Shadowing static fields

[Detrie]

Hi All,

Is it possible to shadow static fields. I would like to create a shadow of android.os.Build but I can't seem to make it work. This is what I tried

@Implements(Build.class)

public class ShadowBuild {

    public static final String CPU_ABI = "poo";
    public static final String CPU_ABI2 = "poo2";

    @RealObject
    private Build mBuild;
}

And then

@RunWith(RobolectricTestRunner.class)
@Config(manifest = TestConstants.MANIFEST_LOCATION,
        sdk = Build.VERSION_CODES.JELLY_BEAN_MR1,
        shadows = ShadowBuild.class)
public class TestClass {


    @Before
    public void setUp() throws IOException {
        System.out.println(Build.CPU_ABI);
        System.out.println(Build.CPU_ABI2);
}

[Michael Grafton]

I don't know if this is possible or not - Robolectric has a lot of reflection tools at it's disposal and it certainly knows how to re-write static final fields.

That being said, it is probably less hassle to simply wrap these config values in an Object that you can mock out easily during tests.

Mike

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[Tyler Schultz]

Perhaps a bit controversial, but you can do something like this:

http://stackoverflow.com/questions/3301635/change-private-static-final-field-using-java-reflection

[Christian Williams]

The problem here is that javac is allowed to inline any final primitive fields at compile time, so you likely won't have the opportunity to change it at runtime. Possibly more likely to work if you don't pass -O to javac?

(Hey Tyler and Mike!)

--X [typos courtesy of my iPhone]

[Michael Grafton]

Wow, it's like olden times!

[Aaron Simmons]

While I don't think you can override the static fields in Build, you can modify at where it gets is values-- these come from SystemProperties.  Robolectric has a ShadowSystemProperties (see here).

[Joe Bowbeer]

Something like the following works for me:

@Config(shadows=AmazonSystemProperties.class)
@Test
public void testMyDeviceMadeByAmazon() {
    assertTrue("Amazon".equals(android.os.Build.MANUFACTURER));
}

@Implements(className = "android.os.SystemProperties")
public static class AmazonSystemProperties extends ShadowSystemProperties {

    @Implementation
    @SuppressWarnings("unused")
    public static String get(String key, String def) {
        if ("ro.product.manufacturer".equals(key)) {
            return "Amazon";
        }
        return ShadowSystemProperties.get(key, def);
    }
}