Add ByteUtil tests

Author: xxlabaza

src/test/java/io/appulse/utils/BytesUtilTest.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2018 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.appulse.utils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+
+public class BytesUtilTest {
+
+  @Test
+  public void asBytes () {
+    assertThat(BytesUtil.asBytes('a'))
+        .isEqualTo(new byte[] { 0, 97 });
+
+    assertThat(BytesUtil.asBytes((byte) 1))
+        .isEqualTo(new byte[] { 1 });
+
+    assertThat(BytesUtil.asBytes((short) 300))
+        .isEqualTo(new byte[] { 1, 44 });
+
+    assertThat(BytesUtil.asBytes(40_000))
+        .isEqualTo(new byte[] { 0, 0, -100, 64 });
+
+    assertThat(BytesUtil.asBytes(100L))
+        .isEqualTo(new byte[] { 0, 0, 0, 0, 0, 0, 0, 100 });
+
+    assertThat(BytesUtil.asBytes(.5F))
+        .isEqualTo(new byte[] { 63, 0, 0, 0 });
+
+    assertThat(BytesUtil.asBytes(.3D))
+        .isEqualTo(new byte[] { 63, -45, 51, 51, 51, 51, 51, 51 });
+  }
+
+  @Test
+  public void concatenate () {
+    assertThat(BytesUtil.concatenate(new byte[] { 1 }, new byte[] { 2 }, new byte[] { 3 }))
+        .isEqualTo(new byte[] { 1, 2, 3 });
+  }
+
+  @Test
+  public void align () {
+    assertThat(BytesUtil.align(new byte[] { 1 }, 4))
+        .isEqualTo(new byte[] { 0, 0, 0, 1 });
+
+    assertThat(BytesUtil.align(new byte[] { 1, 2, 3, 4 }, 2))
+        .isEqualTo(new byte[] { 3, 4 });
+  }
+}