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BAEL-9352: Mocking Object Properties With Mockito #18886

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BAEL-9352: Mocking Object Properties With Mockito #18886

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15 changes: 15 additions & 0 deletions ...mockito-4/src/main/java/com/baeldung/mockingobjectproperties/MockingObjectProperties.java
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package com.baeldung.mockingobjectproperties;

import javax.servlet.http.HttpServletRequest;

public class MockingObjectProperties {

public Object getSearchAttribute(HttpServletRequest request) {
return request.getAttribute("search");
}

public void printSearchAttribute(HttpServletRequest request) {
Object value = getSearchAttribute(request);
System.out.println("Search attribute: " + value);
}
}
43 changes: 43 additions & 0 deletions ...4/src/test/java/com/baeldung/mockingobjectproperties/MockingObjectPropertiesUnitTest.java
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package com.baeldung.mockingobjectproperties;

import static org.mockito.Mockito.*;
import static org.junit.jupiter.api.Assertions.*;

import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import org.junit.jupiter.api.Test;

public class MockingObjectPropertiesUnitTest {

@Test
void givenMockRequest_whenSimulatingDynamicAttributes_thenBehavesLikeRealObject() {
HttpServletRequest mockRequest = mock(HttpServletRequest.class);
Map<String, Object> attributes = new HashMap<>();

// Simulate internal state for getAttribute()
when(mockRequest.getAttribute(anyString()))
.thenAnswer(invocation -> attributes.get(invocation.getArgument(0)));

// Intercept setAttribute() calls to store values
doAnswer(invocation -> {
attributes.put(invocation.getArgument(0), invocation.getArgument(1));
return null;
}).when(mockRequest).setAttribute(anyString(), any());

// Use the main class
MockingObjectProperties helper = new MockingObjectProperties();

// Set and get attribute
mockRequest.setAttribute("search", "Mockito Example");
Object value = helper.getSearchAttribute(mockRequest);

// Assert the value is correctly retrieved
assertEquals("Mockito Example", value);

// Verify interactions
verify(mockRequest).setAttribute("search", "Mockito Example");
verify(mockRequest).getAttribute("search");
verify(mockRequest, never()).getAttribute("nonexistent");
}
}