Android JUnit 参数是字符串"null"而不是"null"

Question

我正在尝试运行一些新的参数化Android测试，在参数集中为null。不幸的是，这些值显示为字符串"null"而不是null。我怎样才能不让这种事发生呢?

@RunWith(Parameterized.class)
public class PedigreeProviderTest {
    @Parameter()
    @SuppressWarnings("WeakerAccess")
    public String mVin;
    @Parameter(value = 1)
    @SuppressWarnings("WeakerAccess")
    public String mDap;
    @Parameter(value = 2)
    @SuppressWarnings("WeakerAccess")
    public int mAddress;
    @Parameter(value = 3)
    @SuppressWarnings("WeakerAccess")
    public int mBusId;
    @Parameters
    public static Collection<Object[]> parameters() {
        return Arrays.asList(new Object[][]{
                {null, null, 0x7F, 0},
                {"1FUYFXYB3XPA96364", null, 0x7F, 0},
                {"1HD4CAM30YK190948", "00D06948C67C", 0x7F, 0},
                {null, "00D06948C67C", 0x7F, 0},
        });
    }
    @Test
    public void testSomething(){
        "null".equals(mVin); //is true for parameter 0 and 3
        mVin == null; //is never the case
    }
    ...
}

Answer 1

我最终在构造函数中初始化参数并使用条件检查将字段设置为null，当它们"null"

@RunWith(Parameterized.class)
public class PedigreeProviderTest {
    private String mVin;
    private String mDap;
    private int mAddress;
    private int mBusId;
    @Parameters
    public static Iterable<Object[]> parameters() {
        return Arrays.asList(new Object[][]{
                {"1FUYFXYB3XPA96364", null, 0x7F, 0},
                {"1HD4CAM30YK190948", "00D06948C67C", 0x7F, 0},
                {null, "00D06948C67C", 0x7F, 0},
                {null, null, 0x7F, 0},
        });
    }
    public PedigreeProviderTest(String vin, String dap, int address, int busId) {
        mVin = "null".equals(vin) ? null : vin;
        mDap = "null".equals(dap) ? null : dap;
        mAddress = address;
        mBusId = busId;
    }
    /*tests...*/
}