refactor: move to own files

app/main.py

@@ -1,20 +1,6 @@
-import random
-import string
-
 import typer
 
-
-def generate_password(seed: int) -> str:
-    lowercase = string.ascii_lowercase
-    uppercase = string.ascii_uppercase
-    digits = string.digits
-
-    letters = lowercase + uppercase + digits
-
-    random_generator = random.Random(seed)
-
-    return "".join(random_generator.sample(letters, 8))
-
+from .pass_gen import generate_password
 
 app = typer.Typer()
 

app/main_test.py

@@ -1,14 +1,10 @@
-import pytest
+from typer.testing import CliRunner
+from .main import app
 
-from app.main import generate_password
+runner = CliRunner()
 
 
-@pytest.mark.parametrize(
-    ("seed", "expected"),
-    [
-        (0, "2yW4AcqG"),
-        (1, "iK2ZWeqh"),
-    ],
-)
-def test_can_generate_random_password(seed: int, expected: str) -> None:
-    assert generate_password(seed) == expected
+def test_cli_print_password() -> None:
+    result = runner.invoke(app)
+    assert result.exit_code == 0
+    assert "2yW4AcqG" in result.stdout

app/pass_gen.py

@@ -0,0 +1,14 @@
+import string
+import random
+
+
+def generate_password(seed: int) -> str:
+    lowercase = string.ascii_lowercase
+    uppercase = string.ascii_uppercase
+    digits = string.digits
+
+    letters = lowercase + uppercase + digits
+
+    random_generator = random.Random(seed)
+
+    return "".join(random_generator.sample(letters, 8))

app/pass_gen_test.py

@@ -0,0 +1,13 @@
+import pytest
+from .pass_gen import generate_password
+
+
+@pytest.mark.parametrize(
+    ("seed", "expected"),
+    [
+        (0, "2yW4AcqG"),
+        (1, "iK2ZWeqh"),
+    ],
+)
+def test_can_generate_random_password(seed: int, expected: str) -> None:
+    assert generate_password(seed) == expected