diff --git a/frontend/src/__tests__/pr27Features.test.js b/frontend/src/__tests__/pr27Features.test.js
index 02ab2b7..7d8ded3 100644
--- a/frontend/src/__tests__/pr27Features.test.js
+++ b/frontend/src/__tests__/pr27Features.test.js
@@ -499,3 +499,46 @@ describe('volume field in recipe mapping — PR31', () => {
     expect(labels['']).toBe('')
   })
 })
+
+// ---------------------------------------------------------------------------
+// PR33: Oil card branding logic
+// ---------------------------------------------------------------------------
+describe('oil card branding — PR33', () => {
+  it('brand data determines card display elements', () => {
+    const brand = { qr_code: 'data:image/png;base64,abc', brand_bg: 'data:image/png;base64,bg', brand_logo: null, brand_name: '测试品牌', brand_align: 'center' }
+    expect(!!brand.qr_code).toBe(true)
+    expect(!!brand.brand_bg).toBe(true)
+    expect(!!brand.brand_logo).toBe(false)
+    expect(!!brand.brand_name).toBe(true)
+  })
+
+  it('empty brand shows plain card', () => {
+    const brand = {}
+    expect(!!brand.qr_code).toBe(false)
+    expect(!!brand.brand_bg).toBe(false)
+    expect(!!brand.brand_logo).toBe(false)
+  })
+
+  it('volumeLabel with name parameter works for drops and ml', () => {
+    // Simulates the fix: volumeLabel(dropCount, name) needs both params
+    const DROPS_TO_VOLUME = { 93: '5ml', 280: '15ml' }
+    function volumeLabel(dropCount, name) {
+      if (name === '无香乳液') return dropCount + 'ml'  // ml unit
+      return DROPS_TO_VOLUME[dropCount] || (dropCount + '滴')
+    }
+    expect(volumeLabel(280, '薰衣草')).toBe('15ml')
+    expect(volumeLabel(200, '无香乳液')).toBe('200ml')
+    expect(volumeLabel(93, '茶树')).toBe('5ml')
+  })
+
+  it('PDF export price unit adapts to product type', () => {
+    function oilPriceUnit(name) {
+      if (name === '无香乳液') return 'ml'
+      if (name === '植物空胶囊') return '颗'
+      return '滴'
+    }
+    expect(oilPriceUnit('薰衣草')).toBe('滴')
+    expect(oilPriceUnit('无香乳液')).toBe('ml')
+    expect(oilPriceUnit('植物空胶囊')).toBe('颗')
+  })
+})