In a class under test, if its constructor takes in an abstract class parameter can we mock it using mockito?
Ex
public abstract AbstractClass{
}
//Class under test
public class SourceClass{
SourceClass(AbstractClass abstractClass){}
}
@RunWith(MockitoJUnitRunner.class
public SourceClassTest{
@Mock
AbstractClass abstractClass;
}
whenever I do this i get this error
java.lang.ExceptionInInitializerError
Ther version of mockito I am using i 1.8.5
Well, this code below works fine, just tell me if I need to add some comments to explain what I wrote, ok? (hey, I am using Mockito 1.10.8):
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.runners.MockitoJUnitRunner;
abstract class AbstractClassToTest {
public abstract String doSomething();
}
class ConcreteClass {
private String something;
public ConcreteClass(AbstractClassToTest aClass){
this.something = aClass.doSomething();
}
public String getSomething(){
return this.something;
}
}
@RunWith(MockitoJUnitRunner.class)
public class TempTest {
@Mock
private AbstractClassToTest myClass;
@Test
public void canAbstractClassToTestBeMocked() {
String expectedResult = "hello world!";
Mockito
.when(myClass.doSomething())
.thenReturn(expectedResult);
String actualResult = myClass.doSomething();
Assert.assertEquals(expectedResult, actualResult);
}
@Test
public void canConcreteClassBeInstantiatedWithMock() {
String expectedResult = "hello world!";
Mockito
.when(myClass.doSomething())
.thenReturn(expectedResult);
ConcreteClass concrete = new ConcreteClass(myClass);
String actualResult = concrete.getSomething();
Assert.assertEquals(expectedResult, actualResult);
}
}
You cannot mock abstract classes, you have to mock a concrete one and pass that along. Just as regular code can't instantiate abstract classes.
