add reading password from file

Signed-off-by: Florian Brandes <florian.brandes@posteo.de>

tests/test_smtprd_ng.py

@@ -19,7 +19,6 @@
 Tests for smtprd_ng
 """
 # pylint: disable=protected-access
-# pylint: disable=unused-argument
 
 import configparser
 import email
@@ -68,6 +67,7 @@ def test_config_from_config():
     assert cfg.client.port == 465
     assert cfg.client.smime_cert == ""
     assert cfg.client.use_tls is True
+    assert cfg.client.password == ""
 
 
 def test_config_from_ini():
@@ -80,6 +80,24 @@ def test_config_from_ini():
     assert cfg.client.use_tls is True
 
 
+def test_read_from_file():
+    """Test read_from_file function and the fallback"""
+    existing_file = "config.example"
+    non_existing_file = "abcde"
+    empty_file = "tests/__init__.py"
+    empty_string = ""
+    assert smtprd.Config._read_from_file(existing_file) == "# [server]"
+    with pytest.raises(Exception) as e_info:
+        smtprd.Config._read_from_file(non_existing_file)
+    assert e_info.typename == "OSError"
+    assert str(e_info.value) == "File wasn't found: abcde"
+    assert smtprd.Config._read_from_file(empty_string) == ""
+    with pytest.raises(Exception) as e_info:
+        smtprd.Config._read_from_file(empty_file)
+    assert e_info.typename == "OSError"
+    assert str(e_info.value) == "Empty file supplied: tests/__init__.py"
+
+
 def test_config_emailcerts():
     """test retrieval of email/cert pair"""
     email_list = [("email1", "cert1"), ("email2", "cert2")]
@@ -153,7 +171,7 @@ def test_client_sign():
     assert "Test to sign" in v.decode()
 
 
-def test_cli_no_config_file(capsys):
+def test_cli_no_config_file():
     """Test whether config file parameter is supplied"""
     test_args = ["--config", ""]
     with pytest.raises(Exception) as e_info:
@@ -162,7 +180,7 @@ def test_cli_no_config_file(capsys):
     assert str(e_info.value) == "No config file supplied"
 
 
-def test_cli_config_file_not_found(capsys):
+def test_cli_config_file_not_found():
     """Test whether config file is found"""
     test_args = ["--config", "doesnotexist.conf"]
     with pytest.raises(Exception) as e_info: