test(cli): ✅ add tests for from_mails command

close task #85

tests/test_cli.py

@@ -2,7 +2,10 @@ import re
 from pathlib import Path
 
 import pytest
+from exchangelib import Message
 from typer.testing import CliRunner
+from unittest.mock import MagicMock
+
 
 from logwatcher import __version__
 from logwatcher.cli import _get_files_from_dir, _is_log_file, app
@@ -397,4 +400,84 @@ def test_cli_from_files_valid_logs(output_path: Path, valid_log_dir: Path):
         content = file.read_text(encoding="windows-1252")
         assert re.search(f"Période\t : {date_pattern} -> {date_pattern}\n", content)
         assert f"Fichier(s) lu(s)\t : {nb_files}" in content
-        assert "Nombre total d'erreur(s)\t: 0" not in content
+        assert "Nombre total d'erreur(s)\t: 0" not in content
+
+
+def test_cli_from_mails_no_output_dir(monkeypatch, make_mock_account):
+    """Assert everything works when no output_path is provided.
+    
+    Must use "output/" directory, located in project root.
+
+
+
+    """
+    messages = [
+        Message(subject="subject test 1", text_body="body test 1"),
+        Message(subject="subject test 2", text_body="body test 2"),
+        Message(subject="subject test 3", text_body="body test 3")
+    ]
+
+    with monkeypatch.context() as m:
+        m.setattr("logwatcher.cli.connect_to_mailbox", lambda: make_mock_account(messages=messages, analyzed_folder="Analyzed"))
+        m.setattr("logwatcher.notifier.Message.send", MagicMock(return_value=None))
+        
+        arguments = ["from-mails"]
+        results = runner.invoke(app, arguments)
+        assert results.exit_code == 0
+
+
+def test_cli_from_mails_invalid_output_dir(tmp_path, monkeypatch):
+    """Assert that if output_dir is a file, raise an error.
+    
+    Args:
+        tmp_path: path where to store temporarily output files
+        monkeypatch: used to fake a context and method calls
+        make_mock_account: initialize a fake account object
+
+    """
+    bad_output_dir = tmp_path.touch("test_file.txt")
+
+    messages = [
+        Message(subject="subject test 1", text_body="body test 1"),
+    ]
+
+    with monkeypatch.context() as m:
+        m.setattr("logwatcher.cli.connect_to_mailbox", lambda: make_mock_account(messages=messages, analyzed_folder="Analyzed"))
+        m.setattr("logwatcher.notifier.Message.send", MagicMock(return_value=None))
+        
+        arguments = ["from-mails", "--output-dir", bad_output_dir]
+        results = runner.invoke(app, arguments)
+        assert results.exit_code != 0
+
+
+def test_cli_from_mails_valid_output_dir(tmp_path, monkeypatch, make_mock_account):
+    """Assert everything works when a valid output_path is provided.
+    
+    Args:
+        tmp_path: path where to store temporarily output files
+        monkeypatch: used to fake a context and method calls
+        make_mock_account: initialize a fake account object
+
+    """
+    output_path = tmp_path / "output_test"
+
+    messages = [
+        Message(subject="subject test 1", text_body="body test 1"),
+        Message(subject="subject test 2", text_body="body test 2"),
+        Message(subject="subject test 3", text_body="body test 3")
+    ]
+
+    with monkeypatch.context() as m:
+        m.setattr("logwatcher.cli.connect_to_mailbox", lambda: make_mock_account(messages=messages, analyzed_folder="Analyzed"))
+        m.setattr("logwatcher.notifier.Message.send", MagicMock(return_value=None))
+        
+        arguments = ["from-mails", "--output-dir", output_path]
+        results = runner.invoke(app, arguments)
+    
+    assert results.exit_code == 0
+    output_children = list(output_path.iterdir())
+    expected = ["n2.log", "all.log", "other.log"]
+    file_names = [file.name for file in output_children]
+    assert len(output_children) == len(expected)
+    for name in expected:
+        assert name in file_names