BAEL-4522: Convert Byte Array to its Numeric Representation (#11267)

* Convert Byte Array to its Numeric Representation

* Remove Redundant Getter Method

core-java-modules/core-java-arrays-convert/pom.xml

@@ -19,6 +19,11 @@
             <artifactId>guava</artifactId>
             <version>${guava.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
     </dependencies>
 
     <properties>

core-java-modules/core-java-arrays-convert/src/main/java/com/baeldung/array/conversions/ByteArrayToNumericRepresentation.java

@@ -0,0 +1,281 @@
+package com.baeldung.array.conversions;
+
+import com.google.common.primitives.Ints;
+import com.google.common.primitives.Longs;
+import org.apache.commons.lang3.ArrayUtils;
+import org.apache.commons.lang3.Conversion;
+
+import java.math.BigInteger;
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+
+class ByteArrayToNumericRepresentation {
+
+    static int convertByteArrayToIntUsingShiftOperator(byte[] bytes) {
+        int value = 0;
+        for (byte b : bytes) {
+            value = (value << 8) + (b & 0xFF);
+        }
+        return value;
+    }
+
+    static byte[] convertIntToByteArrayUsingShiftOperator(int value) {
+        byte[] bytes = new byte[Integer.BYTES];
+        int length = bytes.length;
+        for (int i = 0; i < length; i++) {
+            bytes[length - i - 1] = (byte) (value & 0xFF);
+            value >>= 8;
+        }
+        return bytes;
+    }
+
+    static long convertByteArrayToLongUsingShiftOperator(byte[] bytes) {
+        long value = 0;
+        for (byte b : bytes) {
+            value <<= 8;
+            value |= (b & 0xFF);
+        }
+        return value;
+    }
+
+    static byte[] convertLongToByteArrayUsingShiftOperator(long value) {
+        byte[] bytes = new byte[Long.BYTES];
+        int length = bytes.length;
+        for (int i = 0; i < length; i++) {
+            bytes[length - i - 1] = (byte) (value & 0xFF);
+            value >>= 8;
+        }
+        return bytes;
+    }
+
+    static float convertByteArrayToFloatUsingShiftOperator(byte[] bytes) {
+        // convert bytes to int
+        int intValue = 0;
+        for (byte b : bytes) {
+            intValue = (intValue << 8) + (b & 0xFF);
+        }
+
+        // convert int to float
+        return Float.intBitsToFloat(intValue);
+    }
+
+    static byte[] convertFloatToByteArrayUsingShiftOperator(float value) {
+        // convert float to int
+        int intValue = Float.floatToIntBits(value);
+
+        // convert int to bytes
+        byte[] bytes = new byte[Float.BYTES];
+        int length = bytes.length;
+        for (int i = 0; i < length; i++) {
+            bytes[length - i - 1] = (byte) (intValue & 0xFF);
+            intValue >>= 8;
+        }
+        return bytes;
+    }
+
+    static double convertingByteArrayToDoubleUsingShiftOperator(byte[] bytes) {
+        long longValue = 0;
+        for (byte b : bytes) {
+            longValue = (longValue << 8) + (b & 0xFF);
+        }
+
+        return Double.longBitsToDouble(longValue);
+    }
+
+    static byte[] convertDoubleToByteArrayUsingShiftOperator(double value) {
+        long longValue = Double.doubleToLongBits(value);
+
+        byte[] bytes = new byte[Double.BYTES];
+        int length = bytes.length;
+        for (int i = 0; i < length; i++) {
+            bytes[length - i - 1] = (byte) (longValue & 0xFF);
+            longValue >>= 8;
+        }
+        return bytes;
+    }
+
