1 files changed, 125 insertions, 0 deletions

diff --git a/tests/unit/test_lnurl_pay.c b/tests/unit/test_lnurl_pay.c
new file mode 100644
index 0000000..d630b9c
--- /dev/null
+++ b/tests/unit/test_lnurl_pay.c
@@ -0,0 +1,125 @@
+#include "test_framework.h"
+#include <cjson/cJSON.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+static const char *SAMPLE_LNURLP_RESPONSE =
+    "{\"callback\":\"https://coinos.io/lnurlp/callback/abc123\","
+    "\"maxSendable\":1000000000,"
+    "\"minSendable\":1000,"
+    "\"metadata\":\"[[\\\"text/identifier\\\",\\\"TollGate@coinos.io\\\"]]\","
+    "\"tag\":\"payRequest\"}";
+
+static const char *SAMPLE_CALLBACK_RESPONSE =
+    "{\"pr\":\"lnbc1pvjluezpp5qqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqqqsyqcyq5rqwzqfqypqhp58yjmdan7s4g2e65tr58a50k2jdhz3l8eqc5x5z5f9e3u70fxnh00x09ml0q CONSTANTS\"}";
+
+static const char *SAMPLE_MISSING_AT = "no-at-sign.com";
+static const char *SAMPLE_MISSING_CALLBACK = "{\"tag\":\"payRequest\"}";
+static const char *SAMPLE_MISSING_PR = "{\"status\":\"ERROR\"}";
+
+static bool test_parse_lnurlp_response(void)
+{
+    cJSON *root = cJSON_Parse(SAMPLE_LNURLP_RESPONSE);
+    if (!root) return false;
+
+    cJSON *callback = cJSON_GetObjectItemCaseSensitive(root, "callback");
+    bool ok = (callback && cJSON_IsString(callback) &&
+               strcmp(callback->valuestring, "https://coinos.io/lnurlp/callback/abc123") == 0);
+
+    cJSON *min_sendable = cJSON_GetObjectItemCaseSensitive(root, "minSendable");
+    ok = ok && (min_sendable && cJSON_IsNumber(min_sendable) && min_sendable->valuedouble == 1000);
+
+    cJSON *max_sendable = cJSON_GetObjectItemCaseSensitive(root, "maxSendable");
+    ok = ok && (max_sendable && cJSON_IsNumber(max_sendable));
+
+    cJSON_Delete(root);
+    return ok;
+}
+
+static bool test_parse_callback_response(void)
+{
+    cJSON *root = cJSON_Parse(SAMPLE_CALLBACK_RESPONSE);
+    if (!root) return false;
+
+    cJSON *pr = cJSON_GetObjectItemCaseSensitive(root, "pr");
+    bool ok = (pr && cJSON_IsString(pr) && strncmp(pr->valuestring, "lnbc", 4) == 0);
+
+    cJSON_Delete(root);
+    return ok;
+}
+
+static bool test_lightning_address_parse(void)
+{
+    const char *addr = "TollGate@coinos.io";
+    const char *at = strchr(addr, '@');
+    if (!at) return false;
+
+    size_t user_len = at - addr;
+    if (user_len != 8) return false;
+
+    char username[64];
+    memcpy(username, addr, user_len);
+    username[user_len] = '\0';
+
+    if (strcmp(username, "TollGate") != 0) return false;
+    if (strcmp(at + 1, "coinos.io") != 0) return false;
+
+    return true;
+}
+
+static bool test_amount_validation(void)
+{
+    uint64_t min_msat = 1000;
+    uint64_t max_msat = 1000000000;
+    uint64_t amount_msat = 21 * 1000;
+
+    bool ok = (amount_msat >= min_msat && amount_msat <= max_msat);
+    ok = ok && !(0 >= min_msat);
+    ok = ok && !(2000000000ULL <= max_msat);
+    return ok;
+}
+
+int main(void)
+{
+    printf("=== test_lnurl_pay ===\n");
+
+    printf("\n--- LNURL-pay response parsing ---\n");
+    ASSERT(test_parse_lnurlp_response(), "parse lnurlp response: callback + min/max");
+
+    printf("\n--- Callback response parsing ---\n");
+    ASSERT(test_parse_callback_response(), "parse callback response: extract bolt11 'pr'");
+
+    printf("\n--- Lightning address parsing ---\n");
+    ASSERT(test_lightning_address_parse(), "split 'TollGate@coinos.io' into user + domain");
+
+    printf("\n--- Amount validation ---\n");
+    ASSERT(test_amount_validation(), "21 sats (21000 msat) within [1000, 1000000000]");
+
+    printf("\n--- Missing @ in address ---\n");
+    {
+        const char *addr = "no-at-sign.com";
+        const char *at = strchr(addr, '@');
+        ASSERT(at == NULL, "no @ returns NULL");
+    }
+
+    printf("\n--- Missing callback in response ---\n");
+    {
+        cJSON *root = cJSON_Parse(SAMPLE_MISSING_CALLBACK);
+        cJSON *cb = cJSON_GetObjectItemCaseSensitive(root, "callback");
+        ASSERT(!cb, "missing callback detected");
+        cJSON_Delete(root);
+    }
+
+    printf("\n--- Missing pr in callback response ---\n");
+    {
+        cJSON *root = cJSON_Parse(SAMPLE_MISSING_PR);
+        cJSON *pr = cJSON_GetObjectItemCaseSensitive(root, "pr");
+        ASSERT(!pr, "missing pr detected");
+        cJSON_Delete(root);
+    }
+
+    TEST_SUMMARY();
+}