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"""Unit tests for ITranslationService interface contract."""
import pytest
from abc import ABC
from unittest.mock import Mock
from src.domain.interfaces.translation import ITranslationService
from src.domain.models.translation_request import TranslationRequest
from src.domain.models.text_content import TextContent
class TestITranslationService:
"""Test cases for ITranslationService interface contract."""
def test_interface_is_abstract(self):
"""Test that ITranslationService is an abstract base class."""
assert issubclass(ITranslationService, ABC)
# Should not be able to instantiate directly
with pytest.raises(TypeError):
ITranslationService() # type: ignore
def test_interface_has_required_method(self):
"""Test that interface defines the required abstract method."""
# Check that the method exists and is abstract
assert hasattr(ITranslationService, 'translate')
assert getattr(ITranslationService.translate, '__isabstractmethod__', False)
def test_method_signature(self):
"""Test that the method has the correct signature."""
import inspect
method = ITranslationService.translate
signature = inspect.signature(method)
# Check parameter names
params = list(signature.parameters.keys())
expected_params = ['self', 'request']
assert params == expected_params
# Check return annotation
assert signature.return_annotation == "'TextContent'"
def test_concrete_implementation_must_implement_method(self):
"""Test that concrete implementations must implement the abstract method."""
class IncompleteImplementation(ITranslationService):
pass
# Should not be able to instantiate without implementing abstract method
with pytest.raises(TypeError, match="Can't instantiate abstract class"):
IncompleteImplementation() # type: ignore
def test_concrete_implementation_with_method(self):
"""Test that concrete implementation with method can be instantiated."""
class ConcreteImplementation(ITranslationService):
def translate(self, request):
return TextContent(text="translated text", language=request.target_language)
# Should be able to instantiate
implementation = ConcreteImplementation()
assert isinstance(implementation, ITranslationService)
def test_method_contract_with_mock(self):
"""Test the method contract using a mock implementation."""
class MockImplementation(ITranslationService):
def __init__(self):
self.mock_method = Mock()
def translate(self, request):
return self.mock_method(request)
# Create test data
source_text = TextContent(text="Hello world", language="en")
request = TranslationRequest(
source_text=source_text,
target_language="es"
)
expected_result = TextContent(text="Hola mundo", language="es")
# Setup mock
implementation = MockImplementation()
implementation.mock_method.return_value = expected_result
# Call method
result = implementation.translate(request)
# Verify call and result
implementation.mock_method.assert_called_once_with(request)
assert result == expected_result
def test_interface_docstring_requirements(self):
"""Test that the interface method has proper documentation."""
method = ITranslationService.translate
assert method.__doc__ is not None
docstring = method.__doc__
# Check that docstring contains key information
assert "Translate text from source language to target language" in docstring
assert "Args:" in docstring
assert "Returns:" in docstring
assert "Raises:" in docstring
assert "TranslationFailedException" in docstring
def test_interface_type_hints(self):
"""Test that the interface uses proper type hints."""
method = ITranslationService.translate
annotations = getattr(method, '__annotations__', {})
assert 'request' in annotations
assert 'return' in annotations
# Check that type annotations are correct
assert annotations['request'] == "'TranslationRequest'"
assert annotations['return'] == "'TextContent'"
def test_multiple_implementations_possible(self):
"""Test that multiple implementations of the interface are possible."""
class NLLBImplementation(ITranslationService):
def translate(self, request):
return TextContent(text="NLLB translation", language=request.target_language)
class GoogleImplementation(ITranslationService):
def translate(self, request):
return TextContent(text="Google translation", language=request.target_language)
nllb = NLLBImplementation()
google = GoogleImplementation()
assert isinstance(nllb, ITranslationService)
assert isinstance(google, ITranslationService)
assert type(nllb) != type(google)
def test_interface_method_can_be_called_polymorphically(self):
"""Test that interface methods can be called polymorphically."""
class TestImplementation(ITranslationService):
def __init__(self, translation_prefix):
self.translation_prefix = translation_prefix
def translate(self, request):
translated_text = f"{self.translation_prefix}: {request.source_text.text}"
return TextContent(text=translated_text, language=request.target_language)
# Create different implementations
implementations = [
TestImplementation("Provider1"),
TestImplementation("Provider2")
]
# Test polymorphic usage
source_text = TextContent(text="Hello", language="en")
request = TranslationRequest(source_text=source_text, target_language="es")
results = []
for impl in implementations:
# Can call the same method on different implementations
result = impl.translate(request)
results.append(result.text)
assert results == ["Provider1: Hello", "Provider2: Hello"]
def test_interface_inheritance_chain(self):
"""Test the inheritance chain of the interface."""
