tests: lib: json: add test for mixed array types

Add tests for encoding, parsing and calculating length mixed array
types.

Signed-off-by: Sanjay Vallimanalan <sanjay@linumiz.com>

Author: SanjayyyV

tests/lib/json/src/main.c

@@ -348,6 +348,28 @@ static const struct json_obj_descr enums_descr[] = {
 	JSON_OBJ_DESCR_PRIM(struct test_enums, u32, JSON_TOK_UINT),
 };
 
+struct test_mixed_arr {
+	const char *msg_type;
+	uint64_t dev_id;
+	struct test_nested nested;
+	int arr[3];
+	size_t arr_len;
+	char status_buf[10];
+	size_t count;
+};
+
+static const struct json_obj_descr test_mixed_arr_descr_arr[] = {
+	JSON_OBJ_DESCR_ARRAY(struct test_mixed_arr, arr, 3, arr_len, JSON_TOK_NUMBER),
+};
+
+static const struct json_mixed_arr_descr test_mixed_arr_descr[] = {
+	JSON_MIXED_ARR_DESCR_PRIM(struct test_mixed_arr, msg_type, JSON_TOK_STRING, count),
+	JSON_MIXED_ARR_DESCR_PRIM(struct test_mixed_arr, dev_id, JSON_TOK_UINT64, count),
+	JSON_MIXED_ARR_DESCR_OBJECT(struct test_mixed_arr, nested, nested_descr, count),
+	JSON_MIXED_ARR_DESCR_ARRAY(struct test_mixed_arr, arr, 3, test_mixed_arr_descr_arr, count),
+	JSON_MIXED_ARR_DESCR_PRIM(struct test_mixed_arr, status_buf, JSON_TOK_STRING_BUF, count),
+};
+
 
 ZTEST(lib_json_test, test_json_encoding)
 {
@@ -2198,4 +2220,110 @@ ZTEST(lib_json_test, test_json_string_nullptr)
 	zassert_str_equal(ts.some_string, "", "String not decoded correctly");
 }
 
+ZTEST(lib_json_test, test_json_mixed_arr_parse)
+{
+	struct test_mixed_arr arr = {0};
+	char json[] = "[\"msg\", 123456, {\"nested_int\":42,\"nested_bool\":true,"
+		      "\"nested_string\":\"abc\","
+		      "\"nested_string_buf\":\"buf\",\"nested_int8\":1,\"nested_uint8\":2,"
+		      "\"nested_int64\":3,\"nested_uint64\":4}, [10,20,30], \"ok\"]";
+	int ret = json_mixed_arr_parse(json, strlen(json),
+				       test_mixed_arr_descr,
+				       ARRAY_SIZE(test_mixed_arr_descr), &arr);
+
+	zassert_equal(ret, 5, "Should parse 5 elements");
+	zassert_str_equal(arr.msg_type, "msg", NULL);
+	zassert_equal(arr.dev_id, 123456, NULL);
+	zassert_equal(arr.nested.nested_int, 42, NULL);
+	zassert_equal(arr.arr_len, 3, NULL);
+	zassert_equal(arr.arr[0], 10, NULL);
+	zassert_equal(arr.arr[1], 20, NULL);
+	zassert_equal(arr.arr[2], 30, NULL);
+	zassert_str_equal(arr.status_buf, "ok", NULL);
+}
+
+ZTEST(lib_json_test, test_json_mixed_arr_encode)
+{
+	char buf[256];
+	struct test_mixed_arr pkt = {0};
+	struct test_mixed_arr arr = {
+		.msg_type = "msg",
+		.dev_id = 123456,
+		.nested = {
+			.nested_int = 42,
+			.nested_bool = true,
+			.nested_string = "abc",
+			.nested_string_buf = "buf",
+			.nested_int8 = 1,
+			.nested_uint8 = 2,
+			.nested_int64 = 3,
+			.nested_uint64 = 4,
+		},
+		.arr = {10, 20, 30},
+		.arr_len = 3,
+		.status_buf = "ok",
+		.count = 5
+	};
+	int ret = json_mixed_arr_encode_buf(test_mixed_arr_descr,
+					    ARRAY_SIZE(test_mixed_arr_descr),
+					    &arr, buf, sizeof(buf));
+
+	zassert_equal(ret, 0, NULL);
+
+	ret = json_mixed_arr_parse(buf, strlen(buf),
+				   test_mixed_arr_descr,
+				   ARRAY_SIZE(test_mixed_arr_descr), &pkt);
+
+	zassert_equal(ret, 5, NULL);
+	zassert_str_equal(pkt.msg_type, "msg", NULL);
+	zassert_equal(pkt.dev_id, 123456, NULL);
+	zassert_equal(pkt.arr[0], 10, NULL);
+	zassert_str_equal(pkt.status_buf, "ok", NULL);
+}
+
+ZTEST(lib_json_test, test_json_mixed_arr_empty)
+{
+	struct test_mixed_arr arr = {0};
+	char json[] = "[]";
+	int ret = json_mixed_arr_parse(json, strlen(json),
+		test_mixed_arr_descr, 0, &arr);
+
+	zassert_equal(ret, 0, NULL);
+}
+
+ZTEST(lib_json_test, test_json_mixed_arr_calc_len)
+{
+	char buf[256];
+	ssize_t calc_len;
+	int ret;
+	struct test_mixed_arr arr = {
+		.msg_type = "msg",
+		.dev_id = 123456,
+		.nested = {
+			.nested_int = 42,
+			.nested_bool = true,
+			.nested_string = "abc",
+			.nested_string_buf = "buf",
+			.nested_int8 = 1,
+			.nested_uint8 = 2,
+			.nested_int64 = 3,
+			.nested_uint64 = 4,
+		},
+		.arr = {10, 20, 30},
+		.arr_len = 3,
+		.status_buf = "ok",
+		.count = 5
+	};
+
+	calc_len = json_calc_mixed_arr_len(test_mixed_arr_descr,
+					   ARRAY_SIZE(test_mixed_arr_descr),
+					   &arr);
+	ret = json_mixed_arr_encode_buf(test_mixed_arr_descr,
+					ARRAY_SIZE(test_mixed_arr_descr),
+					&arr, buf, sizeof(buf));
+	zassert_equal(ret, 0, NULL);
+
+	zassert_equal(calc_len, (ssize_t)strlen(buf), "Length mismatch");
+}
+
 ZTEST_SUITE(lib_json_test, NULL, NULL, NULL, NULL, NULL);