/*******************************************************************************
 * Copyright (c) 2015-2018 Skymind, Inc.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Apache License, Version 2.0 which is available at
 * https://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 ******************************************************************************/

package org.deeplearning4j.util;

import org.deeplearning4j.BaseDL4JTest;
import org.junit.Test;
import org.nd4j.linalg.util.ArrayUtil;

import java.util.Arrays;

import static org.junit.Assert.assertEquals;

/**
 *
 */
public class ArrayUtilTest extends BaseDL4JTest {

    @Test
    public void testRange() {
        int[] range = ArrayUtil.range(0, 2);
        int[] test = {0, 1};
        assertEquals(true, Arrays.equals(test, range));

        int[] test2 = {-1, 0};
        int[] range2 = ArrayUtil.range(-1, 1);
        assertEquals(true, Arrays.equals(test2, range2));

    }

    @Test
    public void testStrides() {
        int[] shape = {5, 4, 3};
        int[] cStyleStride = {12, 3, 1};
        int[] fortranStyleStride = {1, 5, 20};
        int[] fortranStyleTest = ArrayUtil.calcStridesFortran(shape);
        int[] cStyleTest = ArrayUtil.calcStrides(shape);
        assertEquals(true, Arrays.equals(cStyleStride, cStyleTest));
        assertEquals(true, Arrays.equals(fortranStyleStride, fortranStyleTest));

        int[] shape2 = {2, 2};
        int[] cStyleStride2 = {2, 1};
        int[] fortranStyleStride2 = {1, 2};
        int[] cStyleTest2 = ArrayUtil.calcStrides(shape2);
        int[] fortranStyleTest2 = ArrayUtil.calcStridesFortran(shape2);
        assertEquals(true, Arrays.equals(cStyleStride2, cStyleTest2));
        assertEquals(true, Arrays.equals(fortranStyleStride2, fortranStyleTest2));



    }


}
