Register discovered config sources in QuarkusComponentTestExtension

test-framework/junit-component/pom.xml

@@ -63,6 +63,11 @@
             <artifactId>smallrye-common-annotation</artifactId>
         </dependency>
         <!-- Test dependencies -->
+        <dependency>
+            <groupId>io.smallrye.config</groupId>
+            <artifactId>smallrye-config-source-yaml</artifactId>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.jboss.logmanager</groupId>
             <artifactId>jboss-logmanager</artifactId>

test-framework/junit-component/src/main/java/io/quarkus/test/component/QuarkusComponentTestExtension.java

@@ -525,6 +525,7 @@ private void startContainer(ExtensionContext context, Lifecycle testInstanceLife
                 // We intentionally skip system properties and ENV variables by default
                 // See https://github.com/quarkusio/quarkus/issues/48899 for more details
                 .addPropertiesSources()
+                .addDiscoveredSources()
                 .withSources(
                         new QuarkusComponentTestConfigSource(configProperties,
                                 configuration.configSourceOrdinal));

test-framework/junit-component/src/test/java/io/quarkus/test/component/ApplicationYamlConfigSourceTest.java

@@ -0,0 +1,32 @@
+package io.quarkus.test.component;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import jakarta.inject.Inject;
+import jakarta.inject.Singleton;
+
+import org.eclipse.microprofile.config.inject.ConfigProperty;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+public class ApplicationYamlConfigSourceTest {
+
+    @RegisterExtension
+    static final QuarkusComponentTestExtension extension = QuarkusComponentTestExtension.builder()
+            .build();
+
+    @Inject
+    YamlComponent component;
+
+    @Test
+    public void testYamlConfig() {
+        assertEquals("from-yaml", component.yamlProperty);
+    }
+
+    @Singleton
+    public static class YamlComponent {
+
+        @ConfigProperty(name = "org.acme.yaml-property")
+        String yamlProperty;
+    }
+}

test-framework/junit-component/src/test/resources/application.yaml

@@ -0,0 +1,3 @@
+org:
+  acme:
+    yaml-property: from-yaml