[PATCH v4 7/8] lib/tests: add kunit tests for glob_match_nocase() and glob_validate()

[Josh Law <objecting@objecting.org>]

Add parameterized test cases for the new glob API functions:

glob_match_nocase() tests verify case-insensitive matching for
  literal characters, wildcards, character class ranges, and
  backslash escapes -- e.g., pattern "a*c" matches string "ABC",
  and range [A-Z] matches lowercase 'm'.

glob_validate() tests verify detection of malformed patterns:
  well-formed patterns (character classes, escapes, wildcards) return
  true, while unclosed brackets ("[abc") and trailing backslashes
  ("abc\") return false.

Signed-off-by: Josh Law <objecting@objecting.org>
---
 lib/tests/glob_kunit.c | 77 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/lib/tests/glob_kunit.c b/lib/tests/glob_kunit.c
index 9b53060e7c8e..711cb44d1fc8 100644
--- a/lib/tests/glob_kunit.c
+++ b/lib/tests/glob_kunit.c
@@ -157,8 +157,85 @@ static void glob_test_match(struct kunit *test)
 			    params->pat, params->str, params->expected);
 }
 
+/* Case-insensitive matching tests */
+static const struct glob_test_case glob_nocase_test_cases[] = {
+	{ .pat = "abc", .str = "ABC", .expected = true },
+	{ .pat = "ABC", .str = "abc", .expected = true },
+	{ .pat = "aBc", .str = "AbC", .expected = true },
+	{ .pat = "a*c", .str = "ABC", .expected = true },
+	{ .pat = "A?C", .str = "abc", .expected = true },
+	{ .pat = "[A-Z]", .str = "m", .expected = true },
+	{ .pat = "[a-z]", .str = "M", .expected = true },
+	{ .pat = "abc", .str = "abd", .expected = false },
+	{ .pat = "ABC", .str = "ABD", .expected = false },
+	{ .pat = "a*z", .str = "ABZ", .expected = true },
+	{ .pat = "\\A", .str = "a", .expected = true },
+};
+
+KUNIT_ARRAY_PARAM(glob_nocase, glob_nocase_test_cases, glob_case_to_desc);
+
+static void glob_test_match_nocase(struct kunit *test)
+{
+	const struct glob_test_case *params = test->param_value;
+
+	KUNIT_EXPECT_EQ_MSG(test,
+			    glob_match_nocase(params->pat, params->str),
+			    params->expected,
+			    "nocase Pattern: \"%s\", String: \"%s\", Expected: %d",
+			    params->pat, params->str, params->expected);
+}
+
+/* Pattern validation tests */
+struct glob_validate_case {
+	const char *pat;
+	bool expected;
+};
+
+static const struct glob_validate_case glob_validate_test_cases[] = {
+	{ .pat = "abc", .expected = true },
+	{ .pat = "*", .expected = true },
+	{ .pat = "?", .expected = true },
+	{ .pat = "[abc]", .expected = true },
+	{ .pat = "[!abc]", .expected = true },
+	{ .pat = "[^abc]", .expected = true },
+	{ .pat = "[a-z]", .expected = true },
+	{ .pat = "[]abc]", .expected = true },
+	{ .pat = "\\*", .expected = true },
+	{ .pat = "\\\\", .expected = true },
+	{ .pat = "", .expected = true },
+	/* Invalid patterns */
+	{ .pat = "[", .expected = false },
+	{ .pat = "[abc", .expected = false },
+	{ .pat = "[!abc", .expected = false },
+	{ .pat = "abc\\", .expected = false },
+	{ .pat = "\\", .expected = false },
+	{ .pat = "abc[def", .expected = false },
+};
+
+static void glob_validate_case_to_desc(const struct glob_validate_case *t,
+				       char *desc)
+{
+	snprintf(desc, KUNIT_PARAM_DESC_SIZE, "pat:\"%s\"", t->pat);
+}
+
+KUNIT_ARRAY_PARAM(glob_validate, glob_validate_test_cases,
+		  glob_validate_case_to_desc);
+
+static void glob_test_validate(struct kunit *test)
+{
+	const struct glob_validate_case *params = test->param_value;
+
+	KUNIT_EXPECT_EQ_MSG(test,
+			    glob_validate(params->pat),
+			    params->expected,
+			    "validate Pattern: \"%s\", Expected: %d",
+			    params->pat, params->expected);
+}
+
 static struct kunit_case glob_kunit_test_cases[] = {
 	KUNIT_CASE_PARAM(glob_test_match, glob_gen_params),
+	KUNIT_CASE_PARAM(glob_test_match_nocase, glob_nocase_gen_params),
+	KUNIT_CASE_PARAM(glob_test_validate, glob_validate_gen_params),
 	{}
 };
 
-- 
2.34.1