diff --git a/stack.h b/stack.h
index 3f8746e..eb29c06 100644
--- a/stack.h
+++ b/stack.h
@@ -8,10 +8,12 @@ The latest element is taken from the stack. */
 #include <stdlib.h>
 
 //TODO: passenden Datentyp als struct anlegen
-typedef struct  {
+typedef struct StackNode StackNode;
+
+typedef struct StackNode {
     void* value;
     StackNode* prev;
-} StackNode;
+}StackNode;
 
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data);
diff --git a/stackTests.c b/stackTests.c
new file mode 100644
index 0000000..c64a925
--- /dev/null
+++ b/stackTests.c
@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include "unity/unity.h"
+#include "stack.h"
+
+
+
+void setUp(void){}
+void tearDown(void){}
+
+void TEST_CREATE_STACK(){
+
+     int value = 4;
+     int* ptr = &value;
+    StackNode* stack = push(NULL,ptr);
+
+    TEST_ASSERT_NOT_NULL(stack);
+    TEST_ASSERT_EQUAL_INT(value, *(int*)(stack->value));
+
+}
+
+
+void TEST_STACK_POP() {
+
+    int value1 = 4, value2 = 2;
+    int* ptr = &value1;
+    int* ptr2 = &value2;
+    StackNode* stack = push(NULL,ptr);
+    stack = push(stack,ptr2);
+    stack = pop(stack);
+
+    TEST_ASSERT_EQUAL_INT(value1, *(int*)(stack->value));
+
+}
+
+
+void TEST_STACK_PUSH() {
+
+     int value1 = 4, value2 = 2;
+    int* ptr = &value1;
+    int* ptr2 = &value2;
+    StackNode* stack = push(NULL,ptr);
+    stack = push(stack,ptr2);
+
+    TEST_ASSERT_EQUAL_INT(value2, *(int*)(stack->value));
+}
+
+
+int main(){
+    UNITY_BEGIN();
+
+    printf("\n============================\nstack tests\n============================\n");
+
+    RUN_TEST(TEST_CREATE_STACK);
+    RUN_TEST(TEST_STACK_POP);
+    RUN_TEST(TEST_STACK_PUSH);
+
+    return UNITY_END();
+}
+
+//Befehl zum Kompilieren: gcc stack.c stackTests.c unity/unity.c
\ No newline at end of file