Question

I’m writing an Android JUnit test and want to copy/reset a test fixture file (it’s an SQLite database file.) If I were within the main application, I know I could just place the file in the assets directory and use getResources().getAssets().open(sourceFile)

However, this API appears to be unavailable from the ActivityInstrumentationTestCase2 class.

Is there an easy way to copy a file over from the testing PC, or should I just keep a fresh copy of a test fixture on the device and copy it over a temporary file?

Thanks!

Answer 1

What I’ve done to accomplish this (in a not very elegant way) is to copy the test fixture onto my device (or emulated device.) I named it “cleantestdatabase.db.” Then in the test code, I copy it to “testdatabase.db,” so that I can modify it with my tests but reset it to a known state. Here’s the code:

copyFile("cleantestdatabase.db", "testdatabase.db");

private void copyFile(String source, String dest) throws IOException{
    String rootPath = Environment.getExternalStorageDirectory().getAbsolutePath() + getActivity().getString(R.string.default_dir);
    File newDir = new File(rootPath);
    boolean result = newDir.mkdir();
    if(result == false){
        Log.e("Error", "result false");
    }

    InputStream in = new FileInputStream(rootPath + source);    
    File outFile = new File(rootPath + dest);
    if(outFile.exists()) {
        outFile.delete();
    }
    outFile.createNewFile();

    OutputStream out = new FileOutputStream(outFile);
    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) > 0) {
        out.write(buf, 0, len);
    }
    in.close();
    out.close();
}