robolectric VS JUnit

Robolectric

Do you use Robolectric to test string resolving?

@Config(instrumentedPackages = ["androidx.loader.content"]) is a workaround for https://github.com/robolectric/robolectric/issues/6593

There is also an issue with Robolectric which can be worked around by adding @Config(instrumentedPackages = ["androidx.loader.content"]) annotation to the test class.

If it's failing only on robo, this might be the cause: https://github.com/robolectric/robolectric/issues/6411

Unit tests. ~X0,000. These run on the jvm (not Android), via http://robolectric.org/

Take a look at http://robolectric.org. It has a specific JUnitRunner class for running unit tests in the test package with shadow classes for Android objects like application context. It is broadly used and there are a lot of examples on github and robolectric provides several themselves

Because I only wanna use the cmd java test, so I chose Junit4 which supports Plain-old JAR. I did test according to the Getting started document. But when I ran the javac -cp .:junit-4.XX.jar:hamcrest-core-1.3.jar CalculatorTest.java I got the error message CalculatorTest.java:4: error: package main does not exits. I tried to reorganize the folder and set Path according to others' experience 1, 2, but it still did not work.

Oops, another error. This is why we should read the manual 😅.

JUnit4

Delete those imports and remove the junit-jupiter-api dependency. Follow the instructions for JUnit 4.

Quite a lot of Java dependencies bring Junit 4 or Junit vintage engine as a transitive dependency.

The AHTest039.json file is the actual test. My testRunner() method (no relation to JUnit test runners) reads that JSON file, processes it, and asserts that the test passed. So my test class consists of a few Java methods, and what is essentially a list of JSON files to process.