[Mint] add mint api tests (#189)

* add mint api tests

* add /info test and fix NUT-09 contact info strings

* add test mint api

* replace with requests

tests/test_mint_api.py

@@ -0,0 +1,44 @@
+import asyncio
+
+import pytest
+import pytest_asyncio
+import requests
+
+from cashu.core.settings import settings
+from tests.conftest import ledger
+
+BASE_URL = f"http://localhost:3337"
+
+
+@pytest.mark.asyncio
+async def test_info(ledger):
+    response = requests.get(f"{BASE_URL}/info")
+    assert response.status_code == 200, f"{response.url} {response.status_code}"
+    assert response.json()["pubkey"] == ledger.pubkey.serialize().hex()
+
+
+@pytest.mark.asyncio
+async def test_api_keys(ledger):
+    response = requests.get(f"{BASE_URL}/keys")
+    assert response.status_code == 200, f"{response.url} {response.status_code}"
+    assert response.json() == {
+        str(k): v.serialize().hex() for k, v in ledger.keyset.public_keys.items()
+    }
+
+
+@pytest.mark.asyncio
+async def test_api_keysets(ledger):
+    response = requests.get(f"{BASE_URL}/keysets")
+    assert response.status_code == 200, f"{response.url} {response.status_code}"
+    assert response.json()["keysets"] == list(ledger.keysets.keysets.keys())
+
+
+@pytest.mark.asyncio
+async def test_api_keyset_keys(ledger):
+    response = requests.get(
+        f"{BASE_URL}/keys/{'1cCNIAZ2X/w1'.replace('/', '_').replace('+', '-')}"
+    )
+    assert response.status_code == 200, f"{response.url} {response.status_code}"
+    assert response.json() == {
+        str(k): v.serialize().hex() for k, v in ledger.keyset.public_keys.items()
+    }