open-consul/ui-v2/tests/unit/utils/dom/event-source/blocking-test.js

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import domEventSourceBlocking, {
validateCursor,
create5xxBackoff,
} from 'consul-ui/utils/dom/event-source/blocking';
import { module } from 'qunit';
import test from 'ember-sinon-qunit/test-support/test';
module('Unit | Utility | dom/event-source/blocking');
const createEventSource = function() {
return class {
constructor(cb) {
this.readyState = 1;
this.source = cb;
this.source.apply(this, arguments);
}
addEventListener() {}
removeEventListener() {}
dispatchEvent() {}
close() {}
};
};
const createPromise = function(resolve = function() {}) {
class PromiseMock {
constructor(cb = function() {}) {
cb(resolve);
}
then(cb) {
setTimeout(() => cb.bind(this)(), 0);
return this;
}
catch(cb) {
cb({ message: 'error' });
return this;
}
}
PromiseMock.resolve = function() {
return new PromiseMock();
};
return PromiseMock;
};
test('it creates an BlockingEventSource class implementing EventSource', function(assert) {
const EventSource = createEventSource();
const BlockingEventSource = domEventSourceBlocking(EventSource, function() {});
assert.ok(BlockingEventSource instanceof Function);
const source = new BlockingEventSource(function() {
return createPromise().resolve();
});
assert.ok(source instanceof EventSource);
});
test("the 5xx backoff continues to throw when it's not a 5xx", function(assert) {
const backoff = create5xxBackoff();
[
undefined,
null,
new Error(),
{ errors: [] },
{ errors: [{ status: '0' }] },
{ errors: [{ status: 501 }] },
{ errors: [{ status: '401' }] },
{ errors: [{ status: '500' }] },
{ errors: [{ status: '5' }] },
{ errors: [{ status: '50' }] },
{ errors: [{ status: '5000' }] },
{ errors: [{ status: '5050' }] },
].forEach(function(item) {
assert.throws(function() {
backoff(item);
});
});
});
test('the 5xx backoff returns a resolve promise on a 5xx (apart from 500)', function(assert) {
[
{ errors: [{ status: '501' }] },
{ errors: [{ status: '503' }] },
{ errors: [{ status: '504' }] },
{ errors: [{ status: '524' }] },
].forEach(item => {
const timeout = this.stub().callsArg(0);
const resolve = this.stub().withArgs(item);
const Promise = createPromise(resolve);
const backoff = create5xxBackoff(undefined, Promise, timeout);
const promise = backoff(item);
assert.ok(promise instanceof Promise, 'a promise was returned');
assert.ok(resolve.calledOnce, 'the promise was resolved with the correct arguments');
assert.ok(timeout.calledOnce, 'timeout was called once');
});
});
test("the cursor validation always returns undefined if the cursor can't be parsed to an integer", function(assert) {
['null', null, '', undefined].forEach(item => {
const actual = validateCursor(item);
assert.equal(actual, undefined);
});
});
test('the cursor validation always returns a cursor greater than zero', function(assert) {
[
{
cursor: 0,
expected: 1,
},
{
cursor: -10,
expected: 1,
},
{
cursor: -1,
expected: 1,
},
{
cursor: -1000,
expected: 1,
},
{
cursor: 10,
expected: 10,
},
].forEach(item => {
const actual = validateCursor(item.cursor);
assert.equal(actual, item.expected, 'cursor is greater than zero');
});
});
test('the cursor validation resets to 1 if its less than the previous cursor', function(assert) {
[
{
previous: 100,
cursor: 99,
expected: 1,
},
{
previous: 100,
cursor: -10,
expected: 1,
},
{
previous: 100,
cursor: 0,
expected: 1,
},
{
previous: 100,
cursor: 101,
expected: 101,
},
].forEach(item => {
const actual = validateCursor(item.cursor, item.previous);
assert.equal(actual, item.expected);
});
});