Test coverage for NodeStatsTracker

ui/tests/unit/utils/node-stats-tracker-test.js

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+import EmberObject from '@ember/object';
+import { assign } from '@ember/polyfills';
+import wait from 'ember-test-helpers/wait';
+import { module, test } from 'ember-qunit';
+import sinon from 'sinon';
+import Pretender from 'pretender';
+import NodeStatsTracker, { stats } from 'nomad-ui/utils/classes/node-stats-tracker';
+import fetch from 'nomad-ui/utils/fetch';
+
+module('Unit | Util | NodeStatsTracker');
+
+const refDate = Date.now();
+
+const MockNode = overrides =>
+  assign(
+    {
+      id: 'some-identifier',
+      resources: {
+        cpu: 2000,
+        memory: 4096,
+      },
+    },
+    overrides
+  );
+
+const mockFrame = step => ({
+  CPUTicksConsumed: step + 1000,
+  Memory: {
+    Used: (step + 2048) * 1024 * 1024,
+  },
+  Timestamp: refDate + step,
+});
+
+test('the NodeStatsTracker constructor expects a fetch definition and a node', function(assert) {
+  const tracker = NodeStatsTracker.create();
+  assert.throws(
+    () => {
+      tracker.poll();
+    },
+    /StatsTrackers need a fetch method/,
+    'Polling does not work without a fetch method provided'
+  );
+});
+
+test('the url property is computed based off the node id', function(assert) {
+  const node = MockNode();
+  const tracker = NodeStatsTracker.create({ fetch, node });
+
+  assert.equal(
+    tracker.get('url'),
+    `/v1/client/stats?node_id=${node.id}`,
+    'Url is derived from the node id'
+  );
+});
+
+test('reservedCPU and reservedMemory properties come from the node', function(assert) {
+  const node = MockNode();
+  const tracker = NodeStatsTracker.create({ fetch, node });
+
+  assert.equal(tracker.get('reservedCPU'), node.resources.cpu, 'reservedCPU comes from the node');
+  assert.equal(
+    tracker.get('reservedMemory'),
+    node.resources.memory,
+    'reservedMemory comes from the node'
+  );
+});
+
+test('poll results in requesting the url and calling append with the resulting JSON', function(assert) {
+  const node = MockNode();
+  const tracker = NodeStatsTracker.create({ fetch, node, append: sinon.spy() });
+  const mockFrame = {
+    Some: {
+      data: ['goes', 'here'],
+      twelve: 12,
+    },
+  };
+
+  const server = new Pretender(function() {
+    this.get('/v1/client/stats', () => [200, {}, JSON.stringify(mockFrame)]);
+  });
+
+  tracker.poll();
+
+  assert.equal(server.handledRequests.length, 1, 'Only one request was made');
+  assert.equal(
+    server.handledRequests[0].url,
+    `/v1/client/stats?node_id=${node.id}`,
+    'The correct URL was requested'
+  );
+
+  return wait().then(() => {
+    assert.ok(
+      tracker.append.calledWith(mockFrame),
+      'The JSON response was passed into append as a POJO'
+    );
+
+    server.shutdown();
+  });
+});
+
+test('append appropriately maps a data frame to the tracked stats for cpu and memory for the node', function(assert) {
+  const node = MockNode();
+  const tracker = NodeStatsTracker.create({ fetch, node });
+
+  assert.deepEqual(tracker.get('cpu'), [], 'No tracked cpu yet');
+  assert.deepEqual(tracker.get('memory'), [], 'No tracked memory yet');
+
+  tracker.append(mockFrame(1));
+
+  assert.deepEqual(
+    tracker.get('cpu'),
+    [{ timestamp: refDate + 1, used: 1001, percent: 1001 / 2000 }],
+    'One frame of cpu'
+  );
+
+  assert.deepEqual(
+    tracker.get('memory'),
+    [{ timestamp: refDate + 1, used: 2049 * 1024 * 1024, percent: 2049 / 4096 }],
+    'One frame of memory'
+  );
+
+  tracker.append(mockFrame(2));
+
+  assert.deepEqual(
+    tracker.get('cpu'),
+    [
+      { timestamp: refDate + 1, used: 1001, percent: 1001 / 2000 },
+      { timestamp: refDate + 2, used: 1002, percent: 1002 / 2000 },
+    ],
+    'Two frames of cpu'
+  );
+
+  assert.deepEqual(
+    tracker.get('memory'),
+    [
+      { timestamp: refDate + 1, used: 2049 * 1024 * 1024, percent: 2049 / 4096 },
+      { timestamp: refDate + 2, used: 2050 * 1024 * 1024, percent: 2050 / 4096 },
+    ],
+    'Two frames of memory'
+  );
+});
+
+test('each stat list has maxLength equal to bufferSize', function(assert) {
+  const node = MockNode();
+  const bufferSize = 10;
+  const tracker = NodeStatsTracker.create({ fetch, node, bufferSize });
+
+  for (let i = 1; i <= 20; i++) {
+    tracker.append(mockFrame(i));
+  }
+
+  assert.equal(
+    tracker.get('cpu.length'),
+    bufferSize,
+    `20 calls to append, only ${bufferSize} frames in the stats array`
+  );
+  assert.equal(
+    tracker.get('memory.length'),
+    bufferSize,
+    `20 calls to append, only ${bufferSize} frames in the stats array`
+  );
+
+  assert.equal(
+    tracker.get('cpu')[0].timestamp,
+    refDate + 11,
+    'Old frames are removed in favor of newer ones'
+  );
+  assert.equal(
+    tracker.get('memory')[0].timestamp,
+    refDate + 11,
+    'Old frames are removed in favor of newer ones'
+  );
+});
+
+test('the stats computed property macro constructs a NodeStatsTracker based on a nodeProp and a fetch definition', function(assert) {
+  const node = MockNode();
+  const fetchSpy = sinon.spy();
+
+  const SomeClass = EmberObject.extend({
+    stats: stats('theNode', function() {
+      return () => fetchSpy(this);
+    }),
+  });
+  const someObject = SomeClass.create({
+    theNode: node,
+  });
+
+  assert.equal(
+    someObject.get('stats.url'),
+    `/v1/client/stats?node_id=${node.id}`,
+    'stats computed property macro creates a NodeStatsTracker'
+  );
+
+  someObject.get('stats').fetch();
+
+  assert.ok(
+    fetchSpy.calledWith(someObject),
+    'the fetch factory passed into the macro gets called to assign a bound version of fetch to the NodeStatsTracker instance'
+  );
+});
+
+test('changing the value of the nodeProp constructs a new NodeStatsTracker', function(assert) {
+  const node1 = MockNode();
+  const node2 = MockNode();
+  const SomeClass = EmberObject.extend({
+    stats: stats('theNode', () => fetch),
+  });
+
+  const someObject = SomeClass.create({
+    theNode: node1,
+  });
+
+  const stats1 = someObject.get('stats');
+
+  someObject.set('theNode', node2);
+  const stats2 = someObject.get('stats');
+
+  assert.notOk(
+    stats1 === stats2,
+    'Changing the value of the node results in creating a new NodeStatsTracker instance'
+  );
+});