Mocking up WifiManager for Android Unit Testing

Question

I\'m trying to implement some unit tests for a couple of classes that rely on WifiManager and the returned ScanResults. What I\'d like to do is be able to control the ScanR

Answer 1

You could try to create the ScanResult instances by using reflection to access the private constructors. The code might look something like this:

        try {
            Constructor 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();
        }

For other ways of testing, I most of times convert the information from instances like ScanResult and encapsulate only the information I need into my own objects. These I feed to the method doing the hard work. This makes testing easier as you can easily build these intermediate objects without relying on the real ScanResult objects.