add some test case

plugins/src/test/java/org/tron/plugins/utils/ByteArrayTest.java

@@ -0,0 +1,44 @@
+package org.tron.plugins.utils;
+
+import lombok.extern.slf4j.Slf4j;
+import org.junit.Assert;
+import org.junit.Test;
+
+@Slf4j
+public class ByteArrayTest {
+
+  @Test
+  public void testToStrToInt() {
+    String test = "abc";
+    byte[] testBytes = test.getBytes();
+    Assert.assertEquals(test, ByteArray.toStr(testBytes));
+
+    int i = 5;
+    Assert.assertEquals(ByteArray.toInt(ByteArray.fromInt(i)), 5);
+  }
+
+  @Test
+  public void testFromHexString() {
+    Assert.assertArrayEquals(ByteArray.EMPTY_BYTE_ARRAY, ByteArray.fromHexString(null));
+
+    Assert.assertArrayEquals(ByteArray.fromHexString("12"), ByteArray.fromHexString("0x12"));
+
+    Assert.assertArrayEquals(ByteArray.fromHexString("0x2"), ByteArray.fromHexString("0x02"));
+  }
+
+  @Test
+  public void testCompareUnsigned() {
+    byte[] a = new byte[] {1, 2};
+    Assert.assertEquals(0, ByteArray.compareUnsigned(a, a));
+    Assert.assertEquals(-1, ByteArray.compareUnsigned(null, a));
+    Assert.assertEquals(1, ByteArray.compareUnsigned(a, null));
+
+    byte[] b = new byte[] {1, 3};
+    Assert.assertEquals(-1, ByteArray.compareUnsigned(a, b));
+    Assert.assertEquals(1, ByteArray.compareUnsigned(b, a));
+
+    byte[] c = new byte[] {1, 2, 3};
+    Assert.assertEquals(-1, ByteArray.compareUnsigned(a, c));
+    Assert.assertEquals(1, ByteArray.compareUnsigned(c, a));
+  }
+}