test-parse-argument: add a test for the three parse_*_argument() functions

This mostly tests the return values and that the xsprintf
buffers are big enough.

src/test/meson.build

@@ -222,6 +222,8 @@ tests += [
 
         [['src/test/test-extract-word.c']],
 
+        [['src/test/test-parse-argument.c']],
+
         [['src/test/test-parse-util.c'],
          [],
          [libseccomp]],

src/test/test-parse-argument.c

@@ -0,0 +1,63 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "parse-argument.h"
+#include "stdio-util.h"
+#include "tests.h"
+
+static void test_parse_json_argument(void) {
+        log_info("/* %s */", __func__);
+
+        JsonFormatFlags flags = JSON_FORMAT_PRETTY;
+
+        assert_se(parse_json_argument("help", &flags) == 0);
+        assert_se(flags == JSON_FORMAT_PRETTY);
+
+        assert_se(parse_json_argument("off", &flags) == 1);
+        assert_se(flags == JSON_FORMAT_OFF);
+}
+
+static void test_parse_path_argument(void) {
+        log_info("/* %s */", __func__);
+
+        _cleanup_free_ char *path = NULL;
+
+        assert_se(parse_path_argument("help", false, &path) == 0);
+        assert_se(streq(basename(path), "help"));
+
+        assert_se(parse_path_argument("/", false, &path) == 0);
+        assert_se(streq(path, "/"));
+
+        assert_se(parse_path_argument("/", true, &path) == 0);
+        assert_se(path == NULL);
+}
+
+static void test_parse_signal_argument(void) {
+        log_info("/* %s */", __func__);
+
+        int  signal = -1;
+
+        assert_se(parse_signal_argument("help", &signal) == 0);
+        assert_se(signal == -1);
+
+        assert_se(parse_signal_argument("list", &signal) == 0);
+        assert_se(signal == -1);
+
+        assert_se(parse_signal_argument("SIGABRT", &signal) == 1);
+        assert_se(signal == SIGABRT);
+
+        assert_se(parse_signal_argument("ABRT", &signal) == 1);
+        assert_se(signal == SIGABRT);
+
+        char buf[DECIMAL_STR_MAX(int)];
+        xsprintf(buf, "%d", SIGABRT);
+        assert_se(parse_signal_argument(buf, &signal) == 1);
+        assert_se(signal == SIGABRT);
+}
+
+int main(int argc, char *argv[]) {
+        test_setup_logging(LOG_INFO);
+
+        test_parse_json_argument();
+        test_parse_path_argument();
+        test_parse_signal_argument();
+}