test(google): check if filteration provides correct values

test/index.test.ts

@@ -1,5 +1,16 @@
 import { describe, expect, it } from 'vitest'
-import { createUnifont, providers } from '../src'
+import { createUnifont, providers, type ResolveFontOptions } from '../src'
+
+// TODO: move to a test/utils folder or something else
+// Quick and dirty way to pick into a new array, not needed if the test is un-necessary
+function pickUniqueBy<T, K>(arr: T[], by: (arg: T) => K): K[] {
+  return [...arr.reduce((acc, fnt) => {
+    const prop = by(fnt)
+    if (!acc.has(prop))
+      acc.add(prop)
+    return acc
+  }, new Set<K>())]
+}
 
 describe('unifont', () => {
   it('works with no providers', async () => {
@@ -17,12 +28,29 @@ describe('unifont', () => {
   })
 
   it('works with google provider', async () => {
-    const unifont = await createUnifont([
-      providers.google(),
-    ])
+    const unifont = await createUnifont([providers.google()])
 
     const { fonts } = await unifont.resolveFont('Poppins')
 
     expect(fonts).toHaveLength(6)
   })
+
+  it('filters the fonts with google provider', async () => {
+    const unifont = await createUnifont([providers.google()])
+
+    const styles = ['normal'] as ResolveFontOptions['styles']
+    const weights = ['600']
+    const { fonts } = await unifont.resolveFont('Poppins', {
+      styles,
+      weights,
+      subsets: [],
+    })
+
+    const resolvedStyles = pickUniqueBy(fonts, fnt => fnt.style)
+    const resolvedWeights = pickUniqueBy(fonts, fnt => String(fnt.weight))
+
+    expect(fonts).toHaveLength(3)
+    expect(resolvedStyles).toMatchObject(styles)
+    expect(resolvedWeights).toMatchObject(weights)
+  })
 })