android - Injecting mock Retrofit API service instance into ActivityInstrumentTestCase2 -

android - Injecting mock Retrofit API service instance into ActivityInstrumentTestCase2 -

i'd write functional tests espresso activity using mock retrofit api service instance created mockrestadapter (https://github.com/square/retrofit/blob/master/retrofit-mock/src/main/java/retrofit/mockrestadapter.java).

this bit tricky though, can't ever inject dependencies via activity's constructor.

currently, single retrofit api service instance lives in application object, , create reference in each of activities' oncreate() methods.

how can swap in mock retrofit api service? perhaps dagger answer?

yes, dagger answer. on how accomplish this, recommend @ jake wharton's u2020 @ github. in nutshell, provide different api implementations production , debug flavors. or, have separate flavor integration tests.

another way solve without dagger (adding back upwards quite undertaking ongoing project), have flavor integration tests. e.g. have release, debug , mock flavors.

then have different application class set in android manifest mock flavor - implementation uses mock adapter. core thought here can override or augment main androidmanifest in flavors.

that'd this:

project structure

app/ src/ main/ androidmanifest.xml - activities, services, permissions - stuff goes here java/.../myapplication.java mock/ androidmanifest.xml - illustration below java/.../mockapplication.java debug/ - not relevant illustration release/ - not relevant illustration

main/androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" package="com.example.android" > <!-- permissions etc --> <application android:name=".myapplication" ... > <!-- activities, services etc --> </application> </manifest>

mock/androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"> <application android:name=".mockapplication"/> </manifest>

application.java

class="lang-java prettyprint-override">public class myapplication extends application { @override public void oncreate(bundle savedstate) { myapi api = createapiadapter(); } protected myapi createapiadapter() { // create regular retrofit adapter } }

mockapplication.java

class="lang-java prettyprint-override">public class mockapplication extends myapplication { @override protected myapi createapiadapter() { // create mock retrofit adapter } }

build.gradle

android { // ... buildtypes { mock { applicationidsuffix '.mock' versionnamesuffix '-mock' debuggable true } debug { applicationidsuffix '.dev' versionnamesuffix '-dev' debuggable true } release { signingconfig signingconfigs.release } } }

android functional-testing retrofit dagger android-espresso