Add unit test file test_stack.c

test_stack.c

@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "stack.h"
+
+// Hilfsfunktion: beendet Programm bei malloc-Fehler
+int *make_int(int value)
+{
+    int *p = malloc(sizeof(int));
+    assert(p != NULL);
+    *p = value;
+    return p;
+}
+
+// Test: Push und Top.
+void test_push_and_top()
+{
+    printf("Running test_push_and_top...\n");
+
+    StackNode *stack = NULL;
+
+    int *a = make_int(10);
+    int *b = make_int(20);
+
+    stack = push(stack, a);
+    stack = push(stack, b);
+
+    int *topValue = (int *)top(stack);
+    assert(topValue != NULL);
+    assert(*topValue == 20);
+
+    clearStack(stack);
+    free(a);
+    free(b);
+
+    printf(" test_push_and_top passed\n");
+}
+
+// Test: Pop in korrekter Reihenfolge
+void test_push_pop_sequence()
+{
+    printf("Running test_push_pop_sequence...\n");
+
+    StackNode *stack = NULL;
+
+    int *a = make_int(1);
+    int *b = make_int(2);
+    int *c = make_int(3);
+
+    stack = push(stack, a);
+    stack = push(stack, b);
+    stack = push(stack, c);
+
+    // Pop 3
+    int *v = (int *)top(stack);
+    assert(*v == 3);
+    stack = pop(stack);
+
+    // Pop 2
+    v = (int *)top(stack);
+    assert(*v == 2);
+    stack = pop(stack);
+
+    // Pop 1
+    v = (int *)top(stack);
+    assert(*v == 1);
+    stack = pop(stack);
+
+    // Stack sollte leer sein
+    assert(stack == NULL);
+
+    free(a);
+    free(b);
+    free(c);
+
+    printf(" test_push_pop_sequence passed\n");
+}
+
+// Test: clearStack
+void test_clearStack()
+{
+    printf("Running test_clearStack...\n");
+
+    StackNode *stack = NULL;
+
+    for (int i = 0; i < 5; i++)
+        stack = push(stack, make_int(i));
+
+    clearStack(stack);
+
+    // danach ist Stack nur als "gelöscht" markiert,
+// aber Pointer ist nicht automatisch NULL → das prüft man so:
+    stack = NULL;
+
+    printf(" test_clearStack passed\n");
+}
+
+int main()
+{
+    printf("=== Running Stack Unit Tests ===\n");
+
+    test_push_and_top();
+    test_push_pop_sequence();
+    test_clearStack();
+
+    printf("=== All tests passed successfully! ===\n");
+
+    return 0;
+}