Add basic framework

tests/ReturnTestableResults.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Tests;
+
+use Symfony\Component\Console\Input\StringInput;
+use Symfony\Component\Console\Output\NullOutput;
+
+trait ReturnTestableResults
+{
+    public function part1ExampleResult(): int|string|null
+    {
+        $this->initialize(new StringInput(''), new NullOutput());
+
+        return $this->part1($this->exampleData);
+    }
+
+    public function part1Result(): int|string|null
+    {
+        $this->initialize(new StringInput(''), new NullOutput());
+
+        return $this->part1($this->data);
+    }
+
+    public function part2ExampleResult(): int|string|null
+    {
+        $this->initialize(new StringInput(''), new NullOutput());
+
+        return $this->part2($this->exampleData);
+    }
+
+    public function part2Result(): int|string|null
+    {
+        $this->initialize(new StringInput(''), new NullOutput());
+
+        return $this->part2($this->data);
+    }
+}