package info.frostfs.sdk;

import org.junit.jupiter.api.Test;

import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.jupiter.api.Assertions.assertThrows;

public class ArrayHelperTest {

    @Test
    void concatTest_success() {
        //Given
        var startBytes = new byte[]{1, 2, 3, 4, 5};
        var endBytes = new byte[]{6, 7, 8, 9};

        //When
        var result = ArrayHelper.concat(startBytes, endBytes);

        //Then
        assertThat(startBytes).hasSize(5);
        assertThat(endBytes).hasSize(4);
        assertThat(result).hasSize(9).startsWith(startBytes).endsWith(endBytes);
    }

    @Test
    void concatTest_endArrayIsEmpty() {
        //Given
        var startBytes = new byte[]{1, 2, 3, 4, 5};
        var endBytes = new byte[]{};

        //When
        var result = ArrayHelper.concat(startBytes, endBytes);

        //Then
        assertThat(startBytes).hasSize(5);
        assertThat(endBytes).hasSize(0);
        assertThat(result).hasSize(5).startsWith(startBytes);
    }

    @Test
    void concatTest_startArrayIsEmpty() {
        //Given
        var startBytes = new byte[]{};
        var endBytes = new byte[]{6, 7, 8, 9};

        //When
        var result = ArrayHelper.concat(startBytes, endBytes);

        //Then
        assertThat(startBytes).hasSize(0);
        assertThat(endBytes).hasSize(4);
        assertThat(result).hasSize(4).startsWith(endBytes);
    }

    @Test
    void concatTest_givenParamsIsNull() {
        //Given
        var startBytes = new byte[]{1, 2, 3, 4, 5};
        var endBytes = new byte[]{6, 7, 8, 9};

        //When + Then
        assertThrows(IllegalArgumentException.class, () -> ArrayHelper.concat(startBytes, null));
        assertThrows(IllegalArgumentException.class, () -> ArrayHelper.concat(null, endBytes));
        assertThrows(IllegalArgumentException.class, () -> ArrayHelper.concat(null, null));
    }
}