在 robolectric 测试中使用资产

Question

In my robolectric tests I am trying to read a file. Since this file contains just the test data I have put it in assets of the tests.

The directory structure looks like this.
src/main/assets/prod_data_file
src/test/assets/test_data_file

However when I try to read the file by getShadowApplication().getAssets().open(MY_FILE_PATH) it gives me FileNotFoundException .

Does anybody know how to fix this?

Answer 1

Since my tests are just reading these files and returning file data as a String I was able to do that via getClass().getClassLoader().getResourceAsStream(MY_FILE_PATH) and then read file. Dont really need to read to use getShadowApplication().getAssets().open(MY_FILE_PATH) .

I just moved my test data files to src/test/resources and it worked. :)

Answer 2

I was able to make it like this:

1) Copy (or create) AndroidManifest.xml in test folder

2) Add @Config(emulateSdk = 18, manifest = "src/test/AndroidManifest.xml") for this specific test

I was able to read file. So it means you could play with AndroidManifest class and custom runner (more inspiration herehttps://groups.google.com/forum/#!topic/robolectric/YvbdqRFcdnA )

I think it could be also possible to play with build.gradle :

android {
  sourceSets {
    androidTest.setRoot( 'src/test' )

    androidTest {
      assets.srcDir file( 'src/test/assets' )
    }
  }
}

but I'm not sure since plugin doesn't create any build variant but just tasks.

Answer 3

In Android Studio, create test assets folder (right click on the test directory -> New -> Directory -> pick assets from the list). Add your file in the test assets folder you just created. In your Robolectric test you can read the file like this:

val context = ApplicationProvider.getApplicationContext<Context>()
context.resources.assets.open(SOME_FILENAME)
    .bufferedReader()