How to use mockito in ExchangeTestSupport - apache-camel

Question

I have camel route as below
public class MainRouteBuilder extends RouteBuilder {
#Autowired
private CcsRouteCommonProperties commonProps;
/**
* {#inheritDoc}
*/
#Override
public void configure() throws Exception {
}
}
I have written test using ExchangeTestSupport as below
public class MainRouteBuilderTest extends ExchangeTestSupport {
/**
* {#inheritDoc}
*/
#Override
public RoutesBuilder createRouteBuilder() throws Exception {
}
#Test
public void shouldProcess() throws Exception {
}
}
I am trying to mock CcsRouteCommonProperties something like below
#Mock
private CcsRouteCommonProperties commonProps;
How to mock the above field using mockito(#RunWith(MockitoJUnitRunner.class))

Answer 1

Direct answer to your question would be to Use #InjectMocks on MainRouteBuilder and let Mockito inject an #Mock or #Spy of CcsRouteCommonProperties. I hope this short guide shall explain it for you.
Solution would be something like
#RunWith(MockitoJUnitRunner.class)
public class MainRouteBuilderTest extends ExchangeTestSupport {
#Mock
CcsRouteCommonProperties commonProps;
#InjectMocks
MainRouteBuilder routeBuilder;
#Override
public RoutesBuilder createRouteBuilder() throws Exception {
return routeBuilder;
}
#Test
public void shouldProcess() throws Exception {
when(commonProps.getSomething()).thenReturn(new Something());
}
}
However, if I am in your place, I'd avoid #Autowired magic and use clearly stated dependencies using constructor injection.
Route Builder
public class MainRouteBuilder extends RouteBuilder {
private CcsRouteCommonProperties commonProps;
public MainRouteBuilder( CcsRouteCommonProperties commonProps) {
this.commonProps = commonProps;
}
/**
* {#inheritDoc}
*/
#Override
public void configure() throws Exception {
}
}
Test
#RunWith(MockitoJUnitRunner.class)
public class MainRouteBuilderTest extends ExchangeTestSupport {
#Mock
CcsRouteCommonProperties commonProps;
#Override
public RoutesBuilder createRouteBuilder() throws Exception {
return new MainRouteBuilder(commonProps);
}
#Test
public void shouldProcess() throws Exception {
}
}