CODEWITHSUNDEEP
javaandroidjunit
Rule
Rule

Reputation: 630

How to read resource file from unit test?

I have a Java-only module in my Android project. In that project I want to have a unit test that reads the contents from a local json file that is stored in the resources folder. Android Studio changes the icon of the resources folder, so I'd think it recognises it as the resources folder.

How I'm reading:

String json = Files.lines(Paths.get("file.json"))
                .parallel()
                .collect(Collectors.joining());

folder structure:

+project
  +app (android)
  +module (java only)
    +src
      +main
        +java
          +package
            -the java file
        +resources
            -file.json

My question is how can I read the file?

updated below

URL resource1 = getClass().getResource("file.json");
URL resource2 = getClass().getClassLoader().getResource("file.json");
URL resource3 = Thread.currentThread().getContextClassLoader().getResource("file.json");
URL resource4 = ClassLoader.getSystemClassLoader().getResource("file.json");

All these are null. I've copied the json file to resources/same.package.structure too, but to no success.

Upvotes: 6

Views: 19048

Answers (3)

Rule
Rule

Reputation: 630

Apparently it was a bug, should be fixed now: https://issuetracker.google.com/issues/63612779

Thank you all for your help

Upvotes: -1

Anton Kazakov
Anton Kazakov

Reputation: 2764

Don't need to do all this complicated stuff with ClassLoaders. You have access to test/resources directory from you /test/* classes.

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UPD This is how to deserialize file using its path using SimpleXML. So here source method param is your path to resource file

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Upvotes: 7

holi-java
holi-java

Reputation: 30676

you should using Paths.get(URI) instead, for example:

ClassLoader loader = ClassLoader.getSystemClassLoader();

String json = Files.lines(Paths.get(loader.getResource("file.json").toURI()))
                   .parallel()
                   .collect(Collectors.joining());

this is because you run your tests in android platform, and the resoruces were packaged in a jar, please using BufferedReader.lines instead, for example:

ClassLoader  loader = activity.getClassLoader();

BufferedReader in = new BufferedReader(new InputStreamReader(
   loader.getResourceAsStream("file.json"),"UTF-8"
));

String json = in.lines()
                .parallel()
                .collect(Collectors.joining());

Upvotes: 3

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