implement tests

also fix MD5

src/commonTest/kotlin/com/infendro/hash/keccak/sha3/SHA3-256.kt

@@ -0,0 +1,34 @@
+package com.infendro.hash.keccak.sha3
+
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+import kotlin.test.assertEquals
+
+class `SHA3-256 Test` {
+    val function = `SHA3-256`
+
+    @Test
+    fun `bytes and block`() {
+        assertEquals(32, function.bytes)
+        assertEquals(256, function.bits)
+        assertEquals(136, function.block)
+    }
+
+    @Test
+    fun `empty bytearray`() {
+        val expected = ubyteArrayOf(
+            0xa7U, 0xffU, 0xc6U, 0xf8U,
+            0xbfU, 0x1eU, 0xd7U, 0x66U,
+            0x51U, 0xc1U, 0x47U, 0x56U,
+            0xa0U, 0x61U, 0xd6U, 0x62U,
+            0xf5U, 0x80U, 0xffU, 0x4dU,
+            0xe4U, 0x3bU, 0x49U, 0xfaU,
+            0x82U, 0xd8U, 0x0aU, 0x4bU,
+            0x80U, 0xf8U, 0x43U, 0x4aU,
+        )
+        val actual = function.hash(
+            ubyteArrayOf()
+        )
+        assertContentEquals(expected, actual)
+    }
+}