Refine player control-plane flow

test/player-preload-helpers.test.js

@@ -0,0 +1,98 @@
+const fs = require('node:fs');
+const path = require('node:path');
+const vm = require('node:vm');
+const test = require('node:test');
+const assert = require('node:assert/strict');
+
+function loadScript(scriptPath, sandbox) {
+  const source = fs.readFileSync(scriptPath, 'utf8');
+  vm.runInNewContext(source, sandbox, { filename: scriptPath });
+}
+
+test('webpage preloading only targets the next slide', () => {
+  const sandbox = {
+    window: null,
+    Date,
+    Array,
+    Number,
+    String,
+    Boolean,
+    Object,
+    Math,
+    console,
+    escapeHtml(value) {
+      return String(value || '');
+    },
+    currentPlaylistSignature: 'signature',
+    slides: [],
+    index: 0,
+    activeSlidesCacheKey: '',
+    activeSlidesCacheValue: [],
+    renderCacheViewportKey: '',
+    preloadSignature: '',
+    preloadContainer: null
+  };
+  sandbox.window = sandbox;
+
+  loadScript(path.join(__dirname, '..', 'src', 'player', 'public', 'js', 'player-page-playlist.js'), sandbox);
+
+  const current = { id: 1 };
+  const next = { id: 2 };
+  const later = { id: 3 };
+
+  assert.equal(sandbox.getWebpagePreloadSlides([current, next, later], 0).map((slide) => slide.id).join(','), '2');
+  assert.equal(sandbox.getWebpagePreloadSlides([current, next, later], 1).map((slide) => slide.id).join(','), '3');
+  assert.equal(sandbox.getWebpagePreloadSlides([current, next, later], 2).map((slide) => slide.id).join(','), '');
+});
+
+test('rtmp warmups only target the next slide', () => {
+  const sandbox = {
+    window: null,
+    Date,
+    Array,
+    Number,
+    String,
+    Boolean,
+    Object,
+    Math,
+    console,
+    fetch() {
+      throw new Error('not expected');
+    },
+    currentPlaylistSkipUnavailableRtmp: false,
+    videoRegionRenderVersion: 0,
+    slideMarkupCache: Object.create(null),
+    slides: [],
+    index: 0,
+    setTimeout,
+    clearTimeout,
+    document: {
+      createElement() {
+        return {
+          className: '',
+          setAttribute() {},
+          appendChild() {},
+          parentNode: null,
+          addEventListener() {}
+        };
+      },
+      body: {
+        appendChild() {}
+      }
+    },
+    pulsePlayerRegionTypes: {
+      register() {}
+    }
+  };
+  sandbox.window = sandbox;
+
+  loadScript(path.join(__dirname, '..', 'src', 'player', 'regions', 'rtmp.js'), sandbox);
+
+  const current = { id: 1 };
+  const next = { id: 2 };
+  const later = { id: 3 };
+
+  assert.equal(sandbox.getRtmpWarmupSlides([current, next, later], 0).map((slide) => slide.id).join(','), '2');
+  assert.equal(sandbox.getRtmpWarmupSlides([current, next, later], 1).map((slide) => slide.id).join(','), '3');
+  assert.equal(sandbox.getRtmpWarmupSlides([current, next, later], 2).map((slide) => slide.id).join(','), '');
+});