first commit

tests/test_config.py

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+from gpu_rent.config import load_config
+from gpu_rent.ssh_keys import ensure_ed25519, public_path
+
+
+def test_load_config_missing_auth(monkeypatch, tmp_path):
+    monkeypatch.setenv("HOME", str(tmp_path))
+    monkeypatch.setenv("USERPROFILE", str(tmp_path))
+    for key in (
+        "OS_AUTH_URL",
+        "OS_USER_DOMAIN_NAME",
+        "OS_USERNAME",
+        "OS_PASSWORD",
+        "OS_PROJECT_ID",
+        "OS_REGION_NAME",
+        "GPU_RENT_AZ",
+    ):
+        monkeypatch.delenv(key, raising=False)
+    cfg = load_config(require_auth=False)
+    assert not cfg.auth_ok
+    assert "OS_USERNAME" in cfg.missing
+    assert cfg.data_volume_size_gb == 100
+
+
+def test_ssh_key_generate(tmp_path):
+    private = tmp_path / "id_ed25519"
+    got, pub = ensure_ed25519(private)
+    assert got == private
+    assert pub == public_path(private)
+    assert private.is_file()
+    assert pub.is_file()
+    text = pub.read_text(encoding="utf-8")
+    assert text.startswith("ssh-ed25519")
+    ensure_ed25519(private)
+    assert private.read_bytes()