add numbers.c test

test_numbers.c

@@ -1,6 +1,7 @@
 #include "unity.h"
 #include "numbers.h"
 #include "stdlib.h"
+#include "string.h"
 
 static int compareInt(const void *ptr1, const void *ptr2);
 
@@ -48,13 +49,29 @@ void test_for_triple(void)
         unsigned int *numbers = createNumbers(3);
         if (numbers[0] == numbers[1] && numbers[1] == numbers[2])
         {
-            // fail the test
+            TEST_FAIL_MESSAGE("triple generated");
-            TEST_ASSERT(0);
         }
         free(numbers);
     }
 }
 
+// check if getDuplicate() modifies the original array (it should not)
+void test_get_duplicate_does_modify()
+{
+    unsigned int arr1[] = {1, 2, 3, 4, 5, 4, 3, 2, 1}; // sorting would change this
+    size_t len1 = sizeof(arr1) / sizeof(arr1[0]);
+    unsigned int arr1Copy[5];
+    memcpy(arr1Copy, arr1, len1);
+
+    getDuplicate(arr1, len1); // return value does not matter
+
+    // check if the arrays are still the same
+    if (memcmp(arr1, arr1Copy, len1))
+    {
+        TEST_FAIL_MESSAGE("Arrays have diverged");
+    }
+}
+
 // checks if there is exactly 1 duplicate number at varying array sizes
 void test_exactly_one_duplicate()
 {
@@ -105,5 +122,6 @@ int main(void)
     RUN_TEST(test_for_triple);
     RUN_TEST(test_exactly_one_duplicate);
     RUN_TEST(test_get_duplicate);
+    RUN_TEST(test_get_duplicate_does_modify);
     return UNITY_END();
 }