test: check trap error message

3 files changed, 50 insertions, 2 deletions

diff --git a/src/Execution/TrapException.php b/src/Execution/TrapException.php
index 2948e8d..3e6a440 100644
--- a/src/Execution/TrapException.php
+++ b/src/Execution/TrapException.php
@@ -5,7 +5,24 @@ declare(strict_types=1);
 namespace Nsfisis\Waddiwasi\Execution;
 
 use RuntimeException;
+use Throwable;
 
 class TrapException extends RuntimeException
 {
+    private readonly TrapKind $trapKind;
+
+    public function __construct(
+        string $message = "",
+        int $code = 0,
+        ?Throwable $previous = null,
+        TrapKind $trapKind = TrapKind::Unknown,
+    ) {
+        parent::__construct($message, $code, $previous);
+        $this->trapKind = $trapKind;
+    }
+
+    public function getTrapKind(): TrapKind
+    {
+        return $this->trapKind;
+    }
 }
diff --git a/src/Execution/TrapKind.php b/src/Execution/TrapKind.php
new file mode 100644
index 0000000..47c1c77
--- /dev/null
+++ b/src/Execution/TrapKind.php
@@ -0,0 +1,11 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Nsfisis\Waddiwasi\Execution;
+
+enum TrapKind
+{
+    case Unknown;
+    case OutOfBoundsMemoryAccess;
+}
diff --git a/tests/src/SpecTestsuites/SpecTestsuiteBase.php b/tests/src/SpecTestsuites/SpecTestsuiteBase.php
index 72d1a86..1aa37de 100644
--- a/tests/src/SpecTestsuites/SpecTestsuiteBase.php
+++ b/tests/src/SpecTestsuites/SpecTestsuiteBase.php
@@ -8,6 +8,7 @@ use Nsfisis\Waddiwasi\BinaryFormat\Decoder;
 use Nsfisis\Waddiwasi\Execution\Runtime;
 use Nsfisis\Waddiwasi\Execution\Store;
 use Nsfisis\Waddiwasi\Execution\TrapException;
+use Nsfisis\Waddiwasi\Execution\TrapKind;
 use PHPUnit\Framework\TestCase;
 use function count;
 
@@ -84,7 +85,7 @@ abstract class SpecTestsuiteBase extends TestCase
                 $exception = $e;
             }
             $this->assertNotNull($exception, "at $line");
-            // @todo check trap message
+            $this->assertTrapKind($text, $e->getTrapKind(), "at $line");
         } else {
             $this->assertTrue(false, "assert_trap: unknown action, $actionType");
         }
@@ -176,7 +177,7 @@ abstract class SpecTestsuiteBase extends TestCase
         $this->assertCount(
             count($expectedResults),
             $actualResults,
-            "results count mismatch" . $message,
+            'results count mismatch' . $message,
         );
 
         for ($i = 0; $i < count($expectedResults); $i++) {
@@ -222,4 +223,23 @@ abstract class SpecTestsuiteBase extends TestCase
             }
         }
     }
+
+    private function assertTrapKind(
+        string $expectedErrorMessage,
+        TrapKind $kind,
+        string $message = '',
+    ): void {
+        if ($message !== '') {
+            $message = " ($message)";
+        }
+        $actualErrorMessage = match ($kind) {
+            TrapKind::OutOfBoundsMemoryAccess => 'out of bounds memory access',
+            TrapKind::Unknown => 'unknown',
+        };
+        $this->assertSame(
+            $expectedErrorMessage,
+            $actualErrorMessage,
+            'trap kind mismatch' . $message,
+        );
+    }
 }