odoo workflow not working, following odoo 10 documentation - workflow

Question

i am following the odoo 10 workflow documentation tutorial and i was unable to get any response form clicking on the workflow buttons, no error is showing.
*please note that in my code the name of the module i am developing is "testModule" which is written as "test_module" inside python instead of "openacademy" that is used in the docs tutorial. and the view file is views.xml instead of openacademy.xml , could any of that have an impact?
views.xml
...
<!-- this is the sessions views -->
<!-- session form view -->
<record model="ir.ui.view" id="session_form_view">
<field name="name">session.form</field>
<field name="model">test_module.session</field>
<field name="arch" type="xml">
<form string="Session Form">
<header>
<button name="draft" type="workflow"
string="Reset to draft"
states="confirmed,done"/>
<button name="confirm" type="workflow"
string="Confirm" states="draft"
class="oe_highlight"/>
<button name="done" type="workflow"
string="Mark as done" states="confirmed"
class="oe_highlight"/>
<field name="state" widget="statusbar"/>
</header>
...
session_workflow.xml
<odoo>
<data>
<record model="workflow" id="wkf_session">
<field name="name">OpenAcademy sessions workflow</field>
<field name="osv">test_module.session</field>
<field name="on_create">True</field>
</record>
<record model="ir.actions.server" id="set_session_to_draft">
<field name="name">Set session to Draft</field>
<field name="model_id" ref="model_test_module_session"/>
<field name="code">
model.search([('id', 'in', context['active_ids'])]).action_draft()
</field>
</record>
<record model="workflow.activity" id="draft">
<field name="name">Draft</field>
<field name="wkf_id" ref="wkf_session"/>
<field name="flow_start" eval="True"/>
<field name="kind">dummy</field>
<field name="action"></field>
<field name="action_id" ref="set_session_to_draft"/>
</record>
<record model="ir.actions.server" id="set_session_to_confirmed">
<field name="name">Set session to Confirmed</field>
<field name="model_id" ref="model_test_module_session"/>
<field name="code">
model.search([('id', 'in', context['active_ids'])]).action_confirm()
</field>
</record>
<record model="workflow.activity" id="confirmed">
<field name="name">Confirmed</field>
<field name="wkf_id" ref="wkf_session"/>
<field name="kind">dummy</field>
<field name="action"></field>
<field name="action_id" ref="set_session_to_confirmed"/>
</record>
<record model="ir.actions.server" id="set_session_to_done">
<field name="name">Set session to Done</field>
<field name="model_id" ref="model_test_module_session"/>
<field name="code">
model.search([('id', 'in', context['active_ids'])]).action_done()
</field>
</record>
<record model="workflow.activity" id="done">
<field name="name">Done</field>
<field name="wkf_id" ref="wkf_session"/>
<field name="kind">dummy</field>
<field name="action"></field>
<field name="action_id" ref="set_session_to_done"/>
</record>
<record model="workflow.transition" id="session_draft_to_confirmed">
<field name="act_from" ref="draft"/>
<field name="act_to" ref="confirmed"/>
<field name="signal">confirm</field>
</record>
<record model="workflow.transition" id="session_confirmed_to_draft">
<field name="act_from" ref="confirmed"/>
<field name="act_to" ref="draft"/>
<field name="signal">draft</field>
</record>
<record model="workflow.transition" id="session_done_to_draft">
<field name="act_from" ref="done"/>
<field name="act_to" ref="draft"/>
<field name="signal">draft</field>
</record>
<record model="workflow.transition" id="session_confirmed_to_done">
<field name="act_from" ref="confirmed"/>
<field name="act_to" ref="done"/>
<field name="signal">done</field>
</record>
<record model="workflow.transition" id="session_auto_confirm_half_filled">
<field name="act_from" ref="draft"/>
<field name="act_to" ref="confirmed"/>
<field name="condition">taken_seats > 50</field>
</record>
</data>
inculded the call in manafest.py
'data': [
# 'security/ir.model.access.csv',
'views/views.xml',
'views/templates.xml',
'views/partner.xml',
'views/session_workflow.xml',
],
created the fields and functions in my sessions model in models.py
state = fields.Selection([
('draft', "Draft"),
('confirmed', "Confirmed"),
('done', "Done"),
])
#api.multi
def action_draft(self):
self.state = 'draft'
#api.multi
def action_confirm(self):
self.state = 'confirmed'
#api.multi
def action_done(self):
self.state = 'done'
and at the end i upgraded the module

Answer 1

This happens with Sessions you created before implementing the session_workflow.xml
It should work fine for sessions you create after implementing the session_workflow.xml. They placed a warning for it somewhere in the middle of the example.
Warning
A workflow associated with a model is only created when the model's
records are created. Thus there is no workflow instance associated
with session instances created before the workflow's definition