Add model Libros y serializadores

tests/libros/test_create_model.py

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+# tests/libros/test_create_model.py
+
+import pytest
+
+from app.libros.models import Libros
+
+@pytest.mark.django_db
+def test_libros_model():
+
+    ## Given
+    # Creamos un nuevo libro en la base de datos
+    libro = Libros(
+        title="La fundación",
+        genre="Ciencia ficción",
+        year="1951",
+        author="Isaac Asimov",
+    )
+    libro.save()
+
+    ## When
+
+    ## Then
+    assert libro.title == "La fundación"
+    assert libro.genre == "Ciencia ficción"
+    assert libro.year == "1951"
+    assert libro.author == "Isaac Asimov"
+    assert libro.created_at
+    assert libro.updated_at
+    assert str(libro) == libro.title

tests/libros/test_serializers.py

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+# tests/libros/test_serializers.py
+
+from app.libros.serializers import LibroSerializer
+
+def test_valid_libro_serializer():
+    valid_serializer_data = {
+        "title": "Raising Arizona",
+        "genre": "comedy",
+        "year": "1987",
+        "author": "Ray Bradbury",
+    }
+    serializer = LibroSerializer(data=valid_serializer_data)
+    assert serializer.is_valid()
+    assert serializer.validated_data == valid_serializer_data
+    assert serializer.data == valid_serializer_data
+    assert serializer.errors == {}
+
+
+def test_invalid_libro_serializer():
+    invalid_serializer_data = {
+        "title": "Soy Leyenda",
+        "author": "Richard Matheson",
+    }
+    serializer = LibroSerializer(data=invalid_serializer_data)
+    assert not serializer.is_valid()
+    assert serializer.validated_data == {}
+    assert serializer.data == invalid_serializer_data
+    assert serializer.errors == {
+        "year": ["This field is required."],
+        "genre": ["This field is required."],
+    }