BAEL-4200: JNDI - What Is java:comp/env? (#15081)

core-java-modules/core-java-jndi/src/test/java/com/baeldung/jndi/JndiNamingUnitTest.java

@@ -0,0 +1,72 @@
+package com.baeldung.jndi;
+
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.springframework.jdbc.datasource.DriverManagerDataSource;
+import org.springframework.jndi.JndiTemplate;
+import org.springframework.mock.jndi.SimpleNamingContextBuilder;
+
+import javax.naming.*;
+import javax.sql.DataSource;
+
+import java.util.Enumeration;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class JndiNamingUnitTest {
+
+    private static InitialContext context;
+    private static DriverManagerDataSource dataSource;
+
+    @BeforeAll
+    static void setUp() throws Exception {
+        SimpleNamingContextBuilder builder = new SimpleNamingContextBuilder();
+        dataSource = new DriverManagerDataSource("jdbc:h2:mem:mydb");
+        builder.activate();
+
+        JndiTemplate jndiTemplate = new JndiTemplate();
+        context = (InitialContext) jndiTemplate.getContext();
+        
+        dataSource.setDriverClassName("org.h2.Driver");
+        context.bind("java:comp/env/jdbc/datasource", dataSource);
+    }
+
+    @Test
+    void givenACompositeName_whenAddingAnElement_thenNameIsAdded() throws Exception {
+        Name objectName = new CompositeName("java:comp/env/jdbc");
+
+        Enumeration<String> items = objectName.getAll();
+        while(items.hasMoreElements()) {
+            System.out.println(items.nextElement());
+        }
+
+        objectName.add("New Name");
+
+        assertEquals("env", objectName.get(1));
+        assertEquals("New Name", objectName.get(objectName.size() - 1));
+    }
+
+    @Test
+    void givenContext_whenLookupByName_thenReturnsValidObject() throws Exception {
+        DataSource ds = (DataSource) context.lookup("java:comp/env/jdbc/datasource");
+
+        assertNotNull(ds);
+        assertNotNull(ds.getConnection());
+    }
+    
+    @Test
+    void givenSubContext_whenLookupByName_thenReturnsValidObject() throws Exception {
+        Context subContext = (Context) context.lookup("java:comp/env");
+        DataSource ds = (DataSource) subContext.lookup("jdbc/datasource");
+
+        assertNotNull(ds);
+        assertNotNull(ds.getConnection());
+    }
+    
+    @AfterAll
+    static void tearDown() throws Exception {
+       context.close();
+    }
+
+}