Add NoopEncryptionService

src/main/java/io/github/rabobank/shadow_tool/NoopEncryptionService.java

@@ -0,0 +1,18 @@
+package io.github.rabobank.shadow_tool;
+
+/**
+ * A version of the Encryption Service that doesn't perform any encryption.
+ * This might be useful for simple use-case where encryption of differences is not required,
+ * for example with public data.
+ */
+class NoopEncryptionService implements EncryptionService {
+    public static final NoopEncryptionService INSTANCE = new NoopEncryptionService();
+
+    NoopEncryptionService() {
+    }
+
+    @Override
+    public String encrypt(final String value) {
+        return value;
+    }
+}

src/test/java/io/github/rabobank/shadow_tool/EncryptionServiceTest.java

@@ -45,7 +45,7 @@ void encryptAndDecrypt() throws Exception {
         final var cipherText = decryptCipher.doFinal(Base64.decode(encryptedDifferences));
         final var expectedUnencryptedResult = new String(cipherText, StandardCharsets.UTF_8);
 
-        assertEquals(expectedUnencryptedResult, plainDifferences);
+        assertEquals(plainDifferences, expectedUnencryptedResult);
     }
 
     @Test

src/test/java/io/github/rabobank/shadow_tool/NoopEncryptionServiceTest.java

@@ -0,0 +1,19 @@
+package io.github.rabobank.shadow_tool;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class NoopEncryptionServiceTest {
+    @Test
+    void valuesAreNotEncrypted() {
+        final var encryptionService = NoopEncryptionService.INSTANCE;
+        final var plainDifferences = "'place' changed: 'Dintelooord' -> 'Dinteloord'\n" +
+                                     "'madrigals' collection changes :\n" +
+                                     "   1. 'Bruno' changed to 'Mirabel'\n" +
+                                     "   0. 'Bruno' added";
+        final var encryptedDifferences = encryptionService.encrypt(plainDifferences);
+
+        assertEquals(plainDifferences, encryptedDifferences);
+    }
+}