implement tests

also fix MD5

src/commonTest/kotlin/com/infendro/hash/keccak/shake/SHAKE128.kt

@@ -0,0 +1,34 @@
+package com.infendro.hash.keccak.shake
+
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+import kotlin.test.assertEquals
+
+class `SHAKE128 Test` {
+    val function = SHAKE128(32)
+
+    @Test
+    fun `bytes and block`() {
+        assertEquals(32, function.bytes)
+        assertEquals(256, function.bits)
+        assertEquals(168, function.block)
+    }
+
+    @Test
+    fun `empty bytearray`() {
+        val expected = ubyteArrayOf(
+            0x7fU, 0x9cU, 0x2bU, 0xa4U,
+            0xe8U, 0x8fU, 0x82U, 0x7dU,
+            0x61U, 0x60U, 0x45U, 0x50U,
+            0x76U, 0x05U, 0x85U, 0x3eU,
+            0xd7U, 0x3bU, 0x80U, 0x93U,
+            0xf6U, 0xefU, 0xbcU, 0x88U,
+            0xebU, 0x1aU, 0x6eU, 0xacU,
+            0xfaU, 0x66U, 0xefU, 0x26U,
+        )
+        val actual = function.hash(
+            ubyteArrayOf()
+        )
+        assertContentEquals(expected, actual)
+    }
+}