added clear top top test

test_stack.c

@@ -3,16 +3,75 @@
 #include "stack.h"
 #include "unity.h"
 
-void test_pop(void)
-{
-    TEST_ASSERT_NULL(pop(NULL));
+StackNode* setup(int value, StackNode* next) {
+    StackNode* node = malloc(sizeof(StackNode)); // allocate memory on heap
+    if (node == NULL) {
+        perror("malloc failed");
+        exit(EXIT_FAILURE); // or handle the error differently
+    }
+    node->value = value;
+    node->next = next;
+    return node;
 }
 
-void setUp(void) {
+void test_pop(void)
+{   
+    StackNode* node2 = setup(3, NULL);
+    StackNode* node1 = setup(2, node2);
+    StackNode* header = setup(1, node1);
+    StackNode* temp;
+
+    temp = pop(header);
+    int after = 0;
+    while(temp) 
+    {
+        after++;
+        temp = temp->next;
+    }
+
+    
+    TEST_ASSERT_EQUAL_INT(2, after);
+    TEST_ASSERT_NULL(node1->next);
+}
+
+void test_top(void)
+{
+    StackNode* node2 = setup(3, NULL);
+    StackNode* node1 = setup(2, node2);
+    StackNode* header = setup(1, node1);
+
+    int data = *(int *)top(header);
+    TEST_ASSERT_EQUAL_INT(node2->value, data);
+}
+
+void test_clear()
+{
+    StackNode* node2 = setup(3, NULL);
+    StackNode* node1 = setup(2, node2);
+    StackNode* header = setup(1, node1);
+    StackNode* temp;
+    
+    clearStack(header);
+    temp = header;
+    
+    int after = 0;
+    while(temp) 
+    {
+        after++;
+        temp = temp->next;
+    }
+
+    
+    TEST_ASSERT_NULL(after);
+}
+
+void setUp(void)
+{
     // Falls notwendig, kann hier Vorbereitungsarbeit gemacht werden
 }
 
-void tearDown(void) {
+void tearDown(void)
+{
     // Hier kann Bereinigungsarbeit nach jedem Test durchgeführt werden
 }
 
@@ -23,6 +82,8 @@ int main()
     printf("============================\nStack tests\n============================\n");
 
     RUN_TEST(test_pop);
+    RUN_TEST(test_top);
+    RUN_TEST(test_clear);
 
     return UNITY_END();
 }