test-core-unit: add new test file for unit_escape_setting() and friends

None of the existing test files fit very well. test-unit-serialize is
pretty close, but it does special cgroup setup, which we don't need in
this case. I hope we can add more tests in the future for this basic
functionality, so I'm adding a brand new file names after the source file
it's testing.

src/test/meson.build

@@ -474,6 +474,11 @@ tests += [
                 'sources' : files('test-chown-rec.c'),
                 'base' : test_core_base,
         },
+        {
+                'sources' : files('test-core-unit.c'),
+                'dependencies' : common_test_dependencies,
+                'base' : test_core_base,
+        },
         {
                 'sources' : files('test-emergency-action.c'),
                 'base' : test_core_base,

src/test/test-core-unit.c

@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "escape.h"
+#include "tests.h"
+#include "unit.h"
+
+static void test_unit_escape_setting_one(
+                const char *s,
+                const char *expected_exec,
+                const char *expected_c) {
+
+        _cleanup_free_ char *a = NULL, *b, *c,
+                *s_esc, *a_esc, *b_esc, *c_esc;
+        const char *t;
+
+        if (!expected_exec)
+                expected_exec = s;
+        if (!expected_c)
+                expected_c = expected_exec;
+        assert_se(s_esc = cescape(s));
+
+        assert_se(t = unit_escape_setting(s, 0, &a));
+        assert_se(a_esc = cescape(t));
+        log_debug("%s: [%s] → [%s]", __func__, s_esc, a_esc);
+        assert_se(a == NULL);
+        assert_se(t == s);
+
+        assert_se(t = unit_escape_setting(s, UNIT_ESCAPE_EXEC_SYNTAX, &b));
+        assert_se(b_esc = cescape(t));
+        log_debug("%s: [%s] → [%s]", __func__, s_esc, b_esc);
+        assert_se(b == NULL || streq(b, t));
+        assert_se(streq(t, expected_exec));
+
+        assert_se(t = unit_escape_setting(s, UNIT_ESCAPE_C, &c));
+        assert_se(c_esc = cescape(t));
+        log_debug("%s: [%s] → [%s]", __func__, s_esc, c_esc);
+        assert_se(c == NULL || streq(c, t));
+        assert_se(streq(t, expected_c));
+}
+
+TEST(unit_escape_setting) {
+        test_unit_escape_setting_one("/sbin/sbash", NULL, NULL);
+        test_unit_escape_setting_one("$", "\\$", "$");
+        test_unit_escape_setting_one("$$", "\\$\\$", "$$");
+        test_unit_escape_setting_one("'", "\\'", NULL);
+        test_unit_escape_setting_one("\"", "\\\"", NULL);
+        test_unit_escape_setting_one("\t", "\\t", NULL);
+        test_unit_escape_setting_one(" ", NULL, NULL);
+        test_unit_escape_setting_one("$;'\"\t\n", "\\$\\;\\'\\\"\\t\\n", "$;\\'\\\"\\t\\n");
+}
+
+static void test_unit_concat_strv_one(
+                char **s,
+                const char *expected_none,
+                const char *expected_exec,
+                const char *expected_c) {
+
+        _cleanup_free_ char *a, *b, *c,
+                *s_ser, *s_esc, *a_esc, *b_esc, *c_esc;
+
+        assert_se(s_ser = strv_join(s, "_"));
+        assert_se(s_esc = cescape(s_ser));
+        if (!expected_exec)
+                expected_exec = expected_none;
+        if (!expected_c)
+                expected_c = expected_none;
+
+        assert_se(a = unit_concat_strv(s, 0));
+        assert_se(a_esc = cescape(a));
+        log_debug("%s: [%s] → [%s]", __func__, s_esc, a_esc);
+        assert_se(streq(a, expected_none));
+
+        assert_se(b = unit_concat_strv(s, UNIT_ESCAPE_EXEC_SYNTAX));
+        assert_se(b_esc = cescape(b));
+        log_debug("%s: [%s] → [%s]", __func__, s_esc, b_esc);
+        assert_se(streq(b, expected_exec));
+
+        assert_se(c = unit_concat_strv(s, UNIT_ESCAPE_C));
+        assert_se(c_esc = cescape(c));
+        log_debug("%s: [%s] → [%s]", __func__, s_esc, c_esc);
+        assert_se(streq(c, expected_c));
+}
+
+TEST(unit_concat_strv) {
+        test_unit_concat_strv_one(STRV_MAKE("a", "b", "c"),
+                                  "\"a\" \"b\" \"c\"",
+                                  NULL,
+                                  NULL);
+        test_unit_concat_strv_one(STRV_MAKE("a", " ", "$", "$$", ""),
+                                  "\"a\" \" \" \"$\" \"$$\" \"\"",
+                                  "\"a\" \" \" \"\\$\" \"\\$\\$\" \"\"",
+                                  NULL);
+        test_unit_concat_strv_one(STRV_MAKE("\n", " ", "\t"),
+                                  "\"\n\" \" \" \"\t\"",
+                                  "\"\\n\" \" \" \"\\t\"",
+                                  "\"\\n\" \" \" \"\\t\"");
+}
+
+DEFINE_TEST_MAIN(LOG_DEBUG);