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The meaning of WifiManager for testing Android modules

I am trying to implement some unit tests for several classes that rely on WifiManager and returned by ScanResults. What I would like to do is to control the ScanResults, which I get to test various conditions.

Unfortunately, it was quite difficult for me to successfully merge WifiManager (although I suppose I can pass my design null references in my MockWifiManager). This will be my first problem, since I have a MockWifiManager that I can play with (even if it works!) I will need to successfully create my ScanResults test, which does not have an open constructor (suppose it was created by some factory somewhere- then).

Questions: With it, I can not expand my constructor?

Am I really doing all this wrong? I often ask questions about how to perform a specific task, but they are actually trying to solve another problem incorrectly, maybe what am I doing here?

I am very new to android, therefore, so that the layout of all this function will try to say the least.

Thanks for your details!

Edit: I get damn time by creating a MockWifiManager. The constructor for the wifi manager expects the IWifiManager to be a type that does not seem to exist in the Android SDK.

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3 answers

WifiManager. . , , . , , mockable API.

/ . .

, , . -, , . Google .

-, , SOLID. , , .

http://www.objectmentor.com/resources/articles/dip.pdf http://butunclebob.com/ArticleS.UncleBob.PrinciplesOfOod

+8

ScanResult, . :

        try {
            Constructor<ScanResult> ctor = ScanResult.class.getDeclaredConstructor(null);
            ctor.setAccessible(true);
            ScanResult sr = ctor.newInstance(null);
            sr.BSSID = "foo";
            sr.SSID = "bar";
            // etc... 
        } catch (SecurityException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalArgumentException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InstantiationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

, ScanResult, , , . , . , , ScanResult.

+2

ScanResult. .

- ScanResult ( , Parcelable), ( unit test):

@RunWith(RobolectricTestRunner.class)
@Config(manifest=Config.NONE)
public class MovingAverageQueueTests {
    @Test
    public void parcelTest() {
        Parcel parcel = Parcel.obtain();

        ScanResult sr = buildScanResult("01:02:03:04:05:06", 70);

        parcel.writeValue(sr);
        parcel.setDataPosition(0); // required after unmarshalling
        ScanResult clone = (ScanResult)parcel.readValue(ScanResult.class.getClassLoader());
        parcel.recycle();

        assertThat(clone.BSSID, is(equalTo(sr.BSSID)));
        assertThat(clone.level, is(equalTo(sr.level)));
        assertThat(clone, is(not(sameInstance(sr))));
    }

    private ScanResult buildScanResult(String mac, int level) {
        Constructor<ScanResult> ctor = null;
        ScanResult sr = null;

        try {
            ctor = ScanResult.class.getDeclaredConstructor(null);
            ctor.setAccessible(true);
            sr = ctor.newInstance(null);

            sr.BSSID = mac;
            sr.level = level;

        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        return sr;
    }
}

, :

@Test
public void buildVsClonePerformanceTest() {
    ScanResult sr = null;

    long start = System.nanoTime();
    for (int i = 0; i < 1000000; i++) {
        sr = buildScanResult("01:02:03:04:05:06", 70);
    }
    long elapsedNanos = System.nanoTime() - start;

    LOGGER.info("buildScanResult: " + elapsedNanos);

    start = System.nanoTime();
    for (int i = 0; i < 1000000; i++) {
        sr = cloneScanResult(sr);
    }
    elapsedNanos = System.nanoTime() - start;

    LOGGER.info("cloneScanResult: " + elapsedNanos);
}

:

Oct 26, 2016 3:25:19 PM com.example.neutrino.maze.MovingAverageQueueTests buildVsClonePerformanceTest INFO: buildScanResult: 202072179Oct 26, 2016 3:25:21 PM com.example.neutrino.maze.MovingAverageQueueTests buildVsClonePerformanceTest INFO: cloneScanResult: 2004391903

, 10 , . , , ... . 10K, 100! .

P.S. Parcel.obtain() parcel.recycle

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