如何在构造函数中为@value设置值以进行测试[duplicate]

Question

我有以下构造函数

// many other variables not relevant for this question
private final boolean ignore;

public Client(@Value("${a.error}") boolean ignore) {
    // setting many other variables not relevant for this question
    this.ignore = ignore;
}

测试时：

@Before
public void setUp() {
    client = new Client(true);
    //many other setups
}

// tests correctly fine cos I set the ignore to true
@Test
public void testing(){
    // someMethod uses the ignore value to do some actions and return true / false
    assertTrue(client.someMethod());
}

@Test
public void howToTestIgnoreSetToFalse(){
    // ? 
}

Answer 1

这里我可以建议3个解决方案：

1. 通过Spring使用ReflectionUtils

@Before
public void setUp() {
    client = new Client(true);
    // rest of initialization
}

@Test
public void testing(){
    assertTrue(client.someMethod());
}

@Test
public void howToTestIgnoreSetToFalse(){
    Field fieldIgnore = Client.class.getDeclaredField("ignore");
    ReflectionUtils.makeAccessible(fieldIgnore);
    ReflectionUtils.setField(fieldIgnore, client, false);

    assertFalse(client.someMethod());
}

@Test
public void howToTestIgnoreSetToFalse(){
    Field fieldIgnore = Client.class.getDeclaredField("ignore");
    // only the way of how you're initializing field is changed,
    // everything else is the same
    fieldIgnore.setAccessible(true);
    Field modifiersField = Field.class.getDeclaredField("modifiers");
    modifiersField.setAccessible(true);
    modifiersField.setInt(f, f.getModifiers() & ~Modifier.FINAL);
    fieldIgnore.set(client, false);

    assertFalse(client.someMethod());
}

// setup method doesn't required anymore

@Test
public void testing(){
    Client client = createClient(true);
    assertTrue(client.someMethod());
}

@Test
public void howToTestIgnoreSetToFalse(){
    Client client = createClient(false);
    assertTrue(client.someMethod());
}

// factory method to prepare mocked/initialized instance
private static Client createClient(boolean ignore) {
    Client client = new Client(ignore);
    // do common initialization
    // setup your mocks
    return client;  
}

希望有帮助！