test: add load and clean txt file test

test/test_load_txt.py

@@ -0,0 +1,24 @@
+from GramAddict.core.interaction import _load_and_clean_txt_file
+
+
+def test_load_txt_ok(mocker):
+    mocker.patch("os.path.join", return_value="txt/txt_ok.txt")
+    message = _load_and_clean_txt_file("test_user", "txt_filename")
+    assert message is not None
+    assert message == [
+        "Hello, test_user! How are you today?",
+        "Hello everyone!",
+        "Goodbye, test_user! Have a great day!",
+    ]
+
+
+def test_load_txt_empty(mocker):
+    mocker.patch("os.path.join", return_value="txt/txt_empty.txt")
+    message = _load_and_clean_txt_file("test_user", "txt_filename")
+    assert message is None
+
+
+def test_load_txt_not_exists(mocker):
+    mocker.patch("os.path.join", return_value="txt/txt_not_exists.txt")
+    message = _load_and_clean_txt_file("test_user", "txt_filename")
+    assert message is None

test/txt/txt_empty.txt

@@ -0,0 +1,5 @@
+
+
+
+
+

test/txt/txt_ok.txt

@@ -0,0 +1,6 @@
+
+Hello, test_user! How are you today?
+Hello everyone!
+
+Goodbye, test_user! Have a great day!
+