Add more readonly and mutable tests

Author: patrickfav

src/test/java/at/favre/lib/bytes/BytesByteOrderTest.java

@@ -123,5 +123,11 @@ public void toLong() throws Exception {
         assertNotEquals(b.byteOrder(ByteOrder.BIG_ENDIAN).toLong(), b.byteOrder(ByteOrder.LITTLE_ENDIAN).toLong());
     }
 
+    @Test
+    public void bigInteger() throws Exception {
+        Bytes b = Bytes.from(example_bytes_four);
+        assertNotEquals(b.byteOrder(ByteOrder.BIG_ENDIAN).bigInteger(), b.byteOrder(ByteOrder.LITTLE_ENDIAN).bigInteger());
+        assertEquals(b.byteOrder(ByteOrder.BIG_ENDIAN).bigInteger(), b.byteOrder(ByteOrder.LITTLE_ENDIAN).reverse().bigInteger());
+    }
 
 }

src/test/java/at/favre/lib/bytes/BytesMiscTest.java

@@ -24,6 +24,7 @@
 import org.junit.Test;
 
 import java.nio.ByteOrder;
+import java.nio.ReadOnlyBufferException;
 
 import static org.junit.Assert.*;
 
@@ -178,5 +179,12 @@ public void readOnly() throws Exception {
         assertFalse(Bytes.from(example_bytes_twentyfour).isReadOnly());
         assertTrue(Bytes.from(example_bytes_twentyfour).readOnly().isReadOnly());
         assertTrue(Bytes.from(example_bytes_twentyfour).readOnly().copy().isReadOnly());
+
+        assertArrayEquals(example_bytes_twentyfour, Bytes.from(example_bytes_twentyfour).readOnly().internalArray());
+        try {
+            Bytes.from(example_bytes_twentyfour).readOnly().array();
+            fail();
+        } catch (ReadOnlyBufferException e) {
+        }
     }
 }

src/test/java/at/favre/lib/bytes/MutableBytesABytesTest.java

@@ -100,4 +100,10 @@ public void secureWipeShouldThrowException() throws Exception {
         Bytes.wrap(new byte[0]).mutable().secureWipe(null);
     }
 
+    @Test
+    public void testIfGetSameInstance() throws Exception {
+        MutableBytes b = fromAndTest(example_bytes_seven).mutable();
+        assertSame(b, b.mutable());
+    }
+
 }