xstring-desc: Add tests.

* tests/test-xstring-desc.c: New file.
* modules/xstring-desc-tests: New file.

ChangeLog

@@ -1,5 +1,9 @@
 2023-03-28  Bruno Haible  <bruno@clisp.org>
 
+	xstring-desc: Add tests.
+	* tests/test-xstring-desc.c: New file.
+	* modules/xstring-desc-tests: New file.
+
 	xstring-desc: New module.
 	* lib/xstring-desc.h: New file.
 	* lib/xstring-desc.c: New file.

modules/xstring-desc-tests

@@ -0,0 +1,12 @@
+Files:
+tests/test-xstring-desc.c
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-xstring-desc
+check_PROGRAMS += test-xstring-desc
+test_xstring_desc_LDADD = $(LDADD) @LIBINTL@

tests/test-xstring-desc.c

@@ -0,0 +1,84 @@
+/* Test of string descriptors.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2023.  */
+
+#include <config.h>
+
+#include "xstring-desc.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+  string_desc_t s0 = string_desc_new_empty ();
+  string_desc_t s1 = string_desc_from_c ("Hello world!");
+  string_desc_t s2 = string_desc_new_addr (21, "The\0quick\0brown\0\0fox");
+
+  /* Test xstring_desc_new.  */
+  string_desc_t s4 = xstring_desc_new (5);
+  string_desc_set_char_at (s4, 0, 'H');
+  string_desc_set_char_at (s4, 4, 'o');
+  string_desc_set_char_at (s4, 1, 'e');
+  string_desc_fill (s4, 2, 4, 'l');
+  ASSERT (string_desc_length (s4) == 5);
+  ASSERT (string_desc_startswith (s1, s4));
+
+  /* Test xstring_desc_new_filled.  */
+  string_desc_t s5 = xstring_desc_new_filled (5, 'l');
+  string_desc_set_char_at (s5, 0, 'H');
+  string_desc_set_char_at (s5, 4, 'o');
+  string_desc_set_char_at (s5, 1, 'e');
+  ASSERT (string_desc_length (s5) == 5);
+  ASSERT (string_desc_startswith (s1, s5));
+
+  /* Test xstring_desc_copy.  */
+  {
+    string_desc_t s6 = xstring_desc_copy (s0);
+    ASSERT (string_desc_is_empty (s6));
+    string_desc_free (s6);
+  }
+  {
+    string_desc_t s6 = xstring_desc_copy (s2);
+    ASSERT (string_desc_equals (s6, s2));
+    string_desc_free (s6);
+  }
+
+  /* Test xstring_desc_concat.  */
+  {
+    string_desc_t s8 =
+      xstring_desc_concat (3, string_desc_new_addr (10, "The\0quick"),
+                              string_desc_new_addr (7, "brown\0"),
+                              string_desc_new_addr (4, "fox"),
+                              string_desc_new_addr (7, "unused"));
+    ASSERT (string_desc_equals (s8, s2));
+    string_desc_free (s8);
+  }
+
+  /* Test xstring_desc_c.  */
+  {
+    char *ptr = xstring_desc_c (s2);
+    ASSERT (ptr != NULL);
+    ASSERT (memcmp (ptr, "The\0quick\0brown\0\0fox\0", 22) == 0);
+    free (ptr);
+  }
+
+  return 0;
+}