From 436b5f108cd7f0f3a0c0bfb9f7137b4a2ec3b8a8 Mon Sep 17 00:00:00 2001
From: Leonardo Colman Lopes <dev@leonardo.colman.com.br>
Date: Thu, 21 Dec 2023 22:41:39 -0300
Subject: [PATCH] [KTLN-789] Add Samples (#725)

* [KTLN-789] Add Samples

* [KTLN-789] Add Samples

* [KTLN-789] Add Samples
---
 .../kotlin/com/baeldung/md5/Md5UnitTest.kt    | 40 +++++++++++++++++++
 .../src/test/resources/test_md5.txt           |  1 +
 2 files changed, 41 insertions(+)
 create mode 100644 core-kotlin-modules/core-kotlin-9/src/test/kotlin/com/baeldung/md5/Md5UnitTest.kt
 create mode 100644 core-kotlin-modules/core-kotlin-9/src/test/resources/test_md5.txt

diff --git a/core-kotlin-modules/core-kotlin-9/src/test/kotlin/com/baeldung/md5/Md5UnitTest.kt b/core-kotlin-modules/core-kotlin-9/src/test/kotlin/com/baeldung/md5/Md5UnitTest.kt
new file mode 100644
index 000000000..aa5a2c973
--- /dev/null
+++ b/core-kotlin-modules/core-kotlin-9/src/test/kotlin/com/baeldung/md5/Md5UnitTest.kt
@@ -0,0 +1,40 @@
+package com.baeldung.md5
+
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Test
+import java.io.File
+import java.security.MessageDigest
+
+class Md5UnitTest {
+    @Test
+    fun `Calling extension md5 should return a md5 hash`() {
+        val stringToBeHashed = "Hello, Baeldung!"
+        val expectedHash = "6469a4ea9e2753755f5120beb51587f8"
+        val calculatedHash = stringToBeHashed.md5()
+
+        assertEquals(expectedHash, calculatedHash)
+    }
+
+    @Test
+    fun `Calling extension md5 on a file should return a md5 hash`() {
+        val fileToBeHashed = File("src/test/resources/test_md5.txt")
+        val expectedHash = "ef948f943cdba8514ed5aab7592a904d"
+        val calculatedHash = fileToBeHashed.md5()
+
+        assertEquals(expectedHash, calculatedHash)
+    }
+}
+
+@OptIn(ExperimentalStdlibApi::class)
+fun String.md5(): String {
+    val md = MessageDigest.getInstance("MD5")
+    val digest = md.digest(this.toByteArray())
+    return digest.toHexString()
+}
+
+@OptIn(ExperimentalStdlibApi::class)
+fun File.md5(): String {
+    val md = MessageDigest.getInstance("MD5")
+    val digest = md.digest(this.readBytes())
+    return digest.toHexString()
+}
\ No newline at end of file
diff --git a/core-kotlin-modules/core-kotlin-9/src/test/resources/test_md5.txt b/core-kotlin-modules/core-kotlin-9/src/test/resources/test_md5.txt
new file mode 100644
index 000000000..8271922f9
--- /dev/null
+++ b/core-kotlin-modules/core-kotlin-9/src/test/resources/test_md5.txt
@@ -0,0 +1 @@
+Hello, Baeldung! I'm a file!
\ No newline at end of file