add tests for experimentalParseClassName

tests/experimental-parse-class-name.test.ts

@@ -0,0 +1,37 @@
+import { extendTailwindMerge } from '../src'
+
+test('default case', () => {
+    const twMerge = extendTailwindMerge({
+        experimentalParseClassName({ className, parseClassName }) {
+            return parseClassName(className)
+        },
+    })
+
+    expect(twMerge('px-2 py-1 p-3')).toBe('p-3')
+})
+
+test('removing first three characters from class', () => {
+    const twMerge = extendTailwindMerge({
+        experimentalParseClassName({ className, parseClassName }) {
+            return parseClassName(className.slice(3))
+        },
+    })
+
+    expect(twMerge('barpx-2 foopy-1 lolp-3')).toBe('lolp-3')
+})
+
+test('ignoring breakpoint modifiers', () => {
+    const breakpoints = new Set(['sm', 'md', 'lg', 'xl', '2xl'])
+    const twMerge = extendTailwindMerge({
+        experimentalParseClassName({ className, parseClassName }) {
+            const parsed = parseClassName(className)
+
+            return {
+                ...parsed,
+                modifiers: parsed.modifiers.filter((modifier) => !breakpoints.has(modifier)),
+            }
+        },
+    })
+
+    expect(twMerge('md:px-2 hover:py-4 py-1 lg:p-3')).toBe('hover:py-4 lg:p-3')
+})