Unit Tests für den Stack erstellt

I2_Dobble/stack.c

@@ -1,7 +1,7 @@
 #include <stdlib.h>
 #include "stack.h"
 
-//TODO: grundlegende Stackfunktionen implementieren:
+//DONE: grundlegende Stackfunktionen implementieren:
 /*  * `push`: legt ein Element oben auf den Stack,
     * `pop`: entfernt das oberste Element,
     * `top`: liefert das oberste Element zurück,
@@ -10,12 +10,12 @@
 // Pushes data as pointer onto the stack.
 StackNode *push(StackNode *stack, void *data)
 {
-    //        ,-→ Wenn keine Daten angegeben wird die Liste unverändert zurückgegeben; Ist das sinnvoll? kein Anzeichen, kein Rückgabewert...
+    //        ,-→ Wenn keine Daten angegeben wird die Liste unverändert zurückgegeben
     if (data != NULL)
     {
         StackNode *newNode;
         newNode = (StackNode *)malloc(sizeof(StackNode));
-        newNode->value = data;
+        newNode->data = data;
         
         //         ,-→ bedeutet Liste war leer - das neue Element hat keinen Nachfolger (next = NULL)
         if (stack == NULL) {
@@ -25,11 +25,12 @@ StackNode *push(StackNode *stack, void *data)
         }
         stack = newNode;
     }
+    
     return stack;
 }
 
-// Deletes the top element of the stack (latest added element) and releases its memory. (Pointer to data has to be
+// Deletes the top element of the stack (latest added element) and releases its memory.
-// freed by caller.)
+// (Pointer to data has to be freed by caller.)
 StackNode *pop(StackNode *stack)
 {
     if(stack != NULL)
@@ -44,7 +45,11 @@ StackNode *pop(StackNode *stack)
 // Returns the data of the top element.
 void *top(StackNode *stack)
 {
-    return stack->value;
+    if (stack != NULL) {
+        return stack->data;
+    } else {
+        return NULL;
+    } 
 }
 
 // Clears stack and releases all memory.

I2_Dobble/stack.h

@@ -10,7 +10,7 @@ The latest element is taken from the stack. */
 //DONE: passenden Datentyp als struct anlegen
 typedef struct Node
 {
-  void *value;
+  void *data;
   struct Node* next;
 } StackNode;
 

