test: slre: add tests for regex library

Inspecting the slre.c code reveals a few bugs; those are easy to
demonstrate with the new '=~' test operator. Before fixing them, let's
add a place to add test cases.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Rasmus Villemoes <ravi@prevas.dk>

1 files changed, 36 insertions, 0 deletions

diff --git a/test/lib/slre.c b/test/lib/slre.c
new file mode 100644
index 00000000000..51a50b269aa
--- /dev/null
+++ b/test/lib/slre.c
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: GPL-2.0 OR MIT
+
+#include <test/lib.h>
+#include <test/ut.h>
+#include <slre.h>
+
+struct re_test {
+	const char *str;
+	const char *re;
+	int match;
+};
+
+static const struct re_test re_test[] = {
+	{ "123", "^\\d+$", 1},
+	{ "x23", "^\\d+$", 0},
+	{ "banana", "^([bn]a)*$", 1},
+	{ "panama", "^([bn]a)*$", 0},
+	{}
+};
+
+static int lib_slre(struct unit_test_state *uts)
+{
+	const struct re_test *t;
+
+	for (t = re_test; t->str; t++) {
+		struct slre slre;
+
+		ut_assert(slre_compile(&slre, t->re));
+		ut_assertf(!!slre_match(&slre, t->str, strlen(t->str), NULL) == t->match,
+			   "'%s' unexpectedly %s '%s'\n", t->str,
+			   t->match ? "didn't match" : "matched", t->re);
+	}
+
+	return 0;
+}
+LIB_TEST(lib_slre, 0);