tests: separate tunit tests from unit tests more

- unit tests need no tool code as they are libcurl unit tests
- unit test 1621 is now tunit test 1621 instead, as it tests tool code
- build unit tests with BUILDING_LIBCURL as they pretent to be libcurl

Closes #17259

tests/tunit/Makefile.inc

@@ -29,8 +29,10 @@ FIRSTFILES = ../libtest/first.c
 TOOLFILES = $(FIRSTFILES)
 
 # These are all tool unit test programs
-TOOLPROGS = tool1394 tool1604
+TOOLPROGS = tool1394 tool1604 tool1621
 
 tool1394_SOURCES = tool1394.c $(TOOLFILES)
 
 tool1604_SOURCES = tool1604.c $(TOOLFILES)
+
+tool1621_SOURCES = tool1621.c $(TOOLFILES)

tests/tunit/tool1621.c

@@ -0,0 +1,81 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+#include "curlcheck.h"
+
+#include "urldata.h"
+#include "url.h"
+
+#include "memdebug.h" /* LAST include file */
+
+static CURLcode unit_setup(void)
+{
+  return CURLE_OK;
+}
+
+static void unit_stop(void)
+{
+}
+
+#if defined(__MINGW32__)  || \
+  (!defined(HAVE_FSETXATTR) && \
+  (!defined(__FreeBSD_version) || (__FreeBSD_version < 500000)))
+UNITTEST_START
+UNITTEST_STOP
+#else
+
+char *stripcredentials(const char *url);
+
+struct checkthis {
+  const char *input;
+  const char *output;
+};
+
+static const struct checkthis tests[] = {
+  { "ninja://foo@example.com", "ninja://foo@example.com" },
+  { "https://foo@example.com", "https://example.com/" },
+  { "https://localhost:45", "https://localhost:45/" },
+  { "https://foo@localhost:45", "https://localhost:45/" },
+  { "http://daniel:password@localhost", "http://localhost/" },
+  { "http://daniel@localhost", "http://localhost/" },
+  { "http://localhost/", "http://localhost/" },
+  { NULL, NULL } /* end marker */
+};
+
+UNITTEST_START
+{
+  int i;
+
+  for(i = 0; tests[i].input; i++) {
+    const char *url = tests[i].input;
+    char *stripped = stripcredentials(url);
+    printf("Test %u got input \"%s\", output: \"%s\"\n",
+           i, tests[i].input, stripped);
+
+    fail_if(stripped && strcmp(tests[i].output, stripped),
+            tests[i].output);
+    curl_free(stripped);
+  }
+}
+UNITTEST_STOP
+#endif