diff --git a/repos/os/recipes/raw/test-init/test-init.config b/repos/os/recipes/raw/test-init/test-init.config
index b33b5bc7c..c744cd9f9 100644
--- a/repos/os/recipes/raw/test-init/test-init.config
+++ b/repos/os/recipes/raw/test-init/test-init.config
@@ -1521,6 +1521,26 @@
 	<expect_log string="[init -> server] [dummy] started version 2"/>
 	<sleep ms="150"/>
 
+	<message string="test invalid affinity configuration warning"/>
+
+	<init_config version="affinity">
+		<parent-provides>
+			<service name="ROM"/>
+			<service name="CPU"/>
+			<service name="PD"/>
+			<service name="LOG"/>
+		</parent-provides>
+		<default caps="100"/>
+		<start name="affinity">
+			<affinity xpos="0"/>
+			<binary name="dummy"/>
+			<resource name="RAM" quantum="2M"/>
+			<config/>
+			<route> <any-service> <parent/> </any-service> </route>
+		</start>
+	</init_config>
+	<expect_warning string="[init] " colored="Warning: affinity-space configuration missing, but affinity defined for child: affinity"/>
+	<sleep ms="150"/>
 
 	<message string="test complete"/>
 
diff --git a/repos/os/src/test/init/main.cc b/repos/os/src/test/init/main.cc
index 488df11a4..c6a3f697e 100644
--- a/repos/os/src/test/init/main.cc
+++ b/repos/os/src/test/init/main.cc
@@ -250,6 +250,15 @@ struct Test::Main : Log_message_handler
 				_expect_log     = true;
 				return;
 			}
+			if (step.type() == "expect_warning") {
+				_expect_log_msg = _curr_step_xml().attribute_value("string", Log_message_handler::Message());
+				Log_message_handler::Message colored (_curr_step_xml().attribute_value("colored", Log_message_handler::Message()));
+				_expect_log_msg = Log_message_handler::Message(_expect_log_msg,
+				                                               "\033[34m",
+				                                               colored);
+				_expect_log     = true;
+				return;
+			}
 
 			if (step.type() == "expect_init_state") {
 				if (xml_matches(step, _init_state.xml())) {