Properties in RestController is not accessible and Null in Junit

Question

When i run my junit for Rest Controller class, properties in Rest controller is throwing Nullpointer exception. Below is my sample code. when i run the testFileStatus() method of TestingControllerTest calass, i am getting Nullpointer exception. Kindly help to resolve the issue. Any suggestion why i can't able to access the property even though it is available in test application.properties.

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@RestController
@CrossOrigin(origins = "*", allowedHeaders = "*")
public class TestingController {
    @Value("${file.dir.status}")
    private String fileDirectoryStatus;

    @GetMapping(value="/filedetails")
    public String getFileDetails(.....){
        if(fileDirectoryStatus.equalsIgnoreCase("true")) {         //NullpointerException in Junit test
        //code to process file
        }
    }
}

src/main/resources/application.properties:

file.dir.status=false

src/test/resources/application.properties:

file.dir.status=false

@SpringBootTest
@TestPropertySource(
locations = "classpath:resources/application.properties")
public class TestingControllerTest{
    @InjectMocks
    private TestingController testingController; 

    @Test
    public void testFileStatus() {
    String status=testingController.getFileDetails(...);
    }
}