithmeticProgression().minimumChange(a, b, c));
		}
		case 1: {
			int a = 0;
			int b = 2;
			int c = 1;
			double expected__ = 1.5;

			return verifyCase(casenum__, expected__, new TheArithmeticProgression().minimumChange(a, b, c));
		}
		case 2: {
			int a = 3;
			int b = 2;
			int c = 1;
			double expected__ = 0.0;

			return verifyCase(casenum__, expected__, new TheArithmeticProgression().minimumChange(a, b, c));
		}
		case 3: {
			int a = 4;
			int b = 4;
			int c = 8;
			double expected__ = 2.0;

			return verifyCase(casenum__, expected__, new TheArithmeticProgression().minimumChange(a, b, c));
		}

		// custom cases

		/*
		 * case 4: {
		 * int a = ;
		 * int b = ;
		 * int c = ;
		 * double expected__ = ;
		 *
		 * return verifyCase(casenum__, expected__, new
		 * TheArithmeticProgression().minimumChange(a, b, c));
		 * }
		 */
		/*
		 * case 5: {
		 * int a = ;
		 * int b = ;
		 * int c = ;
		 * double expected__ = ;
		 *
		 * return verifyCase(casenum__, expected__, new
		 * TheArithmeticProgression().minimumChange(a, b, c));
		 * }
		 */
		/*
		 * case 6: {
		 * int a = ;
		 * int b = ;
		 * int c = ;
		 * double expected__ = ;
		 *
		 * return verifyCase(casenum__, expected__, new
		 * TheArithmeticProgression().minimumChange(a, b, c));
		 * }
		 */
		default:
			return -1;
		}
	}