Usually, we unit tests the logics. An interface is without implementation details. A interface is just a binding a contract, but still, we can use Mockito to mock the interface, and test it.
For example, given the following simple Setter and Getter Interface:
1 2 3 4 | interface GetAndSet { void setValue(String name); String getValue(); } |
interface GetAndSet {
void setValue(String name);
String getValue();
}We can test it like this – thanks to the Mockito mocking framework in Java. We use doAnswer method to intercept the invokation of a interface method i.e. setter, then at the time, we mock the getter.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | package com.helloacm; import lombok.val; import org.junit.jupiter.api.Test; import static org.junit.jupiter.api.Assertions.assertEquals; import static org.mockito.Mockito.*; interface GetAndSet { void setValue(String name); String getValue(); } public class ExampleTest { @Test public void test_simple_getter_setter_interface() { val instance = mock(GetAndSet.class); doAnswer(invocation -> { // or use invocation.getArgument(0); val name = (String)invocation.getArguments()[0]; when(instance.getValue()).thenReturn(name); return null; }).when(instance).setValue(anyString()); instance.setValue("HelloACM.com"); assertEquals("HelloACM.com", instance.getValue()); } } |
package com.helloacm;
import lombok.val;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Mockito.*;
interface GetAndSet {
void setValue(String name);
String getValue();
}
public class ExampleTest {
@Test
public void test_simple_getter_setter_interface() {
val instance = mock(GetAndSet.class);
doAnswer(invocation -> {
// or use invocation.getArgument(0);
val name = (String)invocation.getArguments()[0];
when(instance.getValue()).thenReturn(name);
return null;
}).when(instance).setValue(anyString());
instance.setValue("HelloACM.com");
assertEquals("HelloACM.com", instance.getValue());
}
}If the method we are mocking is not void – we can use when. For example:
1 2 3 | when(instance.getValue()).thenAnswer(innocation -> { return "Hello"; }); |
when(instance.getValue()).thenAnswer(innocation -> {
return "Hello";
});–EOF (The Ultimate Computing & Technology Blog) —
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