chore: import upstream snapshot with attribution

apps/sim/lib/pptx-renderer/renderer/background-renderer.test.ts

@@ -0,0 +1,98 @@
+/**
+ * @vitest-environment jsdom
+ */
+import { describe, expect, it } from 'vitest'
+import { parseXml } from '@/lib/pptx-renderer/parser/xml-parser'
+import { renderBackground } from '@/lib/pptx-renderer/renderer/background-renderer'
+import type { RenderContext } from '@/lib/pptx-renderer/renderer/render-context'
+
+const EMPTY_NODE = parseXml(
+  '<p:spTree xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main" />'
+)
+
+function createContext(backgroundXml: string): RenderContext {
+  const background = parseXml(backgroundXml)
+  const slide = {
+    index: 0,
+    nodes: [],
+    background,
+    layoutIndex: '',
+    rels: new Map(),
+    slidePath: 'ppt/slides/slide1.xml',
+    showMasterSp: true,
+  }
+
+  return {
+    presentation: {
+      width: 960,
+      height: 540,
+      slides: [slide],
+      layouts: new Map(),
+      masters: new Map(),
+      themes: new Map(),
+      slideToLayout: new Map(),
+      layoutToMaster: new Map(),
+      masterToTheme: new Map(),
+      media: new Map(),
+      charts: new Map(),
+      isWps: false,
+    },
+    slide,
+    theme: {
+      colorScheme: new Map([['bg1', '000000']]),
+      majorFont: { latin: 'Calibri', ea: '', cs: '' },
+      minorFont: { latin: 'Calibri', ea: '', cs: '' },
+      fillStyles: [],
+      lineStyles: [],
+      effectStyles: [],
+    },
+    master: {
+      colorMap: new Map(),
+      textStyles: {},
+      placeholders: [],
+      spTree: EMPTY_NODE,
+      rels: new Map(),
+    },
+    layout: {
+      placeholders: [],
+      spTree: EMPTY_NODE,
+      rels: new Map(),
+      showMasterSp: true,
+    },
+    mediaUrlCache: new Map(),
+    colorCache: new Map(),
+  }
+}
+
+describe('renderBackground', () => {
+  it('renders bgRef colors that resolve to black after modifiers', () => {
+    const ctx = createContext(`
+      <p:bg xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main"
+            xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main">
+        <p:bgRef idx="1001">
+          <a:schemeClr val="bg1">
+            <a:shade val="50000" />
+          </a:schemeClr>
+        </p:bgRef>
+      </p:bg>
+    `)
+    const container = document.createElement('div')
+
+    renderBackground(ctx, container)
+
+    expect(container.style.backgroundColor).toBe('rgb(0, 0, 0)')
+  })
+
+  it('keeps bgRef without a color node on the white fallback', () => {
+    const ctx = createContext(`
+      <p:bg xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main">
+        <p:bgRef idx="1001" />
+      </p:bg>
+    `)
+    const container = document.createElement('div')
+
+    renderBackground(ctx, container)
+
+    expect(container.style.backgroundColor).toBe('rgb(255, 255, 255)')
+  })
+})