1 files changed, 54 insertions, 0 deletions

diff --git a/tests/unit/test_cashu.c b/tests/unit/test_cashu.c
new file mode 100644
index 0000000..cec8e08
--- /dev/null
+++ b/tests/unit/test_cashu.c
@@ -0,0 +1,54 @@
+#include "test_framework.h"
+#include "../../main/cashu.h"
+#include "../../main/config.h"
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static tollgate_config_t g_test_config;
+
+const tollgate_config_t *tollgate_config_get(void) {
+    return &g_test_config;
+}
+
+int main(void)
+{
+    printf("=== test_cashu ===\n");
+
+    memset(&g_test_config, 0, sizeof(g_test_config));
+    strncpy(g_test_config.mint_url, "https://testnut.cashu.space", sizeof(g_test_config.mint_url) - 1);
+    g_test_config.price_per_step = 21;
+    g_test_config.step_size_ms = 60000;
+
+    printf("\n--- cashu_calculate_allotment_ms ---\n");
+    uint64_t a1 = cashu_calculate_allotment_ms(21, 21, 60000);
+    ASSERT_EQ_INT(60000, (int)a1, "21 sats at 21 sats/min = 60000ms");
+
+    uint64_t a2 = cashu_calculate_allotment_ms(42, 21, 60000);
+    ASSERT_EQ_INT(120000, (int)a2, "42 sats at 21 sats/min = 120000ms");
+
+    uint64_t a3 = cashu_calculate_allotment_ms(1, 21, 60000);
+    ASSERT_EQ_INT(0, (int)a3, "1 sat at 21 sats/min = 0ms (rounds down)");
+
+    uint64_t a4 = cashu_calculate_allotment_ms(100, 10, 30000);
+    ASSERT_EQ_INT(300000, (int)a4, "100 sats at 10 sats/30s = 300000ms");
+
+    printf("\n--- cashu_is_mint_accepted ---\n");
+    ASSERT(cashu_is_mint_accepted("https://testnut.cashu.space"), "testnut.cashu.space accepted");
+    ASSERT(!cashu_is_mint_accepted("https://evil.mint.example.com"), "evil mint rejected");
+    ASSERT(!cashu_is_mint_accepted(""), "empty string rejected");
+
+    printf("\n--- cashu_decode_token with garbage ---\n");
+    cashu_token_t token;
+    memset(&token, 0, sizeof(token));
+    esp_err_t ret = cashu_decode_token("garbage", &token);
+    ASSERT(ret != ESP_OK, "Garbage input returns error");
+
+    ret = cashu_decode_token("", &token);
+    ASSERT(ret != ESP_OK, "Empty string returns error");
+
+    ret = cashu_decode_token("cashuA!!invalid-base64!!", &token);
+    ASSERT(ret != ESP_OK, "Invalid base64url returns error");
+
+    TEST_SUMMARY();
+}