[PATCH] putenv: Add tests.

[Collin Funk]

* tests/test-putenv.c: New file.
* modules/putenv-tests: New file.
---
 ChangeLog            |  6 +++++
 modules/putenv-tests | 13 ++++++++++
 tests/test-putenv.c  | 61 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 80 insertions(+)
 create mode 100644 modules/putenv-tests
 create mode 100644 tests/test-putenv.c

diff --git a/ChangeLog b/ChangeLog
index 7690099cde..8bccdfd2e1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2024-05-16  Collin Funk  <collin.funk1@gmail.com>
+
+       putenv: Add tests.
+       * tests/test-putenv.c: New file.
+       * modules/putenv-tests: New file.
+
 2024-05-15  Collin Funk  <collin.funk1@gmail.com>
 
        gnulib-tool.py: Don't print tracebacks when Ctrl-C is pressed.
diff --git a/modules/putenv-tests b/modules/putenv-tests
new file mode 100644
index 0000000000..43abb8e6c4
--- /dev/null
+++ b/modules/putenv-tests
@@ -0,0 +1,13 @@
+Files:
+tests/test-putenv.c
+tests/macros.h
+tests/signature.h
+
+Depends-on:
+unsetenv
+
+configure.ac:
+
+Makefile.am:
+TESTS += test-putenv
+check_PROGRAMS += test-putenv
diff --git a/tests/test-putenv.c b/tests/test-putenv.c
new file mode 100644
index 0000000000..1768e7563a
--- /dev/null
+++ b/tests/test-putenv.c
@@ -0,0 +1,61 @@
+/* Test the putenv function.
+   Copyright (C) 2024 Free Software Foundation, Inc.
+
+   This file 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 file 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 Collin Funk <collin.funk1@gmail.com>, 2024.  */
+
+#include <config.h>
+
+/* Specification.  */
+#include <stdlib.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (putenv, int, (char *));
+
+#include <string.h>
+
+#include "macros.h"
+
+int
+main (void)
+{
+  char *ptr;
+
+  /* Verify the environment is clean.  */
+  unsetenv ("TEST_VAR");
+  ASSERT (getenv ("TEST_VAR") == NULL);
+
+  /* Verify adding an environment variable.  */
+  {
+    ASSERT (putenv ("TEST_VAR=abc") == 0);
+    ptr = getenv ("TEST_VAR");
+    ASSERT (ptr != NULL);
+    ASSERT (STREQ (ptr, "abc"));
+  }
+
+  /* Verify removing an environment variable.  */
+  {
+    ASSERT (putenv ("TEST_VAR") == 0);
+    ASSERT (getenv ("TEST_VAR") == NULL);
+  }
+
+  /* Verify the behavior when removing a variable not in the environment.  */
+  {
+    ASSERT (putenv ("TEST_VAR") == 0);
+    ASSERT (getenv ("TEST_VAR") == NULL);
+  }
+
+  return 0;
+}
-- 
2.45.0