add isSponsor() method to check if someone is a sponsor

README.md

@@ -36,4 +36,6 @@ GithubSponsors::fromOrganization('Astrotomic')->all(); // all sponsors for given
 GithubSponsors::fromViewer()->cursor(); // lazy collection - using less memory
 
 GithubSponsors::fromViewer()->select('login', 'name', 'avatarUrl')->all(); // select specific attributes
+
+GithubSponsors::fromViewer()->isSponsor('Gummibeer'); // check if someone is a sponsor
 ```

src/GithubSponsors.php

@@ -11,6 +11,7 @@
 use Illuminate\Support\Facades\Http;
 use Illuminate\Support\Fluent;
 use Illuminate\Support\LazyCollection;
+use Illuminate\Support\Str;
 
 class GithubSponsors
 {
@@ -66,6 +67,14 @@ public function all(): Collection
         return $this->cursor()->collect();
     }
 
+    public function isSponsor(string $login): bool
+    {
+        return $this
+            ->select('login')
+            ->cursor()
+            ->contains(fn(Fluent $sponsor): bool => $sponsor->login === $login);
+    }
+
     public function cursor(): LazyCollection
     {
         return LazyCollection::make(function (): Generator {

tests/Feature/GithubSponsorsTest.php

@@ -61,3 +61,19 @@
             ->__typename->toBeString()->toBeIn(['User', 'Organization'])
             ->login->toBeString();
     });
+
+it('checks if someone is a sponsor')
+    ->expect(fn() => GithubSponsors::fromOrganization('larabelles')->isSponsor('Gummibeer'))
+    ->toBeTrue();
+
+it('checks if someone is a sponsor is casesensitive')
+    ->expect(fn() => GithubSponsors::fromOrganization('larabelles')->isSponsor('gummibeer'))
+    ->toBeFalse();
+
+it('checks if someone is not a sponsor')
+    ->expect(fn() => GithubSponsors::fromViewer()->isSponsor('Gummibeer'))
+    ->toBeFalse();
+
+it('checks if an organization is a sponsor')
+    ->expect(fn() => GithubSponsors::fromViewer()->isSponsor('spatie'))
+    ->toBeTrue();