diff --git a/c_pointers/getline_test.c b/c_pointers/getline_test.c
new file mode 100644
index 0000000..34fed55
--- /dev/null
+++ b/c_pointers/getline_test.c
@@ -0,0 +1,54 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include "minunit.h"
+#include "getline.h"
+
+ 
+#define STRING_LENGTH 14
+
+
+
+int tests_run = 0;
+
+
+// unit test function for trim()
+static char *test_trim() {
+
+    char *foo = malloc(STRING_LENGTH + 1 * sizeof(*foo));
+    int wurst = snprintf(foo, STRING_LENGTH + 1, "%s", "    hallo welt");
+    
+    assertf(wurst <= STRING_LENGTH, "buffer overflow");
+
+    mu_assert("error", !(strcmp(trim(foo), "hallo welt")));
+    
+    return 0;
+
+}
+
+
+// function to run all tests
+static char *all_tests() {
+
+    mu_run_test(test_trim);
+
+    return 0;
+
+}
+
+
+int main(void) {
+
+    char *result = all_tests();
+    
+    if (result != 0) {
+        printf("%s\n", result);
+    } else {
+        printf("ALL TESTS PASSED\n");
+    }
+
+    printf("Tests run: %d\n", tests_run);
+
+    return result != 0;
+}
\ No newline at end of file