Add comprehensive tests for Coroutine::getTrace() method

Co-authored-by: EdmondDantes <1571649+EdmondDantes@users.noreply.github.com>

Author: Copilot

tests/coroutine/009-coroutine_getTrace.phpt

@@ -1,20 +1,39 @@
 --TEST--
-Coroutine: getTrace() - returns empty array (TODO implementation)
+Coroutine: getTrace() - returns empty array for non-suspended coroutine
 --FILE--
 <?php
 
 use function Async\spawn;
+use function Async\await;
 
 $coroutine = spawn(function() {
     return "test";
 });
 
+// Wait for coroutine to complete
+await($coroutine);
+
+// After completion, trace should be empty
 $trace = $coroutine->getTrace();
 
 var_dump(is_array($trace));
 var_dump(count($trace));
 
+// Test with options parameter
+$trace2 = $coroutine->getTrace(DEBUG_BACKTRACE_IGNORE_ARGS);
+var_dump(is_array($trace2));
+var_dump(count($trace2));
+
+// Test with limit parameter
+$trace3 = $coroutine->getTrace(DEBUG_BACKTRACE_PROVIDE_OBJECT, 5);
+var_dump(is_array($trace3));
+var_dump(count($trace3));
+
 ?>
 --EXPECT--
 bool(true)
+int(0)
+bool(true)
+int(0)
+bool(true)
 int(0)

tests/coroutine/037-coroutine_getTrace_suspended.phpt

@@ -0,0 +1,44 @@
+--TEST--
+Coroutine: getTrace() - returns backtrace for suspended coroutine
+--FILE--
+<?php
+
+use function Async\spawn;
+use function Async\await;
+
+$coroutine = spawn(function() {
+    // This function will suspend
+    Async\sleep(0.1);
+    return "test";
+});
+
+// Get trace while coroutine is suspended
+$trace = $coroutine->getTrace();
+
+var_dump(is_array($trace));
+echo "Trace has entries: " . (count($trace) > 0 ? "yes" : "no") . "\n";
+
+// Test with DEBUG_BACKTRACE_IGNORE_ARGS
+$traceNoArgs = $coroutine->getTrace(DEBUG_BACKTRACE_IGNORE_ARGS);
+var_dump(is_array($traceNoArgs));
+
+// Test with limit
+$traceLimited = $coroutine->getTrace(DEBUG_BACKTRACE_PROVIDE_OBJECT, 2);
+var_dump(is_array($traceLimited));
+
+// Wait for coroutine to complete
+await($coroutine);
+
+// After completion, trace should be empty
+$traceAfter = $coroutine->getTrace();
+var_dump(is_array($traceAfter));
+var_dump(count($traceAfter) === 0);
+
+?>
+--EXPECTF--
+bool(true)
+Trace has entries: %s
+bool(true)
+bool(true)
+bool(true)
+bool(true)