BAEL-7458: Add test for changing alias name in a keystore

core-java-modules/core-java-security-4/src/test/java/com/baeldung/keystorealias/KeystoreChangeCertificateNameAliasUnitTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.keystorealias;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.security.Key;
+import java.security.KeyStore;
+import java.security.cert.Certificate;
+
+import org.junit.jupiter.api.Test;
+
+public class KeystoreChangeCertificateNameAliasUnitTest {
+    private static final String KEYSTORE = "my-keystore.jks";
+    private static final String PWD = "storepw@1";
+    private static final String OLD_ALIAS = "baeldung";
+    private static final String NEW_ALIAS = "baeldung.com";
+
+    @Test
+    void whenAliasIsRenamed_thenNewAliasIsCreated() throws Exception {
+        KeyStore keystore = KeyStore.getInstance(KeyStore.getDefaultType());
+        keystore.load(getClass().getResourceAsStream(KEYSTORE), PWD.toCharArray());
+
+        assertThat(keystore.containsAlias(OLD_ALIAS)).isTrue();
+        assertThat(keystore.containsAlias(NEW_ALIAS)).isFalse();
+
+        Key key = keystore.getKey(OLD_ALIAS, PWD.toCharArray());
+        Certificate[] certificateChain = keystore.getCertificateChain(OLD_ALIAS);
+
+        keystore.deleteEntry(OLD_ALIAS);
+        keystore.setKeyEntry(NEW_ALIAS, key, PWD.toCharArray(), certificateChain);
+
+        assertThat(keystore.containsAlias(OLD_ALIAS)).isFalse();
+        assertThat(keystore.containsAlias(NEW_ALIAS)).isTrue();
+    }
+}