netinfo/netinfo-basics.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>NetInfo basic functionality</title>
<link rel="help" href="https://wicg.github.io/netinfo/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<script>
test(function() {
      assert_in_array(navigator.connection.type,  ["bluetooth", "cellular",
        "ethernet", "mixed", "none", "other", "unknown", "wifi", "wimax"], 'type is unexpected');
}, "type attribute");

test(function() {
      assert_in_array(navigator.connection.saveData,  [false, true], 'saveData is unexpected');
}, "saveData attribute");

test(function() {
      assert_greater_than_equal(navigator.connection.downlinkMax, 0);
}, "downlinkMax attribute");

test(function() {
      assert_in_array(navigator.connection.effectiveType, ["slow-2g", "2g",
          "3g", "4g"], 'effectiveType is unexpected');
}, "effectiveType attribute");

test(function() {
      var rtt  = navigator.connection.rtt;
      assert_greater_than_equal(rtt, 0);
      assert_less_than_equal(rtt, 3000);
      assert_equals(rtt % 50, 0, 'rtt must be a multiple of 50 msec');
}, "rtt attribute");

test(function() {
  var downlinkKbps  = navigator.connection.downlink * 1000;
  assert_greater_than_equal(downlinkKbps, 0);
  assert_less_than_equal(downlinkKbps, 10000);

  // Verify that downlinkKbps is a multiple of 50.
  var quotient = parseInt(downlinkKbps  / 50, 10);
  // mod is the remainder left after dividing downlinkKbps by 50 while
  // restricting the quotient to an integer. For example, if downlinkKbps is
  // 1050, then mod will be 0. If downlinkKpbps is 1030, mod will be 30.
  var mod = downlinkKbps - 50 * quotient;
  assert_less_than_equal(0.0, mod, 'mod outside the range');
  assert_greater_than(50.0, mod, 'mod outside the range');
  // It is possible that mod is not exactly 0 because of floating point
  // computations. e.g., downlinkKbps may be 99.999999, in which case mod
  // will be 49.999999.
  assert_true(mod < 1e-5 || (50-mod) < 1e-5, 'downlink must be a multiple of 50 kbps');
}, "downlink attribute");
</script>