To access to a resources test in spring boot tests, you can use the following statement :

Paths.get(getClass().getResource(resourcePath).toURI());

You can also use the spring annotation TestPropertySource on your test class :

@RunWith(SpringRunner.class)
@TestPropertySource(locations = "resourcePath")
@SpringBootTest
public class InputConfigurationTest {
...
}

Warning : Be careful about the resourcePath variable : this variable must start with a "/". For example : resourcePath = "/config.properties"