TASK-001: Setup FastAPI project structure

tests/unit/__init__.py

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+"""Unit tests package."""

tests/unit/test_config.py

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+"""Unit tests for core configuration."""
+
+import pytest
+from app.core.config import Settings
+
+
+def test_settings_default_values():
+    """Test default settings values."""
+    settings = Settings()
+    assert settings.APP_NAME == "Instagram Clone"
+    assert settings.APP_VERSION == "0.1.0"
+    assert settings.DEBUG is False
+
+
+def test_settings_database_url_default():
+    """Test default database URL."""
+    settings = Settings()
+    assert "sqlite" in settings.DATABASE_URL

tests/unit/test_database.py

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+"""Unit tests for database module."""
+
+import pytest
+from app.db.database import Base, get_db
+
+
+def test_base_declarative():
+    """Test Base is a DeclarativeBase."""
+    from sqlalchemy.orm import DeclarativeBase
+    assert issubclass(Base, DeclarativeBase)
+
+
+def test_get_db_yields_session(db_session):
+    """Test get_db dependency yields database session."""
+    gen = get_db()
+    db = next(gen)
+    assert db is not None

tests/unit/test_main.py

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+"""Unit tests for main application endpoints."""
+
+import pytest
+
+
+def test_root_endpoint(client):
+    """Test root endpoint returns welcome message."""
+    response = client.get("/")
+    assert response.status_code == 200
+    data = response.json()
+    assert "message" in data
+    assert "version" in data
+
+
+def test_health_check_endpoint(client):
+    """Test health check endpoint."""
+    response = client.get("/health")
+    assert response.status_code == 200
+    assert response.json() == {"status": "healthy"}