Add fixture-based unit tests for parseUnits()

Add 6 new tests using sample-listing-empty.html and
sample-listing-call.html fixtures:

- Verify empty section container returns empty array
- Verify zero-count logging for empty fixtures
- Verify extraction of "Call for pricing" units
- Verify raw string preservation for price fields
- Verify all attribute extraction from call-for-pricing units
- Verify image_url handling when img elements are absent

Total parseUnits test coverage: 28 tests across 9 describe blocks.

__tests__/scraper/parseUnits.test.js

@@ -384,7 +384,93 @@ describe('parseUnits', () => {
   });
 
   // ---------------------------------------------------------------
-  // 7. Multiple units with varied data
+  // 7. Fixture-based tests (sample-listing-empty.html, sample-listing-call.html)
+  // ---------------------------------------------------------------
+  describe('fixture: sample-listing-empty.html', () => {
+    let emptyHtml;
+
+    beforeAll(() => {
+      emptyHtml = fs.readFileSync(
+        path.join(fixturesDir, 'sample-listing-empty.html'),
+        'utf-8'
+      );
+    });
+
+    it('should return empty array when fixture has container but no articles', () => {
+      const units = parseUnits(emptyHtml, mockLogger);
+
+      expect(units).toEqual([]);
+      // Container exists so no error about missing container
+      expect(mockLogger.error).not.toHaveBeenCalled();
+    });
+
+    it('should log zero parsed units for empty fixture', () => {
+      parseUnits(emptyHtml, mockLogger);
+
+      expect(mockLogger.info).toHaveBeenCalledWith(
+        'Units parsed',
+        expect.objectContaining({ count: 0 })
+      );
+    });
+  });
+
+  describe('fixture: sample-listing-call.html', () => {
+    let callHtml;
+
+    beforeAll(() => {
+      callHtml = fs.readFileSync(
+        path.join(fixturesDir, 'sample-listing-call.html'),
+        'utf-8'
+      );
+    });
+
+    it('should extract both units from the call-for-pricing fixture', () => {
+      const units = parseUnits(callHtml, mockLogger);
+
+      expect(units).toHaveLength(2);
+      expect(units.map(u => u.unit_code)).toEqual(['P-101', 'P-102']);
+    });
+
+    it('should preserve "Call for pricing" as raw string in the price field', () => {
+      const units = parseUnits(callHtml, mockLogger);
+
+      expect(units[0].price).toBe('Call for pricing');
+      expect(units[1].price).toBe('Call for pricing');
+    });
+
+    it('should extract all attributes correctly from call-for-pricing units', () => {
+      const units = parseUnits(callHtml, mockLogger);
+      const unit = units.find(u => u.unit_code === 'P-101');
+
+      expect(unit.id).toBe('9001');
+      expect(unit.unit_id).toBe('9001');
+      expect(unit.floor).toBe('1');
+      expect(unit.area).toBe('750');
+      expect(unit.bed_count).toBe('1');
+      expect(unit.bath_count).toBe('1');
+      expect(unit.available).toBe('true');
+      expect(unit.unavailable).toBe('false');
+      expect(unit.soonest).toBe('Now');
+      expect(unit.date_available).toBe('1706745600');
+      expect(unit.plan_id).toBe('500');
+      expect(unit.plan_name).toBe('Penthouse A');
+      expect(unit.community).toBe('Country Club Towers');
+      expect(unit.asset).toBe('420');
+      expect(unit.href).toBe('?spaces_tab=unit-detail&detail=9001');
+      expect(unit.inventory_href).toBe('?spaces_tab=unit-detail&detail=9001');
+      expect(unit.specials_content).toBe('');
+    });
+
+    it('should not have image_url when fixture units lack img elements', () => {
+      const units = parseUnits(callHtml, mockLogger);
+
+      expect(units[0].image_url).toBeUndefined();
+      expect(units[1].image_url).toBeUndefined();
+    });
+  });
+
+  // ---------------------------------------------------------------
+  // 8. Multiple units with varied data
   // ---------------------------------------------------------------
   describe('varied unit data', () => {
     it('should handle unavailable units correctly', () => {