+    static int convertByteArrayToIntUsingByteBuffer(byte[] bytes) {
+        ByteBuffer buffer = ByteBuffer.allocate(Integer.BYTES);
+        buffer.put(bytes);
+        buffer.rewind();
+        return buffer.getInt();
+    }
+
+    static byte[] convertIntToByteArrayUsingByteBuffer(int value) {
+        ByteBuffer buffer = ByteBuffer.allocate(Integer.BYTES);
+        buffer.putInt(value);
+        buffer.rewind();
+        return buffer.array();
+    }
+
+    static long convertByteArrayToLongUsingByteBuffer(byte[] bytes) {
+        ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
+        buffer.put(bytes);
+        buffer.rewind();
+        return buffer.getLong();
+    }
+
+    static byte[] convertLongToByteArrayUsingByteBuffer(long value) {
+        ByteBuffer buffer = ByteBuffer.allocate(Long.BYTES);
+        buffer.putLong(value);
+        buffer.rewind();
+        return buffer.array();
+    }
+
+    static float convertByteArrayToFloatUsingByteBuffer(byte[] bytes) {
+        ByteBuffer buffer = ByteBuffer.allocate(Float.BYTES);
+        buffer.put(bytes);
+        buffer.rewind();
+        return buffer.getFloat();
+    }
+
+    static byte[] convertFloatToByteArrayUsingByteBuffer(float value) {
+        ByteBuffer buffer = ByteBuffer.allocate(Float.BYTES);
+        buffer.putFloat(value);
+        buffer.rewind();
+        return buffer.array();
+    }
+
+    static double convertByteArrayToDoubleUsingByteBuffer(byte[] bytes) {
+        ByteBuffer buffer = ByteBuffer.allocate(Double.BYTES);
+        buffer.put(bytes);
+        buffer.rewind();
+        return buffer.getDouble();
+    }
+
+    static byte[] convertDoubleToByteArrayUsingByteBuffer(double value) {
+        ByteBuffer buffer = ByteBuffer.allocate(Double.BYTES);
+        buffer.putDouble(value);
+        buffer.rewind();
+        return buffer.array();
+    }
+
+    static int convertByteArrayToIntUsingBigInteger(byte[] bytes) {
+        return new BigInteger(bytes).intValue();
+    }
+
+    static byte[] convertIntToByteArrayUsingBigInteger(int value) {
+        return BigInteger.valueOf(value).toByteArray();
+    }
+
+    static long convertByteArrayToLongUsingBigInteger(byte[] bytes) {
+        return new BigInteger(bytes).longValue();
+    }
+
+    static byte[] convertLongToByteArrayUsingBigInteger(long value) {
+        return BigInteger.valueOf(value).toByteArray();
+    }
+
+    static float convertByteArrayToFloatUsingBigInteger(byte[] bytes) {
+        int intValue = new BigInteger(bytes).intValue();
+        return Float.intBitsToFloat(intValue);
+    }
+
+    static byte[] convertFloatToByteArrayUsingBigInteger(float value) {
+        int intValue = Float.floatToIntBits(value);
+        return BigInteger.valueOf(intValue).toByteArray();
+    }
+
+    static double convertByteArrayToDoubleUsingBigInteger(byte[] bytes) {
+        long longValue = new BigInteger(bytes).longValue();
+        return Double.longBitsToDouble(longValue);
+    }
+
+    static byte[] convertDoubleToByteArrayUsingBigInteger(double value) {
+        long longValue = Double.doubleToLongBits(value);
+        return BigInteger.valueOf(longValue).toByteArray();
+    }
+
+    static int convertingByteArrayToIntUsingGuava(byte[] bytes) {
+        return Ints.fromByteArray(bytes);
+    }
+
+    static byte[] convertIntToByteArrayUsingGuava(int value) {
+        return Ints.toByteArray(value);
+    }
+
+    static long convertByteArrayToLongUsingGuava(byte[] bytes) {
