BAEL-4087: Inject a Map from a yaml file with Spring (#9560)

* Add server.yml

* Add MapFromYamlApplication.java

* Add YamlPropertySourceFactory.java

* Add ServerProperties.java

* Add MapFromYamlApplicationTests.java

* last commit

Co-authored-by: azhwani <>

spring-boot-modules/spring-boot-properties-2/src/test/java/com/baeldung/properties/yamlmap/MapFromYamlIntegrationTest.java

@@ -0,0 +1,43 @@
+package com.baeldung.properties.yamlmap;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import com.baeldung.properties.yamlmap.pojo.ServerProperties;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+class MapFromYamlIntegrationTest {
+
+    @Autowired
+    private ServerProperties serverProperties;
+
+    @Test
+    public void whenYamlFileProvidedThenInjectSimpleMap() {
+
+        assertThat(serverProperties.getApplication()).containsOnlyKeys("name", "url", "description");
+
+        assertThat(serverProperties.getApplication()
+            .get("name")).isEqualTo("InjectMapFromYAML");
+    }
+
+    @Test
+    public void whenYamlFileProvidedThenInjectComplexMap() {
+
+        assertThat(serverProperties.getConfig()).hasSize(2);
+
+        assertThat(serverProperties.getConfig()
+            .get("ips")
+            .get(0)).isEqualTo("10.10.10.10");
+
+        assertThat(serverProperties.getUsers()
+            .get("root")
+            .getUsername()).isEqualTo("root");
+    }
+
+}