svoid test_isValidFileName() {
  assertFunctionValues isValidFileName(
    "", false,
    ".", false,
    "..", false,
    "a/b", false,
    "\"", false,
    "\\", false,
    "abc", true,
    "c:", false,
    "<bla", false,
    ">bla", false,
    "this|that", false,
    "test-1 2 3_4.html", true);
}

Began life as a copy of #1027711