# Check that it inherits from ABC
assert ABC in ITranslationService.__mro__
# Check that it's at the right position in MRO
mro = ITranslationService.__mro__
assert mro[0] == ITranslationService
assert ABC in mro
def test_method_parameter_validation_in_implementation(self):
"""Test that implementations can validate parameters."""
class ValidatingImplementation(ITranslationService):
def translate(self, request):
if not isinstance(request, TranslationRequest):
raise TypeError("request must be TranslationRequest")
# Validate that source and target languages are different
if request.effective_source_language == request.target_language:
raise ValueError("Source and target languages cannot be the same")
return TextContent(
text=f"Translated: {request.source_text.text}",
language=request.target_language
)
impl = ValidatingImplementation()
# Valid call should work
source_text = TextContent(text="Hello", language="en")
request = TranslationRequest(source_text=source_text, target_language="es")
result = impl.translate(request)
assert result.text == "Translated: Hello"
assert result.language == "es"
# Invalid parameter type should raise error
with pytest.raises(TypeError, match="request must be TranslationRequest"):
impl.translate("not a request") # type: ignore
# Same language should raise error
same_lang_text = TextContent(text="Hello", language="en")
same_lang_request = TranslationRequest(source_text=same_lang_text, target_language="en")
with pytest.raises(ValueError, match="Source and target languages cannot be the same"):
impl.translate(same_lang_request)
def test_implementation_can_handle_different_language_pairs(self):
"""Test that implementations can handle different language pairs."""
class MultiLanguageImplementation(ITranslationService):
def __init__(self):
self.translations = {
("en", "es"): {"Hello": "Hola", "world": "mundo"},
("en", "fr"): {"Hello": "Bonjour", "world": "monde"},
("es", "en"): {"Hola": "Hello", "mundo": "world"},
("fr", "en"): {"Bonjour": "Hello", "monde": "world"}
}
def translate(self, request):
source_lang = request.effective_source_language
target_lang = request.target_language
translation_dict = self.translations.get((source_lang, target_lang), {})
# Simple word-by-word translation for testing
words = request.source_text.text.split()
translated_words = [translation_dict.get(word, word) for word in words]
translated_text = " ".join(translated_words)
return TextContent(text=translated_text, language=target_lang)
impl = MultiLanguageImplementation()
# Test different language pairs
test_cases = [
("Hello world", "en", "es", "Hola mundo"),
("Hello world", "en", "fr", "Bonjour monde"),
("Hola mundo", "es", "en", "Hello world"),
("Bonjour monde", "fr", "en", "Hello world")
]
for text, source_lang, target_lang, expected in test_cases:
source_text = TextContent(text=text, language=source_lang)
request = TranslationRequest(
source_text=source_text,
target_language=target_lang,
source_language=source_lang
)
result = impl.translate(request)
assert result.text == expected
assert result.language == target_lang
def test_implementation_can_handle_auto_detect_source_language(self):
"""Test that implementations can handle auto-detection of source language."""
class AutoDetectImplementation(ITranslationService):
def translate(self, request):
# Use the effective source language (from TextContent if not explicitly set)
source_lang = request.effective_source_language
target_lang = request.target_language
# Simple mock translation based on detected language
if source_lang == "en" and target_lang == "es":
translated_text = f"ES: {request.source_text.text}"
elif source_lang == "es" and target_lang == "en":
translated_text = f"EN: {request.source_text.text}"
else:
translated_text = f"UNKNOWN: {request.source_text.text}"
return TextContent(text=translated_text, language=target_lang)
impl = AutoDetectImplementation()
# Test with explicit source language
source_text = TextContent(text="Hello", language="en")
explicit_request = TranslationRequest(
source_text=source_text,
target_language="es",
source_language="en"
)
result = impl.translate(explicit_request)
assert result.text == "ES: Hello"
assert result.language == "es"
# Test with auto-detected source language (None)
auto_request = TranslationRequest(
source_text=source_text, # language="en" in TextContent
target_language="es"
# source_language=None (default)
)
result = impl.translate(auto_request)
assert result.text == "ES: Hello" # Should use language from TextContent
assert result.language == "es"
assert auto_request.is_auto_detect_source is True |