From 9f0191845db87a479a6d4c9038c0c771b81ed688 Mon Sep 17 00:00:00 2001
From: fonkou <fonkoukamtewi@th-nuernberg.de>
Date: Tue, 2 Dec 2025 15:48:32 +0100
Subject: [PATCH] add testStack.c and test_number.c

---
 testStack.c   | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++
 test_number.c |  3 +++
 2 files changed, 76 insertions(+)
 create mode 100644 testStack.c
 create mode 100644 test_number.c

diff --git a/testStack.c b/testStack.c
new file mode 100644
index 0000000..25f89d0
--- /dev/null
+++ b/testStack.c
@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "stack.h"
+
+// Helper: create int on heap
+static int *make_int(int value) {
+    int *p = malloc(sizeof(int));
+    if (!p) {
+        fprintf(stderr, "Memory allocation failed\n");
+        exit(1);
+    }
+    *p = value;
+    return p;
+}
+
+int main(void) {
+
+    printf("Running stack unit tests...\n");
+
+    StackNode *stack = NULL;
+
+    // --- Test 1: push() on empty stack ---
+    int *a = make_int(10);
+    stack = push(stack, a);
+    assert(stack != NULL);
+    assert(top(stack) == a);
+    assert(*(int*)top(stack) == 10);
+
+    // --- Test 2: push() on non-empty stack ---
+    int *b = make_int(20);
+    stack = push(stack, b);
+    assert(top(stack) == b);
+    assert(*(int*)top(stack) == 20);
+
+    // --- Test 3: pop() returns previous element ---
+    stack = pop(stack);  // removes 20
+    assert(top(stack) == a);
+    assert(*(int*)top(stack) == 10);
+
+    // --- Test 4: pop() on single element returns NULL ---
+    stack = pop(stack);  // removes 10
+    assert(stack == NULL);
+
+    // --- Test 5: pop() on empty stack returns NULL ---
+    stack = pop(stack);
+    assert(stack == NULL);
+
+    // --- Test 6: clearStack() empties a multi-element stack ---
+    int *c = make_int(1);
+    int *d = make_int(2);
+    int *e = make_int(3);
+    stack = push(stack, c);
+    stack = push(stack, d);
+    stack = push(stack, e);
+
+    clearStack(stack);
+    // stack pointer still points to old top; we must reset manually
+    stack = NULL;
+
+    // no crash = success
+
+    // free remaining data
+    free(a);
+    free(b);
+    free(c);
+    free(d);
+    free(e);
+
+    printf("All tests passed successfully.\n");
+
+    return 0;
+}
diff --git a/test_number.c b/test_number.c
new file mode 100644
index 0000000..d92535b
--- /dev/null
+++ b/test_number.c
@@ -0,0 +1,3 @@
+//
+// Created by kamtewil on 02.12.2025.
+//
\ No newline at end of file