113: moar tests

src/main/java/io/jsonwebtoken/lang/Arrays.java

@@ -3,7 +3,11 @@ package io.jsonwebtoken.lang;
 /**
  * @since 0.6
  */
-public abstract class Arrays {
+public final class Arrays {
+
+    private static final Arrays INSTANCE = new Arrays();
+
+    private Arrays(){}
 
     public static int length(byte[] bytes) {
         return bytes != null ? bytes.length : 0;

src/test/groovy/io/jsonwebtoken/lang/ArraysTest.groovy

@@ -0,0 +1,24 @@
+package io.jsonwebtoken.lang
+
+import groovy.json.internal.Charsets
+import org.junit.Test
+import static org.junit.Assert.*
+
+class ArraysTest {
+
+    @Test
+    void testByteArrayLengthWithNull() {
+        assertEquals 0, Arrays.length(null)
+    }
+
+    @Test
+    void testByteArrayLengthWithEmpty() {
+        assertEquals 0, Arrays.length(new byte[0])
+    }
+
+    @Test
+    void testByteArrayLengthWithElements() {
+        byte[] bytes = "hello".getBytes(Charsets.UTF_8)
+        assertEquals 5, Arrays.length(bytes)
+    }
+}