string-buffer: Add tests.

* tests/test-string-buffer.c: New file.
* modules/string-buffer-tests: New file.

ChangeLog

@@ -1,5 +1,9 @@
 2021-02-21  Bruno Haible  <bruno@clisp.org>
 
+	string-buffer: Add tests.
+	* tests/test-string-buffer.c: New file.
+	* modules/string-buffer-tests: New file.
+
 	string-buffer: New module.
 	* lib/string-buffer.h: New file.
 	* lib/string-buffer.c: New file.

modules/string-buffer-tests

@@ -0,0 +1,11 @@
+Files:
+tests/test-string-buffer.c
+tests/macros.h
+
+Depends-on:
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-string-buffer
+check_PROGRAMS += test-string-buffer

tests/test-string-buffer.c

@@ -0,0 +1,108 @@
+/* Test of buffer that accumulates a string by piecewise concatenation.
+   Copyright (C) 2021 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 2, 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>, 2021.  */
+
+#include <config.h>
+
+#include "string-buffer.h"
+
+#include <string.h>
+
+#include "macros.h"
+
+static int
+my_appendf (struct string_buffer *buffer, const char *formatstring, ...)
+{
+  va_list args;
+
+  va_start (args, formatstring);
+  int ret = sb_appendvf (buffer, formatstring, args);
+  va_end (args);
+
+  return ret;
+}
+
+char invalid_format_string_1[] = "%&";
+char invalid_format_string_2[] = "%^";
+
+int
+main ()
+{
+  /* Test simple string concatenation.  */
+  {
+    struct string_buffer buffer;
+
+    sb_init (&buffer);
+    char *s = sb_dupfree (&buffer);
+    ASSERT (s != NULL && strcmp (s, "") == 0);
+    free (s);
+  }
+
+  {
+    struct string_buffer buffer;
+
+    sb_init (&buffer);
+    sb_append (&buffer, "abc");
+    sb_append (&buffer, "");
+    sb_append (&buffer, "defg");
+    char *s = sb_dupfree (&buffer);
+    ASSERT (s != NULL && strcmp (s, "abcdefg") == 0);
+    free (s);
+  }
+
+  /* Test printf-like formatting.  */
+  {
+    struct string_buffer buffer;
+
+    sb_init (&buffer);
+    sb_append (&buffer, "<");
+    sb_appendf (&buffer, "%x", 3735928559U);
+    sb_append (&buffer, ">");
+    char *s = sb_dupfree (&buffer);
+    ASSERT (s != NULL && strcmp (s, "<deadbeef>") == 0);
+    free (s);
+  }
+
+  /* Test vprintf-like formatting.  */
+  {
+    struct string_buffer buffer;
+
+    sb_init (&buffer);
+    sb_append (&buffer, "<");
+    my_appendf (&buffer, "%x", 3735928559U);
+    sb_append (&buffer, ">");
+    char *s = sb_dupfree (&buffer);
+    ASSERT (s != NULL && strcmp (s, "<deadbeef>") == 0);
+    free (s);
+  }
+
+  /* Test printf-like formatting failure.  */
+  {
+    struct string_buffer buffer;
+
+    sb_init (&buffer);
+    sb_append (&buffer, "<");
+    sb_appendf (&buffer, invalid_format_string_1, 1);
+    sb_append (&buffer, "|");
+    sb_appendf (&buffer, invalid_format_string_2, 2);
+    sb_append (&buffer, ">");
+    char *s = sb_dupfree (&buffer);
+    ASSERT (s == NULL);
+  }
+
+  return 0;
+}