Implement first test

.gitignore

@@ -1,3 +1,5 @@
 doble_initial
+stackTests
+bintreeTests
 *.o
 *.exe

bintree.c

@@ -68,8 +68,29 @@ TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFc
 // push the top node and push all its left nodes.
 void *nextTreeData(TreeNode *root)
 {
+    static StackNode *stack = NULL;
+    static TreeNode *current = NULL;
 
-}
+    if(root != NULL){
+        clearStack(stack);
+        stack = NULL;
+        current = root;
+    }
+
+    while (current != NULL)
+    {
+        stack = push(stack, current);
+        current = current->left;
+    }
+
+    TreeNode *node = (TreeNode *)top(stack);
+    stack = pop(stack);
+
+    current = node->right;
+
+    return node->data;
+    
+} 
 
 // Releases all memory resources (including data copies).
 void clearTree(TreeNode *root)

bintreeTest.c

@@ -1,8 +1,22 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include "unity.h"
 #include "bintree.h"
 
+int compareInts(const void *arg1, const void *arg2){
+    int val1 = *(int *)arg1;
+    int val2 = *(int *)arg2;
+
+    if(val1 < val2) return 1;
+    if(val1 > val2) return -1;
+    return 0;
+}
+
+int compareStrings(const void *arg1, const void *arg2){
+    return -strcmp((const char *)arg1, (const char *)arg2);
+}
+
 
 void setUp(void){
     //Use if needed    
@@ -11,9 +25,24 @@ void tearDown(void){
     //Use if needed
 }
 
+void test_addToTree_singleElement(void){
+    int value = 42;
+    TreeNode *tree = NULL;
+
+    tree = addToTree(tree, &value, sizeof(int), compareInts, NULL);
+
+    TEST_ASSERT_NOT_NULL(tree);
+    TEST_ASSERT_EQUAL_INT(value, *(int *)tree->data);
+    TEST_ASSERT_NULL(tree->left);
+    TEST_ASSERT_NULL(tree->right);
+}
 int main(){
     UNITY_BEGIN();
 
     printf("\n============================\nBintree tests\n============================\n");
+
+    RUN_TEST(test_addToTree_singleElement);
+
+    return UNITY_END();
     
 }

makefile

@@ -39,6 +39,8 @@ doble_initial:
 # --------------------------
 stackTests: stack.o test_stack.c $(unityfolder)/unity.c
 	$(CC) $(CFLAGS) -I$(unityfolder) -o stackTests test_stack.c stack.o $(unityfolder)/unity.c ${LDFLAGS}
+bintreeTests: bintree.o stack.o bintreeTest.c $(unityfolder)/unity.c
+	$(CC) $(CFLAGS) -I$(unityfolder) -o bintreeTests bintreeTest.c bintree.o stack.o $(unityfolder)/unity.c ${LDFLAGS}
 unitTests:
 	echo "needs to be implemented"
 
@@ -47,7 +49,7 @@ unitTests:
 # --------------------------
 clean:
 ifeq ($(OS),Windows_NT)
-	del /f *.o doble
+	del /f *.o doble doble_initial bintreeTests stackTests
 else
-	rm -f *.o doble
+	rm -f *.o doble doble_initial bintreeTests stackTests
 endif