simple parent-child test

spring-all/src/main/resources/child.properties

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+child.name=child

spring-all/src/main/resources/parent.properties

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+parent.name=parent

spring-all/src/test/java/org/baeldung/properties/config/ChildConfig.java

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+package org.baeldung.properties.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+@Configuration
+@PropertySource("classpath:child.properties")
+public class ChildConfig {
+
+}

spring-all/src/test/java/org/baeldung/properties/config/ParentChildPropertiesTest.java

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+package org.baeldung.properties.config;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.core.env.Environment;
+import org.springframework.test.context.ContextConfiguration;
+import org.springframework.test.context.ContextHierarchy;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+import org.springframework.test.context.web.WebAppConfiguration;
+import org.springframework.web.context.WebApplicationContext;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@WebAppConfiguration
+@ContextHierarchy({ @ContextConfiguration(classes = ParentConfig.class), @ContextConfiguration(classes = ChildConfig.class) })
+public class ParentChildPropertiesTest {
+
+    @Autowired
+    private WebApplicationContext wac;
+
+    @Test
+    public void givenParentPropertySource_whenGetValue_thenCorrect() {
+        final Environment childEnv = wac.getEnvironment();
+        final Environment parentEnv = wac.getParent().getEnvironment();
+
+        assertEquals(parentEnv.getProperty("parent.name"), "parent");
+        assertNull(parentEnv.getProperty("child.name"));
+
+        assertEquals(childEnv.getProperty("parent.name"), "parent");
+        assertEquals(childEnv.getProperty("child.name"), "child");
+    }
+}

spring-all/src/test/java/org/baeldung/properties/config/ParentConfig.java

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+package org.baeldung.properties.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+@Configuration
+@PropertySource("classpath:parent.properties")
+public class ParentConfig {
+
+}