+        return Longs.fromByteArray(bytes);
+    }
+
+    static byte[] convertLongToByteArrayUsingGuava(long value) {
+        return Longs.toByteArray(value);
+    }
+
+    static float convertByteArrayToFloatUsingGuava(byte[] bytes) {
+        int intValue = Ints.fromByteArray(bytes);
+        return Float.intBitsToFloat(intValue);
+    }
+
+    static byte[] convertFloatToByteArrayUsingGuava(float value) {
+        int intValue = Float.floatToIntBits(value);
+        return Ints.toByteArray(intValue);
+    }
+
+    static double convertByteArrayToDoubleUsingGuava(byte[] bytes) {
+        long longValue = Longs.fromByteArray(bytes);
+        return Double.longBitsToDouble(longValue);
+    }
+
+    static byte[] convertDoubleToByteArrayUsingGuava(double value) {
+        long longValue = Double.doubleToLongBits(value);
+        return Longs.toByteArray(longValue);
+    }
+
+    static int convertByteArrayToIntUsingCommonsLang(byte[] bytes) {
+        byte[] copyBytes = Arrays.copyOf(bytes, bytes.length);
+        ArrayUtils.reverse(copyBytes);
+        return Conversion.byteArrayToInt(copyBytes, 0, 0, 0, copyBytes.length);
+    }
+
+    static byte[] convertIntToByteArrayUsingCommonsLang(int value) {
+        byte[] bytes = new byte[Integer.BYTES];
+        Conversion.intToByteArray(value, 0, bytes, 0, bytes.length);
+        ArrayUtils.reverse(bytes);
+        return bytes;
+    }
+
+    static long convertByteArrayToLongUsingCommonsLang(byte[] bytes) {
+        byte[] copyBytes = Arrays.copyOf(bytes, bytes.length);
+        ArrayUtils.reverse(copyBytes);
+        return Conversion.byteArrayToLong(copyBytes, 0, 0, 0, copyBytes.length);
+    }
+
+    static byte[] convertLongToByteArrayUsingCommonsLang(long value) {
+        byte[] bytes = new byte[Long.BYTES];
+        Conversion.longToByteArray(value, 0, bytes, 0, bytes.length);
+        ArrayUtils.reverse(bytes);
+        return bytes;
+    }
+
+    static float convertByteArrayToFloatUsingCommonsLang(byte[] bytes) {
+        byte[] copyBytes = Arrays.copyOf(bytes, bytes.length);
+        ArrayUtils.reverse(copyBytes);
+        int intValue = Conversion.byteArrayToInt(copyBytes, 0, 0, 0, copyBytes.length);
+        return Float.intBitsToFloat(intValue);
+    }
+
+    static byte[] convertFloatToByteArrayUsingCommonsLang(float value) {
+        int intValue = Float.floatToIntBits(value);
+        byte[] bytes = new byte[Float.BYTES];
+        Conversion.intToByteArray(intValue, 0, bytes, 0, bytes.length);
+        ArrayUtils.reverse(bytes);
+        return bytes;
+    }
+
+    static double convertByteArrayToDoubleUsingCommonsLang(byte[] bytes) {
+        byte[] copyBytes = Arrays.copyOf(bytes, bytes.length);
+        ArrayUtils.reverse(copyBytes);
+        long longValue = Conversion.byteArrayToLong(copyBytes, 0, 0, 0, copyBytes.length);
+        return Double.longBitsToDouble(longValue);
+    }
+
+    static byte[] convertDoubleToByteArrayUsingCommonsLang(double value) {
+        long longValue = Double.doubleToLongBits(value);
+        byte[] bytes = new byte[Long.BYTES];
+        Conversion.longToByteArray(longValue, 0, bytes, 0, bytes.length);
+        ArrayUtils.reverse(bytes);
+        return bytes;
+    }
+
+}

core-java-modules/core-java-arrays-convert/src/test/java/com/baeldung/array/conversions/ByteArrayToNumericRepresentationUnitTest.java

@@ -0,0 +1,316 @@
+package com.baeldung.array.conversions;
+
+import org.junit.Test;
+
+import static com.baeldung.array.conversions.ByteArrayToNumericRepresentation.*;
