test/unit/test-context.js

// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

/**
 * @fileoverview Tests for the context library.
 */

var test = require('tape');
var context = require('../../src/context');
var verror = require('../../src/gen-vdl/v.io/v23/verror');

var ctx = context.Context();

test('Root Context', function(assert) {
  assert.equal(ctx.deadline(), null);
  assert.equal(ctx.done(), false);
  assert.end();
});


var key1 = new context.ContextKey();
var key2 = new context.ContextKey();
var vctx1 = ctx.withValue(key1, 'value1');
var vctx2 = vctx1.withValue(key2, 'value2');

test('ValueContext (own value)', function(assert) {
  assert.equal(vctx1.value(key1), 'value1');
  assert.equal(vctx2.value(key2), 'value2');
  assert.end();
});

test('ValueContext (parent/child values)', function(assert) {
  assert.equal(vctx2.value(key1), 'value1');
  assert.equal(vctx1.value(key2), null);
  assert.end();
});

// TODO(bprosnitz) WithValue is not immutable.
test.skip('WithValue Immutability', function(assert) {
  var expectedRes = 99;
  var vctx3 = vctx2.withValue('key3', {
    x : expectedRes
  });
  var vctx4 = vctx3.withValue('something', 'something2');
  vctx4.value('key3').x = 77;
  assert.equal(vctx3.value('key3').x, expectedRes,
    'Expected to not have changed');
});

test('CancelContext.done', function(assert) {
  var cctx = ctx.withCancel();
  assert.plan(3);

  assert.equal(cctx.done(), false);
  cctx.waitUntilDone().catch(onerror);
  cctx.cancel();
  assert.equal(cctx.done(), true);

  function onerror(error) {
    assert.ok(error instanceof verror.CanceledError);
  }
});

test('CancelContext.finish', function(assert) {
  var cctx = ctx.withCancel();
  assert.plan(3);

  assert.equal(cctx.done(), false);
  cctx.waitUntilDone().then(ondone);
  cctx.finish();
  assert.equal(cctx.done(), true);

  function ondone(arg) {
    assert.equal(arg, undefined);
  }
});

test('CancelContext (parent cancellation)', function(assert) {
  var cctx1 = ctx.withCancel();
  var cctx2 = cctx1.withCancel();
  assert.plan(4);

  cctx1.waitUntilDone().catch(onerror);
  cctx2.waitUntilDone().catch(onerror);
  cctx1.cancel();
  assert.equal(cctx1.done(), true);
  assert.equal(cctx2.done(), true);

  function onerror(error) {
    assert.ok(error instanceof verror.CanceledError);
  }
});

test('CancelContext (ancestor cancellation)', function(assert) {
  var cctx1 = ctx.withCancel();
  cctx1.withValue(context.ContextKey(), 'value');
  var cctx2 = cctx1.withCancel();
  assert.plan(4);

  cctx1.waitUntilDone().catch(onerror);
  cctx2.waitUntilDone().catch(onerror);
  cctx1.cancel();
  assert.equal(cctx1.done(), true);
  assert.equal(cctx2.done(), true);

  function onerror(error) {
    assert.ok(error instanceof verror.CanceledError);
  }
});

test('DeadlineContext', function(assert) {
  var dctx = ctx.withDeadline(Date.now() + 1);
  assert.plan(2);
  dctx.waitUntilDone().catch(onerror);

  function onerror(error) {
    assert.ok(error instanceof verror.TimeoutError);
    assert.equal(dctx.done(), true);
  }
});

test('DeadlineContext (parent cancellation)', function(assert) {
  var cctx = ctx.withCancel();
  var dctx = cctx.withDeadline(Date.now() + 1000 * 3600);
  assert.plan(4);

  cctx.waitUntilDone().catch(onerror);
  dctx.waitUntilDone().catch(onerror);
  cctx.cancel();
  assert.equal(cctx.done(), true);
  assert.equal(dctx.done(), true);

  function onerror(error) {
    assert.ok(error instanceof verror.CanceledError);
  }
});

test('DeadlineContext (child cancellation)', function(assert) {
  var dctx = ctx.withDeadline(Date.now() + 1);
  var cctx = dctx.withCancel();

  assert.plan(2);

  cctx.waitUntilDone().catch(onerror);
  dctx.waitUntilDone().catch(onerror);

  function onerror(error) {
    assert.ok(error instanceof verror.TimeoutError);
  }
});