added message digest module

quarkus-message-digest-service/src/test/java/ch/phoenixtechnologies/quarkus/commons/digest/MessageDigestServiceImplTest.java

@@ -0,0 +1,81 @@
+package ch.phoenixtechnologies.quarkus.commons.digest;
+
+import io.quarkus.test.junit.QuarkusTest;
+import jakarta.inject.Inject;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
+
+@QuarkusTest
+class MessageDigestServiceImplTest {
+
+    public static final String INPUT = "test";
+    public static final byte[] EXPECTED_SHA256_DIGEST = {-97, -122, -48, -127, -120, 76, 125, 101, -102, 47, -22, -96, -59, 90, -48, 21, -93, -65, 79, 27, 43, 11, -126, 44, -47, 93, 108, 21, -80, -16, 10, 8};
+
+    @Inject
+    MessageDigestServiceImpl service;
+
+    @Test
+    void getInstance() {
+        assertThat(service.getInstance())
+                .isInstanceOf(MessageDigest.class);
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"SHA-256", "SHA-512", "MD5"})
+    void getInstanceWithAlgorithm(String algorithm) {
+        assertThat(service.getInstance(algorithm))
+                .isInstanceOf(MessageDigest.class);
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"ADBC", "acvb", "null"})
+    void getInstanceWhenUnknownAlgorithm(String algorithm) {
+        assertThatThrownBy(() -> service.getInstance(algorithm))
+                .isInstanceOf(IllegalArgumentException.class)
+                .hasMessageContaining("Unknown algorithm: " + algorithm);
+    }
+
+    @Test
+    void getInstanceWhenAlgorithmIsNull() {
+        assertThatThrownBy(() -> service.getInstance(null))
+                .isInstanceOf(NullPointerException.class)
+                .hasMessageContaining("null algorithm name");
+    }
+
+    @Test
+    void digest() {
+        assertThat(service.digest(INPUT))
+                .as("Digest should match expected value")
+                .isEqualTo(EXPECTED_SHA256_DIGEST);
+    }
+
+    @Test
+    void digestWithCharset() {
+        assertThat(service.digest(INPUT, StandardCharsets.UTF_8))
+                .as("Digest should match expected value")
+                .isEqualTo(EXPECTED_SHA256_DIGEST);
+
+    }
+
+    @Test
+    void digestWithCharsetAndAlgorithm() {
+        assertThat(service.digest(INPUT, StandardCharsets.UTF_8, "SHA-256"))
+                .as("Digest should match expected value")
+                .isEqualTo(EXPECTED_SHA256_DIGEST);
+    }
+
+    @Test
+    void digestWithCharsetAndMessageDigestInstance() {
+        var messageDigest = service.getInstance();
+        assertThat(service.digest(INPUT, StandardCharsets.UTF_8, messageDigest))
+                .as("Digest should match expected value")
+                .isEqualTo(EXPECTED_SHA256_DIGEST);
+    }
+}