add code

tests/Pest/UsesTraitTest.php

@@ -0,0 +1,29 @@
+<?php
+
+it('checks for the presence of a trait', function () {
+    expect(uses_trait(Foo::class, FirstTrait::class))->toBeTrue();
+    expect(uses_trait(Foo::class, SecondTrait::class))->toBeFalse();
+});
+
+it('checks recursively', function () {
+    expect(uses_trait(Bar::class, FirstTrait::class))->toBeTrue(); // inherited
+    expect(uses_trait(Bar::class, SecondTrait::class))->toBeTrue();
+});
+
+it('accepts both objects and classes', function () {
+    expect(uses_trait(new Foo, FirstTrait::class))->toBeTrue();
+    expect(uses_trait(new Foo, SecondTrait::class))->toBeFalse();
+});
+
+trait FirstTrait {}
+trait SecondTrait {}
+
+class Foo
+{
+    use FirstTrait;
+}
+
+class Bar extends Foo
+{
+    use SecondTrait;
+}