objectutilstests.java

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		int expected = 31 * 7 + 'a';
		expected = 31 * expected + 'E';

		char[] array = {'a', 'E'};
		int actual = ObjectUtils.nullSafeHashCode(array);

		assertEquals(expected, actual);
	}

	public void testNullSafeHashCodeWithCharArrayEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((char[]) null));
	}

	public void testNullSafeHashCodeWithDoubleArray() {
		long bits = Double.doubleToLongBits(8449.65);
		int expected = 31 * 7 + (int) (bits ^ (bits >>> 32));
		bits = Double.doubleToLongBits(9944.923);
		expected = 31 * expected + (int) (bits ^ (bits >>> 32));

		double[] array = {8449.65, 9944.923};
		int actual = ObjectUtils.nullSafeHashCode(array);

		assertEquals(expected, actual);
	}

	public void testNullSafeHashCodeWithDoubleArrayEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((double[]) null));
	}

	public void testNullSafeHashCodeWithFloatArray() {
		int expected = 31 * 7 + Float.floatToIntBits(9.6f);
		expected = 31 * expected + Float.floatToIntBits(7.4f);

		float[] array = {9.6f, 7.4f};
		int actual = ObjectUtils.nullSafeHashCode(array);

		assertEquals(expected, actual);
	}

	public void testNullSafeHashCodeWithFloatArrayEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((float[]) null));
	}

	public void testNullSafeHashCodeWithIntArray() {
		int expected = 31 * 7 + 884;
		expected = 31 * expected + 340;

		int[] array = {884, 340};
		int actual = ObjectUtils.nullSafeHashCode(array);

		assertEquals(expected, actual);
	}

	public void testNullSafeHashCodeWithIntArrayEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((int[]) null));
	}

	public void testNullSafeHashCodeWithLongArray() {
		long lng = 7993l;
		int expected = 31 * 7 + (int) (lng ^ (lng >>> 32));
		lng = 84320l;
		expected = 31 * expected + (int) (lng ^ (lng >>> 32));

		long[] array = {7993l, 84320l};
		int actual = ObjectUtils.nullSafeHashCode(array);

		assertEquals(expected, actual);
	}

	public void testNullSafeHashCodeWithLongArrayEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((long[]) null));
	}

	public void testNullSafeHashCodeWithObject() {
		String str = "Luke";
		assertEquals(str.hashCode(), ObjectUtils.nullSafeHashCode(str));
	}

	public void testNullSafeHashCodeWithObjectArray() {
		int expected = 31 * 7 + "Leia".hashCode();
		expected = 31 * expected + "Han".hashCode();

		Object[] array = {"Leia", "Han"};
		int actual = ObjectUtils.nullSafeHashCode(array);

		assertEquals(expected, actual);
	}

	public void testNullSafeHashCodeWithObjectArrayEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((Object[]) null));
	}

	public void testNullSafeHashCodeWithObjectBeingBooleanArray() {
		Object array = new boolean[] {true, false};
		int expected = ObjectUtils.nullSafeHashCode((boolean[]) array);
		assertEqualHashCodes(expected, array);
	}

	public void testNullSafeHashCodeWithObjectBeingByteArray() {
		Object array = new byte[] {6, 39};
		int expected = ObjectUtils.nullSafeHashCode((byte[]) array);
		assertEqualHashCodes(expected, array);
	}

	public void testNullSafeHashCodeWithObjectBeingCharArray() {
		Object array = new char[] {'l', 'M'};
		int expected = ObjectUtils.nullSafeHashCode((char[]) array);
		assertEqualHashCodes(expected, array);
	}

	public void testNullSafeHashCodeWithObjectBeingDoubleArray() {
		Object array = new double[] {68930.993, 9022.009};
		int expected = ObjectUtils.nullSafeHashCode((double[]) array);
		assertEqualHashCodes(expected, array);
	}

	public void testNullSafeHashCodeWithObjectBeingFloatArray() {
		Object array = new float[] {9.9f, 9.54f};
		int expected = ObjectUtils.nullSafeHashCode((float[]) array);
		assertEqualHashCodes(expected, array);
	}

	public void testNullSafeHashCodeWithObjectBeingIntArray() {
		Object array = new int[] {89, 32};
		int expected = ObjectUtils.nullSafeHashCode((int[]) array);
		assertEqualHashCodes(expected, array);
	}

