Integration testing for spring cloud stream, how to ensure application resources are not used - spring-cloud

Question

I'm trying to do some integration testing for my cloud streaming application. One of the main issues I'm observing so far is that the TestChannelBinderConfiguration keeps picking up the configuration specified in src/main/java/resources/application.yml instead of keeping it as blank (since there is no config file in /src/test/resources/).
If I delete the application.yml file or remove all spring-cloud-stream related configuration, the test passes. How can I ensure that the TestChannelBinderConfiguration does not pick up application.yml file.
#Test
public void echoTransformTest() {
try (ConfigurableApplicationContext context =
new SpringApplicationBuilder(
TestChannelBinderConfiguration.getCompleteConfiguration(DataflowApplication.class))
.properties(new Properties())
.run("--spring.cloud.function.definition=echo")) {
InputDestination source = context.getBean(InputDestination.class);
OutputDestination target = context.getBean(OutputDestination.class);
GenericMessage<byte[]> inputMessage = new GenericMessage<>("hello".getBytes());
source.send(inputMessage);
assertThat(target.receive().getPayload()).isEqualTo("hello".getBytes());
}
}

Answer 1

I resolved this by doing the following:
SpringBootTest(properties = {"spring.cloud.stream.function.definition=reverse"})
#Import(TestChannelBinderConfiguration.class)
public class EchoTransformerTest {
#Autowired private InputDestination input;
#Autowired private OutputDestination output;
#Test
public void testTransformer() {
this.input.send(new GenericMessage<byte[]>("hello".getBytes()));
assertThat(output.receive().getPayload()).isEqualTo("olleh".getBytes());
}
}
and adding an application.yml to the test/resources this ensures that we don't read the src/resources application properties.
Another way was to explicitly define
#TestPropertySource(locations= "test.yml")