Exception for missing solution file

Author: AydinHassan

src/Exception/SolutionFileDoesNotExistException.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpSchool\PhpWorkshop\Exception;
+
+/**
+ * Represents the situation where an exercise requires compares a user generated file with
+ * one provided with the solution but it does not exist
+ */
+class SolutionFileDoesNotExistException extends RuntimeException
+{
+    /**
+     * Static constructor to create an instance from the expected filename.
+     */
+    public static function fromExpectedFile(string $expectedFile): self
+    {
+        return new self(sprintf('File: "%s" does not exist in solution folder', $expectedFile));
+    }
+}

test/Exception/SolutionFileDoesNotExistExceptionTest.php

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+<?php
+
+namespace PhpSchool\PhpWorkshopTest\Exception;
+
+use PhpSchool\PhpWorkshop\Exception\SolutionFileDoesNotExistException;
+use PHPUnit\Framework\TestCase;
+
+class SolutionFileDoesNotExistExceptionTest extends TestCase
+{
+    public function testException(): void
+    {
+        $e =  SolutionFileDoesNotExistException::fromExpectedFile('some-file.csv');
+        $this->assertEquals('File: "some-file.csv" does not exist in solution folder', $e->getMessage());
+    }
+}