[test] #197: add test for auth_method()

* add patched auth functions

tests/patched/auth.py

+# This file contains patches for auth functions.
+
+
+def patched_auth_by_seed():
+    return "call_auth_by_seed"
+
+
+def patched_auth_by_wif():
+    return "call_auth_by_wif"
+
+
+def patched_auth_by_auth_file():
+    return "call_auth_by_auth_file"
+
+
+def patched_auth_by_scrypt():
+    return "call_auth_by_scrypt"

tests/test_auth.py

+import pytest
+import click
+
+from silkaj import auth
+
+from patched.auth import (
+    patched_auth_by_seed,
+    patched_auth_by_wif,
+    patched_auth_by_auth_file,
+    patched_auth_by_scrypt,
+)
+
+# test auth_method
+@pytest.mark.parametrize(
+    "seed, file, wif, auth_method_called",
+    [
+        (True, False, False, "call_auth_by_seed"),
+        (False, True, False, "call_auth_by_auth_file"),
+        (False, False, True, "call_auth_by_wif"),
+        (False, False, False, "call_auth_by_scrypt"),
+    ],
+)
+def test_auth_method(seed, file, wif, auth_method_called, monkeypatch):
+    monkeypatch.setattr("silkaj.auth.auth_by_seed", patched_auth_by_seed)
+    monkeypatch.setattr("silkaj.auth.auth_by_wif", patched_auth_by_wif)
+    monkeypatch.setattr("silkaj.auth.auth_by_auth_file", patched_auth_by_auth_file)
+    monkeypatch.setattr("silkaj.auth.auth_by_scrypt", patched_auth_by_scrypt)
+    ctx = click.Context(
+        click.Command(""), obj={"AUTH_SEED": seed, "AUTH_FILE": file, "AUTH_WIF": wif}
+    )
+    with ctx:
+        assert auth_method_called == auth.auth_method()