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+public class ByteArrayToNumericRepresentationUnitTest {
+    private static final byte[] INT_BYTE_ARRAY = new byte[]{
+            (byte) 0xCA, (byte) 0xFE, (byte) 0xBA, (byte) 0xBE
+    };
+    private static final int INT_VALUE = 0xCAFEBABE;
+
+
+    private static final byte[] FLOAT_BYTE_ARRAY = new byte[]{
+            (byte) 0x40, (byte) 0x48, (byte) 0xF5, (byte) 0xC3
+    };
+    private static final float FLOAT_VALUE = 3.14F;
+
+
+    private static final byte[] LONG_BYTE_ARRAY = new byte[]{
+            (byte) 0x01, (byte) 0x23, (byte) 0x45, (byte) 0x67,
+            (byte) 0x89, (byte) 0xAB, (byte) 0xCD, (byte) 0xEF
+    };
+    private static final long LONG_VALUE = 0x0123456789ABCDEFL;
+
+
+    private static final byte[] DOUBLE_BYTE_ARRAY = new byte[]{
+            (byte) 0x3F, (byte) 0xE3, (byte) 0xC6, (byte) 0xA7,
+            (byte) 0xEF, (byte) 0x9D, (byte) 0xB2, (byte) 0x2D
+    };
+    private static final double DOUBLE_VALUE = 0.618D;
+
+
+    @Test
+    public void givenShiftOperator_whenConvertingByteArrayToInt_thenSuccess() {
+        int value = convertByteArrayToIntUsingShiftOperator(INT_BYTE_ARRAY);
+
+        assertEquals(INT_VALUE, value);
+    }
+
+    @Test
+    public void givenShiftOperator_whenConvertingIntToByteArray_thenSuccess() {
+        byte[] bytes = convertIntToByteArrayUsingShiftOperator(INT_VALUE);
+
+        assertArrayEquals(INT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenShiftOperator_whenConvertingByteArrayToLong_thenSuccess() {
+        long value = convertByteArrayToLongUsingShiftOperator(LONG_BYTE_ARRAY);
+
+        assertEquals(LONG_VALUE, value);
+    }
+
+    @Test
+    public void givenShiftOperator_whenConvertingLongToByteArray_thenSuccess() {
+        byte[] bytes = convertLongToByteArrayUsingShiftOperator(LONG_VALUE);
+
+        assertArrayEquals(LONG_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenShiftOperator_whenConvertingByteArrayToFloat_thenSuccess() {
+        float value = convertByteArrayToFloatUsingShiftOperator(FLOAT_BYTE_ARRAY);
+
+        assertEquals(Float.floatToIntBits(FLOAT_VALUE), Float.floatToIntBits(value));
+    }
+
+    @Test
+    public void givenShiftOperator_whenConvertingFloatToByteArray_thenSuccess() {
+        byte[] bytes = convertFloatToByteArrayUsingShiftOperator(FLOAT_VALUE);
+
+        assertArrayEquals(FLOAT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenShiftOperator_whenConvertingByteArrayToDouble_thenSuccess() {
+        double value = convertingByteArrayToDoubleUsingShiftOperator(DOUBLE_BYTE_ARRAY);
+
+        assertEquals(Double.doubleToLongBits(DOUBLE_VALUE), Double.doubleToLongBits(value));
+    }
+
+    @Test
+    public void givenShiftOperator_whenConvertingDoubleToByteArray_thenSuccess() {
+        byte[] bytes = convertDoubleToByteArrayUsingShiftOperator(DOUBLE_VALUE);
+
+        assertArrayEquals(DOUBLE_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenByteBuffer_whenConvertingByteArrayToInt_thenSuccess() {
+        int value = convertByteArrayToIntUsingByteBuffer(INT_BYTE_ARRAY);
+
+        assertEquals(INT_VALUE, value);
+    }
+
+    @Test
+    public void givenByteBuffer_whenConvertingIntToByteArray_thenSuccess() {
+        byte[] bytes = convertIntToByteArrayUsingByteBuffer(INT_VALUE);
+
+        assertArrayEquals(INT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenByteBuffer_whenConvertingByteArrayToLong_thenSuccess() {
