Mocking static classes

FhirServiceTest.java

@RunWith(PowerMockRunner.class)
@PrepareForTest(JS.class)
public class FhirServiceTest {

    private FhirService service;

    @Before
    public void setup() {
        GWTMockUtilities.disarm();
        this.service = new FhirServiceImpl();
    }

    @Test
    public void getPatientByName() {

        // mock all the static methods in a class called "Static"
        PowerMockito.mockStatic(JS.class);
        // use Mockito to set up your expectation
        Mockito.when(JS.get(any(JavaScriptObject.class), eq("PREVVY_FHIR_URL"))).thenReturn("http://fhir.develop.prevvy.co:9091/prevvy/");



        service.read(ResourceType.Patient, "2923c288-7f59-4b44-b980-fb584650f91a", new FhirService.ResourceCallback() {
            @Override
            public void onResource(Resource r) {
                System.out.println();
            }
        });
    }
}

pom.xml

<!-- Testing Frameworks -->
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
            <version>2.0.2-beta</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-api-mockito</artifactId>
            <version>1.6.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.powermock</groupId>
            <artifactId>powermock-module-junit4</artifactId>
            <version>1.6.2</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>