test: Add test for UnserializableParamError on empty string (#21)

* test: Add test for UnserializableParamError on empty string

* ci: Format code

---------

Co-authored-by: Seam Bot <[email protected]>

Author: razor-x

test/serialization.test.ts

@@ -149,6 +149,12 @@ test('cannot serialize non-plain objects', (t) => {
   })
 })
 
+test('cannot serialize the empty string', (t) => {
+  t.throws(() => serializeUrlSearchParams({ foo: '' }), {
+    instanceOf: UnserializableParamError,
+  })
+})
+
 test('cannot serialize array params with unserializable values', (t) => {
   t.throws(() => serializeUrlSearchParams({ foo: [''] }), {
     instanceOf: UnserializableParamError,