Add test with strict_types

Author: AydinHassan

test/Exercise/UniteTheTypesTest.php

@@ -117,4 +117,11 @@ public function testSuccessfulSolutionWithFloatReturnType(): void
 
         $this->assertVerifyWasSuccessful();
     }
+
+    public function testSuccessfulSolutionWithStrictTypes(): void
+    {
+        $this->runExercise('correct-union-type-strict-types.php');
+
+        $this->assertVerifyWasSuccessful();
+    }
 }

test/solutions/unite-the-types/correct-union-type-strict-types.php

@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+function adder(string|float|int ...$numbers) {
+    return array_sum($numbers);
+}
+
+$nums = $argv;
+array_shift($nums);
+
+echo adder(...$nums) . "\n";