test: unit, integration and e2e tests

Task: MIL-002#6

tests/unit/application/test_use_cases.py

@@ -0,0 +1,68 @@
+import random
+
+import pytest
+from conftest import FakePasswordRepository
+
+from password_manager.application.use_cases import (
+    FindPasswordEntry,
+    GeneratePassword,
+    SavePasswordEntry,
+)
+from password_manager.domain.errors import (
+    DataFileNotFoundError,
+    EmptyFieldError,
+    EntryNotFoundError,
+)
+from password_manager.domain.password_entry import PasswordEntry
+
+
+def test_save_stores_entry(repository: FakePasswordRepository) -> None:
+    SavePasswordEntry(repository).execute("example.com", "me@x.org", "pw")
+
+    assert repository.entries["example.com"] == PasswordEntry(
+        "example.com", "me@x.org", "pw"
+    )
+
+
+@pytest.mark.parametrize(
+    ("website", "email", "password"),
+    [("", "e", "p"), ("w", "", "p"), ("w", "e", ""), ("  ", "e", "p")],
+)
+def test_save_rejects_empty_field(
+    repository: FakePasswordRepository, website: str, email: str, password: str
+) -> None:
+    with pytest.raises(EmptyFieldError):
+        SavePasswordEntry(repository).execute(website, email, password)
+    assert repository.entries == {}
+
+
+def test_find_returns_entry(repository: FakePasswordRepository) -> None:
+    SavePasswordEntry(repository).execute("example.com", "me@x.org", "pw")
+
+    entry = FindPasswordEntry(repository).execute("example.com")
+
+    assert entry.email == "me@x.org"
+
+
+def test_find_raises_when_website_unknown(
+    repository: FakePasswordRepository,
+) -> None:
+    with pytest.raises(EntryNotFoundError):
+        FindPasswordEntry(repository).execute("nope.com")
+
+
+def test_find_raises_when_no_data_file() -> None:
+    with pytest.raises(DataFileNotFoundError):
+        FindPasswordEntry(FakePasswordRepository(has_file=False)).execute("a.com")
+
+
+def test_find_rejects_empty_website(repository: FakePasswordRepository) -> None:
+    with pytest.raises(EmptyFieldError):
+        FindPasswordEntry(repository).execute("")
+
+
+def test_generate_uses_given_random_source() -> None:
+    first = GeneratePassword(random.Random(1)).execute()
+    second = GeneratePassword(random.Random(1)).execute()
+
+    assert first == second