I2_Dobble/stackTest.c

@@ -0,0 +1,167 @@
+#include "stack.h"
+#include "unity/unity.h"
+#include "unity/unity_internals.h"
+
+/* wird nicht mehr gebraucht
+
+// Ein Blick in den Stack - listet den Stack-Inhalt der Reihe nach auf
+void inspectStack(StackNode *stack)
+{    
+    if (stack != NULL)
+    {
+        printf("Der Stack enthält die folgenden Elemente: %d", *(int*)stack->data);
+        while (stack->next != NULL)
+        {
+            printf(" %d", *(int*)stack->next->data);
+            stack = stack->next;
+        }
+        putchar('\n');
+    }
+    else
+    {
+        printf("Der Stack ist leer\n");
+    }
+}
+*/
+
+// Setup-Funktionen von Unity, die zumindest als Platzhalter definiert sein müssen
+void setUp(void) {};
+void tearDown(void) {};
+
+void test_createNodeAbortsOnZeroData(void)
+{
+    void *data = NULL;
+    StackNode *stack = NULL;
+    stack = push(stack, data);
+    TEST_ASSERT_EQUAL_PTR(stack, NULL);
+
+    clearStack(stack);
+}
+
+void test_createdNodeIsFirstInList(void)
+{
+    int data = 42;
+    StackNode *stack = NULL;
+    stack = push(stack, &data);
+    TEST_ASSERT_NOT_NULL(stack);
+    TEST_ASSERT_EQUAL_PTR(&data, stack->data);
+    TEST_ASSERT_NULL(stack->next);
+
+    clearStack(stack);
+}
+
+void test_createNodeCorrectOrder(void)
+{
+    int data[3] = {0, 1, 2};
+    StackNode *stack = NULL;
+    stack = push(stack, &data[2]);
+    stack = push(stack, &data[1]);
+    stack = push(stack, &data[0]);
+
+    TEST_ASSERT_NOT_NULL(stack);
+    TEST_ASSERT_EQUAL_PTR(&data[0], stack->data);
+    TEST_ASSERT_EQUAL_PTR(&data[1], stack->next->data);
+    TEST_ASSERT_EQUAL_PTR(&data[2], stack->next->next->data);
+    TEST_ASSERT_NULL(stack->next->next->next);
+
+    clearStack(stack);
+}
+
+void test_removeNodeAbortsOnZero(void)
+{
+    StackNode *stack = NULL;
+    TEST_ASSERT_NULL(pop(stack));
+
+    clearStack(stack);
+}
+
+void test_removeOnlyNodeEmptysList(void)
+{
+    int data = 42;
+    StackNode *stack = NULL;
+    stack = pop(push(stack, &data));
+
+    TEST_ASSERT_NULL(stack);
+
+    clearStack(stack);
+}
+
+void test_removeNodeRemovesFirst(void)
+{
+    int data[2] = {0, 1};
+    StackNode *stack = NULL;
+    stack = push(stack, &data[1]);
+    stack = push(stack, &data[0]);
+    stack = pop(stack);
+
+    TEST_ASSERT_NOT_NULL(stack);
+    TEST_ASSERT_EQUAL_PTR(&data[1], stack->data);
+    TEST_ASSERT_NULL(stack->next);
+
+    clearStack(stack);
+}
+
+void test_outputTopFailsOnZero(void)
+{
+    StackNode *stack = NULL;
+    
+    TEST_ASSERT_NULL(top(stack));
+
+    clearStack(stack);
+}
+
+void test_outputTopCorrect(void)
+{
+    int data[2] = {0, 1};
+    StackNode *stack = NULL;
+    stack = push(stack, &data[1]);
+    stack = push(stack, &data[0]);
+
+    TEST_ASSERT_NOT_NULL(stack);
+    TEST_ASSERT_EQUAL_PTR(top(stack), stack->data);
+
+    clearStack(stack);
+}
+
+
+/* Speicher freigabe lässt sich nicht mit Unity testen, am besten Programm mit valgrind ausführen
+void test_clearStackFreesMemory(void)
+{
+    int data[2] = {22, 17};
+    StackNode *lowNode = (StackNode *)malloc(sizeof(StackNode));
+    lowNode->next = NULL;
+    lowNode->data = &data[0];
+    StackNode *highNode = (StackNode *)malloc(sizeof(StackNode));
+    highNode->next = lowNode;
+    highNode->data = &data[1];
+    StackNode *stack = highNode;
+
+    clearStack(stack);
+
+    TEST_ASSERT_NULL(lowNode);
+    TEST_ASSERT_NULL(highNode);
+    TEST_ASSERT_NULL(stack);
+}
+*/
+
+int main()
+{
+    UNITY_BEGIN();
+
+    printf("\n============================\n Stack tests\n============================\n");
+    printf("-> Create Nodes (push)\n");
+    RUN_TEST(test_createNodeAbortsOnZeroData);
+    RUN_TEST(test_createdNodeIsFirstInList);
+    RUN_TEST(test_createNodeCorrectOrder);
+
+    printf("\n-> Remove Nodes (pop)\n");
+    RUN_TEST(test_removeNodeAbortsOnZero);
+    RUN_TEST(test_removeOnlyNodeEmptysList);
+    RUN_TEST(test_removeNodeRemovesFirst);
+
+    printf("\n-> Output Top (top)\n");
+    RUN_TEST(test_outputTopFailsOnZero);
+    RUN_TEST(test_outputTopCorrect);
+
+    return UNITY_END();
+}