move models.py from root to test

models.py is used for test purposes.

models.py

-from flask import Flask
-from flask_sqlalchemy import SQLAlchemy
-
-app = Flask(__name__)
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///test.db'
-db = SQLAlchemy(app)
-
-
-element_label = db.Table('Element_Label', db.Model.metadata,
-                         db.Column('id_element', db.Integer, db.ForeignKey('element.id')),
-                         db.Column('id_label', db.Integer, db.ForeignKey('label.id'))
-                         )
-
-class Element(db.Model):
-    id = db.Column(db.INTEGER, primary_key=True)
-    element_name = db.Column(db.String(50), unique=True, nullable=False)
-    labels = db.relationship(
-        "Label",
-        secondary=element_label,
-        back_populates="elements")
-
-class Label(db.Model):
-    id = db.Column(db.INTEGER, primary_key=True)
-    label_name = db.Column(db.String(50), unique=True, nullable=False)
-    father_id = db.Column(db.INTEGER, db.ForeignKey('label.id'))
-    children = db.relationship("Label",
-                    backref=db.backref('parent', remote_side=[id])
-                    )
-    aliases = db.relationship('Alias', back_populates='label')
-    elements = db.relationship(
-        "Element",
-        secondary=element_label,
-        back_populates="labels")
-
-class Alias(db.Model):
-    alias_name = db.Column(db.String(100), primary_key=True)
-    id_label = db.Column(db.INTEGER, db.ForeignKey('label.id'), nullable=False)
-    label = db.relationship('Label', back_populates='aliases')
-
-
-
-