add test case for px value in spacing scale

Author: dcastil

tests/class-group-conflicts.test.ts

@@ -14,6 +14,7 @@ test('merges classes from same group correctly', () => {
         twMerge('overflow-x-auto hover:overflow-x-hidden hover:overflow-x-auto overflow-x-scroll'),
     ).toBe('hover:overflow-x-auto overflow-x-scroll')
     expect(twMerge('col-span-1 col-span-full')).toBe('col-span-full')
+    expect(twMerge('gap-2 gap-px basis-px basis-3')).toBe('gap-px basis-3')
 })
 
 test('merges classes from Font Variant Numeric section correctly', () => {