Add slugify method

src/Mixins/Expectation.php

@@ -1159,4 +1159,21 @@ final class Expectation
 
         return $this;
     }
+
+    /**
+     * Asserts that the value can be converted to a slug
+     *
+     * @return self<TValue>
+     */
+    public function toBeSlug(string $message = ''): self
+    {
+        if ($message === '') {
+            $message = "Failed asserting that {$this->value} can be converted to a slug.";
+        }
+
+        $slug = Str::slugify((string) $this->value);
+        Assert::assertNotEmpty($slug, $message);
+
+        return $this;
+    }
 }

src/Support/Str.php

@@ -116,4 +116,13 @@ final class Str
     {
         return (bool) filter_var($value, FILTER_VALIDATE_URL);
     }
+
+    /**
+     * Converts the given `$target` to a URL-friendly "slug".
+     */
+    public static function slugify(string $target): string
+    {
+        $target = preg_replace('/[^a-zA-Z0-9]+/', '-', $target);
+        return strtolower(trim($target, '-'));
+    }
 }