Fix Certificate.of(…) factory method retaining the private key.

Closes gh-857

Author: mp911de

spring-vault-core/src/main/java/org/springframework/vault/support/CertificateBundle.java

@@ -95,7 +95,7 @@ public static CertificateBundle of(String serialNumber, String certificate, Stri
 		Assert.hasText(privateKey, "Private key must not be empty");
 
 		return new CertificateBundle(serialNumber, certificate, issuingCaCertificate,
-				Collections.singletonList(issuingCaCertificate), null, privateKey, null);
+				Collections.singletonList(issuingCaCertificate), privateKey, privateKey, null);
 	}
 
 	/**

spring-vault-core/src/test/java/org/springframework/vault/support/CertificateBundleUnitTests.java

@@ -15,6 +15,8 @@
  */
 package org.springframework.vault.support;
 
+import static org.assertj.core.api.Assertions.*;
+
 import java.io.IOException;
 import java.net.URL;
 import java.security.KeyFactory;
@@ -27,8 +29,6 @@
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.ValueSource;
 
-import static org.assertj.core.api.Assertions.*;
-
 /**
  * Unit tests for {@link CertificateBundle}.
  *
@@ -97,6 +97,18 @@ void invalidEcKeySpecShouldThrowException() {
 		assertThat(bundle.getPrivateKeySpec()).isNotNull();
 	}
 
+	@Test
+	void shouldReturnPrivateKey() {
+
+		String serialNumber = "aserialnumber";
+		String certificate = "certificate";
+		String caCertificate = "caCertificate";
+		String privateKey = "aprivatekey";
+
+		CertificateBundle bundle = CertificateBundle.of(serialNumber, certificate, caCertificate, privateKey);
+		assertThat(bundle.getPrivateKey()).isNotNull();
+	}
+
 	@Test
 	void getAsKeystore() throws Exception {
 
@@ -115,9 +127,9 @@ void getAsKeystore() throws Exception {
 	}
 
 	@ParameterizedTest
-	@ValueSource(strings = { "certificate-response-rsa-pem.json", "certificate-response-rsa-der.json",
+	@ValueSource(strings = {"certificate-response-rsa-pem.json", "certificate-response-rsa-der.json",
 			"certificate-response-rsa-pembundle.json", "certificate-response-ec-pem.json",
-			"certificate-response-ec-der.json", "certificate-response-ec-pembundle.json" })
+			"certificate-response-ec-der.json", "certificate-response-ec-pembundle.json"})
 	void createKeystore(String path) {
 
 		CertificateBundle bundle = loadCertificateBundle(path);
@@ -132,7 +144,7 @@ void createKeystore(String path) {
 	}
 
 	@ParameterizedTest
-	@ValueSource(strings = { "certificate-response-rsa-pem-pkcs8.json", "certificate-response-ec-pem-pkcs8.json" })
+	@ValueSource(strings = {"certificate-response-rsa-pem-pkcs8.json", "certificate-response-ec-pem-pkcs8.json"})
 	void shouldCreateKeystore(String path) {
 
 		CertificateBundle bundle = loadCertificateBundle(path);