implement tests

also fix MD5

src/commonTest/kotlin/com/infendro/hash/sha1/SHA1.kt

@@ -0,0 +1,31 @@
+package com.infendro.hash.sha1
+
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+import kotlin.test.assertEquals
+
+class `SHA1 Test` {
+    val function = SHA1
+
+    @Test
+    fun `bytes and block`() {
+        assertEquals(20, function.bytes)
+        assertEquals(160, function.bits)
+        assertEquals(64, function.block)
+    }
+
+    @Test
+    fun `empty bytearray`() {
+        val expected = ubyteArrayOf(
+            0xdaU, 0x39U, 0xa3U, 0xeeU,
+            0x5eU, 0x6bU, 0x4bU, 0x0dU,
+            0x32U, 0x55U, 0xbfU, 0xefU,
+            0x95U, 0x60U, 0x18U, 0x90U,
+            0xafU, 0xd8U, 0x07U, 0x09U,
+        )
+        val actual = function.hash(
+            ubyteArrayOf()
+        )
+        assertContentEquals(expected, actual)
+    }
+}