Add SkipOutputStreamTest

util/src/test/java/dev/openrs2/util/io/SkipOutputStreamTest.kt

@@ -0,0 +1,51 @@
+package dev.openrs2.util.io
+
+import org.junit.jupiter.api.Assertions.assertArrayEquals
+import java.io.ByteArrayOutputStream
+import kotlin.test.Test
+
+object SkipOutputStreamTest {
+    @Test
+    fun testSkipBytes() {
+        for (n in 0..5) {
+            val expected = byteArrayOf(1, 2, 3, 4, 5).drop(n).toByteArray()
+
+            ByteArrayOutputStream().use { out ->
+                SkipOutputStream(out, n.toLong()).use { skip ->
+                    skip.write(1)
+                    skip.write(2)
+                    skip.write(3)
+                    skip.write(4)
+                    skip.write(5)
+                }
+
+                assertArrayEquals(expected, out.toByteArray())
+            }
+
+            ByteArrayOutputStream().use { out ->
+                SkipOutputStream(out, n.toLong()).use { skip ->
+                    skip.write(byteArrayOf(1, 2, 3, 4, 5))
+                }
+
+                assertArrayEquals(expected, out.toByteArray())
+            }
+
+            ByteArrayOutputStream().use { out ->
+                SkipOutputStream(out, n.toLong()).use { skip ->
+                    skip.write(byteArrayOf(1, 2, 3))
+                    skip.write(byteArrayOf(4, 5))
+                }
+
+                assertArrayEquals(expected, out.toByteArray())
+            }
+
+            ByteArrayOutputStream().use { out ->
+                SkipOutputStream(out, n.toLong()).use { skip ->
+                    skip.write(byteArrayOf(0, 1, 2, 3, 4, 5, 6), 1, 5)
+                }
+
+                assertArrayEquals(expected, out.toByteArray())
+            }
+        }
+    }
+}