Converting UnitTest to Instrumentation Test in android studio

Question

So I started with a UnitTest called MyCoolObjectTest. Needing to do some instrumentation testing, I moved the class right within the Android project view from the test directory to the androidTest directory by dragging. My UnitTest used to work fine; except for the instrumentation portions. But now it does not work at all. I keep getting

Class not found: "com.mypkg.MyCoolObjectTest"Empty test suite.

I have been looking all over stackOverflow and at the official docs for a solution. No luck so far. Has anyone experienced something similar?

(if I drag it back to the test folder it works; if I re-drag to the androidTest folder it stops working again)

I remember the was a way to set the folder under test. But I no longer remember.

For some insight, I want to use some android library in my test such as

public String stripFormatting(String input){
    return Html.fromHtml(input).toString();
}

That's why I need instrumentation.

Here is my unit test class with one test for an example:

@RunWith(AndroidJUnit4.class)
public class MyCoolObjectTest {
    @Test
    public void testJustToKnow() {
        String actual = "<b>0</b>";
        String expected = "0";
        assertThat(stripFormatting(actual), equalTo(expected));
    }
    public String stripFormatting(String input) {
        return Html.fromHtml(input).toString();
    }
}

update

Here is a different trace that I got. If I click on the method instead of the class, I get the following trace:

Just now I clicked on the method instead of the whole class, and got the following trace:

11/04 13:51:16: Launching testJustToKnow() $ adb push /Users/me/StudioProjects/Myapp/app/build/outputs/apk/app-debug.apk /data/local/tmp/com.mypkg.myapp $ adb shell pm install -r "/data/local/tmp/com.mypkg.myapp" pkg: /data/local/tmp/com.mypkg.myapp Success

$ adb push /Users/me/StudioProjects/Myapp/app/build/outputs/apk/app-debug-androidTest-unaligned.apk /data/local/tmp/com.mypkg.Myapp.test $ adb shell pm install -r "/data/local/tmp/com.mypkg.myapp.test" pkg: /data/local/tmp/com.mypkg.myapp.test Success

Running tests

$ adb shell am instrument -w -r -e debug false -e class com.mypkg.myapp.utils.MyCoolObjectTest#testJustToKnow com.mypkg.myapp.test/android.test.InstrumentationTestRunner Client not ready yet..Test running started

junit.framework.AssertionFailedError: No tests found in com.mypkg.myapp.utils.MyCoolObjectTest at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191) at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176) at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:555) at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1959)

Tests ran to completion.

Can you post the test class ?

Shadab Ansari
– Shadab Ansari

2016-11-04 19:08:46 +00:00
Commented Nov 4, 2016 at 19:08 — Shadab Ansari
– Shadab Ansari, Commented Nov 4, 2016 at 19:08

murf · Accepted Answer · 2017-03-21 13:14:23Z

8

I just had the same problem. Here is how I solved it:

In Android Studio go to Run > Edit Configurations...
Under the heading Android JUnit, select your test and delete it (minus button)
Add a new test configuration (plus button) and select Android Instrumented Tests
Set the following options:
Module: app
Test: Class
Class: select or enter your class with the instrumentation tests here
Click OK

Everything should work now.

answered Mar 21, 2017 at 13:14

murf

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2 Comments

arekolek Over a year ago

In my case there was "step 0" where I had to close and reopen the project. In step 2, the configuration was under "unknown".

Sreehari Over a year ago

@murf This one worked. Its weird why Studio is not doing all these automatically... Unfortunately awful with these kinda issues... Thanks murf for pointing this out

Gaston Flores · Accepted Answer · 2016-11-04 21:38:41Z

1

Maybe this will be useful:

src/test: only for unit test (nothing that involve android framework).
src/androidTest: for android instrumentation tests.

Please see here a better explanation for this.

Example of instrumentation test (Please check your annotations, for example @RunWith(AndroidJUnit4.class) or @SmallTest or @Test)

I hope this will be useful for you.

(update)

Maybe you forgot this on your gradle (in the main module):

android {
    defaultConfig {
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
}

If you has using Espresso, you must add a dependency (Please check the link above this "...Example of instrumentation test...")

edited Nov 4, 2016 at 21:38

answered Nov 4, 2016 at 18:33

Gaston Flores

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1 Comment

IgorGanapolsky Over a year ago

@RunWith(AndroidJUnit4.class) is not necessary

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