Method test_preload_file

test/test_browser.py:316–458

(self)

  @also_with_wasmfs
  def test_preload_file(self):
    create_file('somefile.txt', 'load me right before running the code please')
    create_file('.somefile.txt', 'load me right before running the code please')
    create_file('some@file.txt', 'load me right before running the code please')

    absolute_src_path = os.path.abspath('somefile.txt')

    def make_main(path):
      print('make main at', path)
      path = path.replace('\\', '\\\\').replace('"', '\\"') # Escape tricky path name for use inside a C string.
      # TODO: change this when wasmfs supports relative paths.
      if self.get_setting('WASMFS'):
        path = "/" + path
      create_file('main.c', r'''
        #include <assert.h>
        #include <stdio.h>
        #include <string.h>
        #include <emscripten.h>
        int main() {
          FILE *f = fopen("%s", "r");
          char buf[100];
          fread(buf, 1, 20, f);
          buf[20] = 0;
          fclose(f);
          printf("|%%s|\n", buf);

          assert(strcmp("load me right before", buf) == 0);
          return 0;
        }
        ''&#x27; % path)

    test_cases = [
      # (source preload-file string, file on target FS to load)
      ("somefile.txt", "somefile.txt"),
      (".somefile.txt@somefile.txt", "somefile.txt"),
      ("./somefile.txt", "somefile.txt"),
      ("somefile.txt@file.txt", "file.txt"),
      ("./somefile.txt@file.txt", "file.txt"),
      ("./somefile.txt@./file.txt", "file.txt"),
      ("somefile.txt@/file.txt", "file.txt"),
      ("somefile.txt@/", "somefile.txt"),
      (absolute_src_path + "@file.txt", "file.txt"),
      (absolute_src_path + "@/file.txt", "file.txt"),
      (absolute_src_path + "@/", "somefile.txt"),
      ("somefile.txt@/directory/file.txt", "/directory/file.txt"),
      ("somefile.txt@/directory/file.txt", "directory/file.txt"),
      (absolute_src_path + "@/directory/file.txt", "directory/file.txt"),
      ("some@@file.txt@other.txt", "other.txt"),
      ("some@@file.txt@some@@otherfile.txt", "some@otherfile.txt")]

    for srcpath, dstpath in test_cases:
      print('Testing', srcpath, dstpath)
      make_main(dstpath)
      self.btest_exit('main.c', cflags=['--preload-file', srcpath])
    if WINDOWS:
      # On Windows, the following non-alphanumeric non-control code ASCII characters are supported.
      # The characters <, >, ", |, ?, * are not allowed, because the Windows filesystem doesn't support those.
      tricky_filename = '!#$%&\'()+,-. ;=@[]^_`{}~.txt&#x27;