+        long value = convertByteArrayToLongUsingByteBuffer(LONG_BYTE_ARRAY);
+
+        assertEquals(LONG_VALUE, value);
+    }
+
+    @Test
+    public void givenByteBuffer_whenConvertingLongToByteArray_thenSuccess() {
+        byte[] bytes = convertLongToByteArrayUsingByteBuffer(LONG_VALUE);
+
+        assertArrayEquals(LONG_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenByteBuffer_whenConvertingByteArrayToFloat_thenSuccess() {
+        float value = convertByteArrayToFloatUsingByteBuffer(FLOAT_BYTE_ARRAY);
+
+        assertEquals(Float.floatToIntBits(FLOAT_VALUE), Float.floatToIntBits(value));
+    }
+
+    @Test
+    public void givenByteBuffer_whenConvertingFloatToByteArray_thenSuccess() {
+        byte[] bytes = convertFloatToByteArrayUsingByteBuffer(FLOAT_VALUE);
+
+        assertArrayEquals(FLOAT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenByteBuffer_whenConvertingByteArrayToDouble_thenSuccess() {
+        double value = convertByteArrayToDoubleUsingByteBuffer(DOUBLE_BYTE_ARRAY);
+
+        assertEquals(Double.doubleToLongBits(DOUBLE_VALUE), Double.doubleToLongBits(value));
+    }
+
+    @Test
+    public void givenByteBuffer_whenConvertingDoubleToByteArray_thenSuccess() {
+        byte[] bytes = convertDoubleToByteArrayUsingByteBuffer(DOUBLE_VALUE);
+
+        assertArrayEquals(DOUBLE_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenBigInteger_whenConvertingByteArrayToInt_thenSuccess() {
+        int value = convertByteArrayToIntUsingBigInteger(INT_BYTE_ARRAY);
+
+        assertEquals(INT_VALUE, value);
+    }
+
+    @Test
+    public void givenBigInteger_whenConvertingIntToByteArray_thenSuccess() {
+        byte[] bytes = convertIntToByteArrayUsingBigInteger(INT_VALUE);
+
+        assertArrayEquals(INT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenBigInteger_whenConvertingByteArrayToLong_thenSuccess() {
+        long value = convertByteArrayToLongUsingBigInteger(LONG_BYTE_ARRAY);
+
+        assertEquals(LONG_VALUE, value);
+    }
+
+    @Test
+    public void givenBigInteger_whenConvertingLongToByteArray_thenSuccess() {
+        byte[] bytes = convertLongToByteArrayUsingBigInteger(LONG_VALUE);
+
+        assertArrayEquals(LONG_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenBigInteger_whenConvertingByteArrayToFloat_thenSuccess() {
+        float value = convertByteArrayToFloatUsingBigInteger(FLOAT_BYTE_ARRAY);
+
+        assertEquals(Float.floatToIntBits(FLOAT_VALUE), Float.floatToIntBits(value));
+    }
+
+    @Test
+    public void givenBigInteger_whenConvertingFloatToByteArray_thenSuccess() {
+        byte[] bytes = convertFloatToByteArrayUsingBigInteger(FLOAT_VALUE);
+
+        assertArrayEquals(FLOAT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenBigInteger_whenConvertingByteArrayToDouble_thenSuccess() {
+        double value = convertByteArrayToDoubleUsingBigInteger(DOUBLE_BYTE_ARRAY);
+
+        assertEquals(Double.doubleToLongBits(DOUBLE_VALUE), Double.doubleToLongBits(value));
+    }
+
+    @Test
+    public void givenBigInteger_whenConvertingDoubleToByteArray_thenSuccess() {
+        byte[] bytes = convertDoubleToByteArrayUsingBigInteger(DOUBLE_VALUE);
+
+        assertArrayEquals(DOUBLE_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenGuava_whenConvertingByteArrayToInt_thenSuccess() {
+        int value = convertingByteArrayToIntUsingGuava(INT_BYTE_ARRAY);
+
+        assertEquals(INT_VALUE, value);
+    }
+
+    @Test
