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完全陌生的Mockito，這裏是我開始的：爲什麼這個Mockito測試失敗？
類在測試User.java：
package com.test.mockito;
public class User {
private ProductManager productManager;
public boolean buy(Product product, int quantity) throws InsufficientProductsException {
boolean transactionStatus=false;
int availableQuantity = productManager.getAvailableProducts(product);
if (quantity < availableQuantity) {
throw new InsufficientProductsException();
}
productManager.orderProduct(product, quantity);
transactionStatus=true;
return transactionStatus;
}
public void setProductManager(ProductManager productManager) {
this.productManager = productManager;
}
}
Mock對象：Product.java
package com.test.mockito;
public class Product {
}
ProductManager.java
package com.test.mockito;
public interface ProductManager {
int getAvailableProducts(Product product);
int orderProduct(Product product, int num);
}
異常類：InsufficientProductsException.ja va
package com.test.mockito;
public class InsufficientProductsException extends Exception {
private static final long serialVersionUID = 1L;
}
最後是測試代碼。
package com.test.mockito;
import org.junit.Before;
import org.junit.Test;
import static org.mockito.Mockito.*;
public class UserTest {
private User user;
private ProductManager productManager;
private Product product;
private int purchaseQuantity = 15;
@Before
public void setupMock() {
user = new User();
productManager = mock(ProductManager.class);
user.setProductManager(productManager);
product = mock(Product.class);
}
@Test(expected=InsufficientProductsException.class)
public void purchaseButInsufficientAvailableQuantity() throws InsufficientProductsException {
int availableQuantity = 3;
System.out.println("Train getAvailableProducts(product) to return " + availableQuantity);
when(productManager.getAvailableProducts(product)).thenReturn(availableQuantity);
try {
System.out.println("User.buy(" + purchaseQuantity + ") should fail with InsufficientProductsException");
user.buy(product,purchaseQuantity);
} catch (InsufficientProductsException e) {
System.out.println("InsufficientProductsException is thrown");
verify(productManager, times(0)).orderProduct(product, purchaseQuantity);
System.out.println("Verified orderProduct(product, " + purchaseQuantity + ") is not called");
throw e;
}
}
}
測試失敗，並且它顯示是因爲預期的InsufficientProductsException不是由用戶拋出。 Maven測試報告：
-------------------------------------------------------
T E S T S
-------------------------------------------------------
Running com.test.mockito.UserTest
Train getAvailableProducts(product) to return 3
User.buy(15) should fail with InsufficientProductsException
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 3.66 sec <<< FAILURE!
Results :
Failed tests: purchaseButInsufficientAvailableQuantity(com.test.mockito.UserTest): Expected exception: com.test.mockito.InsufficientProductsException
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0
這可能看起來很愚蠢，但真的無法通過我做錯了什麼。