	public void testNullSafeHashCodeWithObjectBeingLongArray() {
		Object array = new long[] {4389, 320};
		int expected = ObjectUtils.nullSafeHashCode((long[]) array);
		assertEqualHashCodes(expected, array);
	}

	public void testNullSafeHashCodeWithObjectBeingObjectArray() {
		Object array = new Object[] {"Luke", "Anakin"};
		int expected = ObjectUtils.nullSafeHashCode((Object[]) array);
		assertEqualHashCodes(expected, array);
	}

	public void testNullSafeHashCodeWithObjectBeingShortArray() {
		Object array = new short[] {5, 3};
		int expected = ObjectUtils.nullSafeHashCode((short[]) array);
		assertEqualHashCodes(expected, array);
	}

	public void testNullSafeHashCodeWithObjectEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((Object) null));
	}

	public void testNullSafeHashCodeWithShortArray() {
		int expected = 31 * 7 + 70;
		expected = 31 * expected + 8;

		short[] array = {70, 8};
		int actual = ObjectUtils.nullSafeHashCode(array);

		assertEquals(expected, actual);
	}

	public void testNullSafeHashCodeWithShortArrayEqualToNull() {
		assertEquals(0, ObjectUtils.nullSafeHashCode((short[]) null));
	}

	public void testNullSafeToStringWithBooleanArray() {
		boolean[] array = {true, false};
		assertEquals("{true, false}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithBooleanArrayBeingEmpty() {
		boolean[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithBooleanArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((boolean[]) null));
	}

	public void testNullSafeToStringWithByteArray() {
		byte[] array = {5, 8};
		assertEquals("{5, 8}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithByteArrayBeingEmpty() {
		byte[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithByteArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((byte[]) null));
	}

	public void testNullSafeToStringWithCharArray() {
		char[] array = {'A', 'B'};
		assertEquals("{'A', 'B'}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithCharArrayBeingEmpty() {
		char[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithCharArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((char[]) null));
	}

	public void testNullSafeToStringWithDoubleArray() {
		double[] array = {8594.93, 8594023.95};
		assertEquals("{8594.93, 8594023.95}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithDoubleArrayBeingEmpty() {
		double[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithDoubleArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((double[]) null));
	}

	public void testNullSafeToStringWithFloatArray() {
		float[] array = {8.6f, 43.8f};
		assertEquals("{8.6, 43.8}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithFloatArrayBeingEmpty() {
		float[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithFloatArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((float[]) null));
	}

	public void testNullSafeToStringWithIntArray() {
		int[] array = {9, 64};
		assertEquals("{9, 64}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithIntArrayBeingEmpty() {
		int[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithIntArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((int[]) null));
	}

	public void testNullSafeToStringWithLongArray() {
		long[] array = {434l, 23423l};
		assertEquals("{434, 23423}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithLongArrayBeingEmpty() {
		long[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithLongArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((long[]) null));
	}

	public void testNullSafeToStringWithPlainOldString() {
		assertEquals("I shoh love tha taste of mangoes", ObjectUtils.nullSafeToString("I shoh love tha taste of mangoes"));
	}

	public void testNullSafeToStringWithObjectArray() {
		Object[] array = {"Han", new Long(43)};
		assertEquals("{Han, 43}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithObjectArrayBeingEmpty() {
		Object[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithObjectArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((Object[]) null));
	}

	public void testNullSafeToStringWithShortArray() {
		short[] array = {7, 9};
		assertEquals("{7, 9}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithShortArrayBeingEmpty() {
		short[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithShortArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((short[]) null));
	}

	public void testNullSafeToStringWithStringArray() {
		String[] array = {"Luke", "Anakin"};
		assertEquals("{Luke, Anakin}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithStringArrayBeingEmpty() {
		String[] array = {};
		assertEquals("{}", ObjectUtils.nullSafeToString(array));
	}

	public void testNullSafeToStringWithStringArrayEqualToNull() {
		assertEquals("null", ObjectUtils.nullSafeToString((String[]) null));
	}

	private void assertEqualHashCodes(int expected, Object array) {
		int actual = ObjectUtils.nullSafeHashCode(array);
		assertEquals(expected, actual);
		assertTrue(array.hashCode() != actual);
	}

}