improved users_controller_test suit

[carlosdanielpohlod]

Description

The user model don´t have a valid email validation and the users_controller d

Related Issue

Test coverage issue: #862
My opened issue: #1595

Motivation and Context

Email invalid formats has been acepted without then, and this changes provides more tests

How Has This Been Tested?

I made a test suit with valid and invalid inputs

Types of changes

• [x ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x ] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• [ x] I have read the CONTRIBUTING document.
• [ x] I have added tests to cover my changes.
• [ x] All new and existing tests passed.