June 2018 Update

Task/Binary-strings/Java/binary-strings-2.java

@@ -0,0 +1,60 @@
+import static org.hamcrest.CoreMatchers.is;
+
+import java.nio.charset.StandardCharsets;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class MutableByteStringTest {
+
+    @Test
+    public void testReplaceEmpty() {
+        MutableByteString str = new MutableByteString("hello".getBytes(StandardCharsets.UTF_8));
+        str.replace(new byte[]{}, new byte[]{'-'});
+
+        Assert.assertThat(str.toStringUtf8(), is("-h-e-l-l-o-"));
+    }
+
+    @Test
+    public void testReplaceMultiple() {
+        MutableByteString str = new MutableByteString("hello".getBytes(StandardCharsets.UTF_8));
+        str.replace(new byte[]{'l'}, new byte[]{'1', '2', '3'});
+
+        Assert.assertThat(str.toStringUtf8(), is("he123123o"));
+    }
+
+    @Test
+    public void testToHexString() {
+        MutableByteString str = new MutableByteString("hello".getBytes(StandardCharsets.UTF_8));
+
+        Assert.assertThat(str.toHexString(), is("68656c6c6f"));
+    }
+
+    @Test
+    public void testAppend() {
+        MutableByteString str = new MutableByteString("hello".getBytes(StandardCharsets.UTF_8));
+        str.append((byte) ',');
+        str.append((byte) ' ');
+        str.append((byte) 'w');
+        str.append((byte) 'o');
+        str.append((byte) 'r');
+        str.append((byte) 'l');
+        str.append((byte) 'd');
+
+        Assert.assertThat(str.toStringUtf8(), is("hello, world"));
+    }
+    @Test
+    public void testSubstring() {
+        MutableByteString str = new MutableByteString("hello, world".getBytes(StandardCharsets.UTF_8));
+
+        Assert.assertThat(str.substring(0, 5).toStringUtf8(), is("hello"));
+        Assert.assertThat(str.substring(7, 12).toStringUtf8(), is("world"));
+    }
+
+    @Test
+    public void testRegionEquals() {
+        MutableByteString str = new MutableByteString("hello".getBytes(StandardCharsets.UTF_8));
+
+        Assert.assertThat(str.regionEquals(0, new MutableByteString(new byte[]{'h'}), 0, 1), is(true));
+        Assert.assertThat(str.regionEquals(0, new MutableByteString(new byte[]{'h'}), 0, 2), is(false));
+    }
+}