Add easycsv_string testing

Signed-off-by: Pradana AUMARS <paumars@courrier.dev>

tests/Makefile.am

@@ -1,11 +1,19 @@
 TESTS = \
-	check_easycsv
+	check_easycsv \
+	check_easycsv_string
 
 noinst_PROGRAMS = \
-	check_easycsv
+	check_easycsv \
+	check_easycsv_string
 
 check_easycsv_SOURCES = \
 	check_easycsv.c
 check_easycsv_CFLAGS = $(CHECK_CFLAGS)
 check_easycsv_LDFLAGS = $(CHECK_LIBS)
 check_easycsv_LDADD = $(top_builddir)/src/libeasycsv.la
+
+check_easycsv_string_SOURCES = \
+	check_easycsv_string.c
+check_easycsv_string_CFLAGS = $(CHECK_CFLAGS)
+check_easycsv_string_LDFLAGS = $(CHECK_LIBS)
+check_easycsv_string_LDADD = $(top_builddir)/src/libeasycsv_string.la

tests/check_easycsv_string.c

@@ -0,0 +1,35 @@
+#include <check.h>
+#include "../src/easycsv_string.h"
+
+START_TEST(test_easycsv_set_charp_to_value)
+{
+  const char* str1 = "test,test,test,test";
+  char* c;
+  c = easycsv_set_charp_to_value(str1, 1);
+  ck_assert_ptr_eq(c, &str1[0]);
+  c = easycsv_set_charp_to_value(str1, 2);
+  ck_assert_ptr_eq(c, &str1[5]);
+}
+
+int
+main(void)
+{
+  int number_failed;
+  SRunner *sr;
+  Suite *s;
+
+  TCase *tc_string;
+  s = suite_create("string manipulation");
+  tc_string = tcase_create("string");
+  tcase_add_test(tc_string, test_easycsv_set_charp_to_value);
+
+  suite_add_tcase(s, tc_string);
+
+  sr = srunner_create(s);
+
+  srunner_run_all(sr, CK_VERBOSE);
+  number_failed = srunner_ntests_failed(sr);
+  srunner_free(sr);
+  return number_failed;
+}
+