+    public void givenGuava_whenConvertingIntToByteArray_thenSuccess() {
+        byte[] bytes = convertIntToByteArrayUsingGuava(INT_VALUE);
+
+        assertArrayEquals(INT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenGuava_whenConvertingByteArrayToLong_thenSuccess() {
+        long value = convertByteArrayToLongUsingGuava(LONG_BYTE_ARRAY);
+
+        assertEquals(LONG_VALUE, value);
+    }
+
+    @Test
+    public void givenGuava_whenConvertingLongToByteArray_thenSuccess() {
+        byte[] bytes = convertLongToByteArrayUsingGuava(LONG_VALUE);
+
+        assertArrayEquals(LONG_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenGuava_whenConvertingByteArrayToFloat_thenSuccess() {
+        float value = convertByteArrayToFloatUsingGuava(FLOAT_BYTE_ARRAY);
+
+        assertEquals(Float.floatToIntBits(FLOAT_VALUE), Float.floatToIntBits(value));
+    }
+
+    @Test
+    public void givenGuava_whenConvertingFloatToByteArray_thenSuccess() {
+        byte[] bytes = convertFloatToByteArrayUsingGuava(FLOAT_VALUE);
+
+        assertArrayEquals(FLOAT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenGuava_whenConvertingByteArrayToDouble_thenSuccess() {
+        double value = convertByteArrayToDoubleUsingGuava(DOUBLE_BYTE_ARRAY);
+
+        assertEquals(Double.doubleToLongBits(DOUBLE_VALUE), Double.doubleToLongBits(value));
+    }
+
+    @Test
+    public void givenGuava_whenConvertingDoubleToByteArray_thenSuccess() {
+        byte[] bytes = convertDoubleToByteArrayUsingGuava(DOUBLE_VALUE);
+
+        assertArrayEquals(DOUBLE_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenCommonsLang_whenConvertingByteArrayToInt_thenSuccess() {
+        int value = convertByteArrayToIntUsingCommonsLang(INT_BYTE_ARRAY);
+
+        assertEquals(INT_VALUE, value);
+    }
+
+    @Test
+    public void givenCommonsLang_whenConvertingIntToByteArray_thenSuccess() {
+        byte[] bytes = convertIntToByteArrayUsingCommonsLang(INT_VALUE);
+
+        assertArrayEquals(INT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenCommonsLang_whenConvertingByteArrayToLong_thenSuccess() {
+        long value = convertByteArrayToLongUsingCommonsLang(LONG_BYTE_ARRAY);
+
+        assertEquals(LONG_VALUE, value);
+    }
+
+    @Test
+    public void givenCommonsLang_whenConvertingLongToByteArray_thenSuccess() {
+        byte[] bytes = convertLongToByteArrayUsingCommonsLang(LONG_VALUE);
+
+        assertArrayEquals(LONG_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenCommonsLang_whenConvertingByteArrayToFloat_thenSuccess() {
+        float value = convertByteArrayToFloatUsingCommonsLang(FLOAT_BYTE_ARRAY);
+
+        assertEquals(Float.floatToIntBits(FLOAT_VALUE), Float.floatToIntBits(value));
+    }
+
+    @Test
+    public void givenCommonsLang_whenConvertingFloatToByteArray_thenSuccess() {
+        byte[] bytes = convertFloatToByteArrayUsingCommonsLang(FLOAT_VALUE);
+
+        assertArrayEquals(FLOAT_BYTE_ARRAY, bytes);
+    }
+
+    @Test
+    public void givenCommonsLang_whenConvertingByteArrayToDouble_thenSuccess() {
+        double value = convertByteArrayToDoubleUsingCommonsLang(DOUBLE_BYTE_ARRAY);
+
+        assertEquals(Double.doubleToLongBits(DOUBLE_VALUE), Double.doubleToLongBits(value));
+    }
+
+    @Test
+    public void givenCommonsLang_whenConvertingDoubleToByteArray_thenSuccess() {
+        byte[] bytes = convertDoubleToByteArrayUsingCommonsLang(DOUBLE_VALUE);
+
+        assertArrayEquals(DOUBLE_BYTE_ARRAY, bytes);
+    }
+
+}