Update unittest_1.cpp

Task 1/unittest_1.cpp

@@ -30,10 +30,12 @@ DEFINE_TEST(TestFiberStackAlignment) {
 // Test Fiber Stack Size
 DEFINE_TEST(TestFiberStackSize) {
     Fiber testFiber([](Context*, Context*){});
-    char* stackBottom = reinterpret_cast<char*>(testFiber.context.rsp);
-    char* stackTop = testFiber.stack;
+    char* stackBottom = testFiber.stack_bottom_; // Assuming stack_bottom_ points to the beginning of the stack
+    char* stackTop = testFiber.stack_top_; // stack_top_ should point to the top of the stack (end of allocation)
 
-    TEST_EQ(stackTop - stackBottom, StackSize - 128);  // Check for expected stack size accounting for Red Zone
+    // Since stack grows downwards, stackTop should be a smaller address than stackBottom
+    int actualStackSize = stackBottom - stackTop;
+    TEST_EQ(actualStackSize, StackSize - 128);  // Check for expected stack size accounting for Red Zone
 }
 
 // Test Fiber Context Initialization