Merge pull request #834 from sameira/master

Adding SHA-256 hashing impl and test classes

core-java/src/test/java/com/baeldung/hashing/SHA256HashingTest.java

@@ -0,0 +1,37 @@
+package com.baeldung.hashing;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+
+public class SHA256HashingTest {
+
+    private static String originalValue = "abc123";
+    private static String hashedValue =
+            "6ca13d52ca70c883e0f0bb101e425a89e8624de51db2d2392593af6a84118090";
+
+    @Test
+    public void testHashWithJavaMessageDigest() throws Exception {
+        final String currentHashedValue = SHA256Hashing.HashWithJavaMessageDigest(originalValue);
+        assertEquals(currentHashedValue, hashedValue);
+    }
+
+    @Test
+    public void testHashWithGuava() throws Exception {
+        final String currentHashedValue = SHA256Hashing.HashWithApacheCommons(originalValue);
+        assertEquals(currentHashedValue, hashedValue);
+    }
+
+    @Test
+    public void testHashWithApacheCommans() throws Exception {
+        final String currentHashedValue = SHA256Hashing.HashWithGuava(originalValue);
+        assertEquals(currentHashedValue, hashedValue);
+    }
+
+    @Test
+    public void testHashWithBouncyCastle() throws Exception {
+        final String currentHashedValue = SHA256Hashing.HashWithBouncyCastle(originalValue);
+        assertEquals(currentHashedValue, hashedValue);
+    }
+}