[BAEL-6694] Secure Kubernetes Secrets with Vault (#14762)

* [BAEL-4849] Article code

* [BAEL-4968] Article code

* [BAEL-4968] Article code

* [BAEL-4968] Article code

* [BAEL-4968] Remove extra comments

* [BAEL-5258] Article Code

* [BAEL-2765] PKCE Support for Secret Clients

* [BAEL-5698] Article code

* [BAEL-5698] Article code

* [BAEL-5905] Initial code

* [BAEL-5905] Article code

* [BAEL-5905] Relocate article code to new module

* [BAEL-6275] PostgreSQL NOTIFY/LISTEN

* [BAEL-6275] Minor correction

* BAEL-6138

* [BAEL-6138] WIP - LiveTest

* [BAEL-6138] Tutorial Code

* [BAEL-6138] Tutorial Code

* [BAEL-6694] Article Code

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Co-authored-by: Philippe Sevestre <psevestre@gmail.com>

spring-vault/src/test/java/com/baeldung/springcloudvault/SpringCloudVaultApplicationLiveTest.java

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+package com.baeldung.springcloudvault;
+
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.core.env.Environment;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringRunner;
+
+@RunWith(SpringRunner.class)
+@ActiveProfiles("vault")
+@SpringBootTest(classes = SpringCloudVaultTestApplication.class)
+public class SpringCloudVaultApplicationLiveTest {
+
+    @Autowired
+    Environment env;
+
+    @Test
+    public void whenSpringContextIsBootstrapped_thenNoExceptions() {
+        assertNotNull(env.getProperty("foo"));
+    }
+
+}

spring-vault/src/test/resources/application-vault.properties

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+# Vault Properties
+spring.config.import: vault://
+spring.cloud.vault.uri=http://localhost:8200
+spring.cloud.vault.authentication=KUBERNETES
+spring.cloud.vault.kubernetes.role=baeldung-test-role
+
+#
+spring.cloud.vault.kv.backend=secrets
+spring.cloud.vault.kv.application-name=baeldung-test
+#
+
+# NOTICE: the following property is only necessary when running the application
+# outside Kubernetes
+# Please refer to the article for instructions on how to create this file
+spring.cloud.vault.kubernetes.service-account-token-file=sa-token.txt