[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/conftest.py

@@ -1,4 +1,5 @@
 import multiprocessing
+import os
 import shutil
 import time
 from pathlib import Path
@@ -8,9 +9,13 @@ import pytest_asyncio
 import uvicorn
 from uvicorn import Config, Server
 
+from cashu.core.db import Database
 from cashu.core.migrations import migrate_databases
 from cashu.core.settings import settings
-from cashu.wallet import migrations
+from cashu.lightning.fake import FakeWallet
+from cashu.mint import migrations as migrations_mint
+from cashu.mint.ledger import Ledger
+from cashu.wallet import migrations as migrations_wallet
 from cashu.wallet.wallet import Wallet
 
 SERVER_ENDPOINT = "http://localhost:3337"
@@ -61,3 +66,23 @@ def mint():
     time.sleep(1)
     yield server
     server.stop()
+
+
+@pytest_asyncio.fixture(scope="function")
+async def ledger():
+    async def start_mint_init(ledger):
+        await migrate_databases(ledger.db, migrations_mint)
+        await ledger.load_used_proofs()
+        await ledger.init_keysets()
+
+    db_file = "data/mint/test.sqlite3"
+    if os.path.exists(db_file):
+        os.remove(db_file)
+    ledger = Ledger(
+        db=Database("test", "data/mint"),
+        seed="TEST_PRIVATE_KEY",
+        derivation_path="0/0/0/0",
+        lightning=FakeWallet(),
+    )
+    await start_mint_init(ledger)
+    yield ledger