fix: read the log file env var when checking for the off value

PQAnalysis/__init__.py

@@ -55,7 +55,7 @@
 
 log_file_env_var = os.getenv("PQANALYSIS_LOG_FILE")
 
-if log_file_env_var and logging_env_var.lower() != "off":
+if log_file_env_var and log_file_env_var.lower() != "off":
     config.use_log_file = True
 
     if log_file_env_var.lower() != "on" and len(log_file_env_var) > 0:

tests/test_logging_env_vars.py

@@ -0,0 +1,57 @@
+import os
+import subprocess
+import sys
+
+from pathlib import Path
+
+import PQAnalysis
+
+PACKAGE_ROOT = Path(PQAnalysis.__file__).resolve().parents[1]
+
+
+def run_import(log_file_value):
+    env = os.environ.copy()
+    env.pop("PQANALYSIS_LOGGING_LEVEL", None)
+    env["PQANALYSIS_LOG_FILE"] = log_file_value
+    env["PYTHONPATH"] = str(PACKAGE_ROOT)
+
+    return subprocess.run(
+        [
+            sys.executable,
+            "-c",
+            "import PQAnalysis.config as config; import PQAnalysis; "
+            "print(config.use_log_file, config.log_file_name)",
+        ],
+        cwd=PACKAGE_ROOT,
+        env=env,
+        capture_output=True,
+        text=True,
+        check=False,
+    )
+
+
+def test_log_file_env_var_without_logging_level():
+    result = run_import("on")
+
+    assert result.returncode == 0, result.stderr
+
+    use_log_file, log_file_name = result.stdout.split()
+    assert use_log_file == "True"
+    assert log_file_name.startswith("PQAnalysis_")
+
+
+def test_log_file_env_var_off():
+    result = run_import("off")
+
+    assert result.returncode == 0, result.stderr
+
+    use_log_file, log_file_name = result.stdout.split()
+    assert use_log_file == "False"
+    assert log_file_name != "off"
+
+
+def test_log_file_env_var_custom_name():
+    result = run_import("my_custom.log")
+
+    assert result.returncode == 0, result.stderr
+    assert result.stdout.split() == ["True", "my_custom.log"]