Android JUnit Parameters are String "null" instead of `null`

Question

I'm trying to run some new parameterized Android tests with null in the parameter set. Unfortunately, the values are showing up as the string "null" instead of null. How can I keep this from happening?

@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
    }

    ...
}

score 0 · Answer 1 · answered Oct 28 '16 at 15:44

I ended up initializing the parameters in a constructor and using a conditional check to set the fields to null when they are "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...*/

}

Android JUnit Parameters are String "null" instead of `null`

1 Answers1