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public class TestArrayUtilities {

    public static void runAllTests() {
        testSumArray();
        testLargestElement();
        testContainsAZero();
        testFindIndexOf();
        testPrintArray();
    }

    private static void testSumArray() {
        int[] A = {5, 10, 15, 20, 25, 30, 35, 40, 45, 50};
        int expected = 275;
        int result = ArrayUtilities.sumArray(A);
        if (result != expected) {
            System.out.println("sumArray failed: expected " + expected + ", got " + result);
        }
    }

    private static void testLargestElement() {
        int[] A = {42, 7, 102, 18, 55, 99, 3, 87, 64, 28};
        int expected = 102;
        int result = ArrayUtilities.largestElement(A);
        if (result != expected) {
            System.out.println("largestElement failed: expected " + expected + ", got " + result);
        }
    }

    private static void testContainsAZero() {
        int[] A1 = {11, 22, 33, 0, 44, 55, 66, 77, 88, 99};
        int[] A2 = {9, 8, 7, 6, 5, 4, 3, 2, 1};
        if (!ArrayUtilities.containsAZero(A1)) {
            System.out.println("containsAZero failed: expected true for array with zero");
        }
        if (ArrayUtilities.containsAZero(A2)) {
            System.out.println("containsAZero failed: expected false for array without zero");
        }
    }

    private static void testFindIndexOf() {
        ArrayUtilities util = new ArrayUtilities();
        int[] A = {10, 80, 30, 100, 50, 60, 70, 20, 90, 40};

        int val = 70;
        int expected = 6;
        int result = util.findIndexOf(A, val);
        if (result != expected) {
            System.out.println("findIndexOf failed for " + val + ": expected " + expected + ", got " + result);
        }

        val = 999;
        expected = -1;
        result = util.findIndexOf(A, val);
        if (result != expected) {
            System.out.println("findIndexOf failed for " + val + ": expected " + expected + ", got " + result);
        }
    }

    private static void testPrintArray() {
        int[] A = {3, 6, 9, 12, 15, 18, 21, 24, 27, 30};
        System.out.println("Expected output:");
        System.out.println("3, 6, 9, 12, 15, 18, 21, 24, 27, 30");
        System.out.println("Actual output:   ");
        ArrayUtilities.printArray(A);
        System.out.println("(Visually check that commas and spacing match.)");
    }
}