Add tests

sale_project_fixed_price_task_completed_invoicing/data/sale_project_fixed_price_demo.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <data noupdate="1">
+        <record id="product.service_order_01" model="product.product">
+            <field name="track_service">timesheet</field>
+        </record>
+        <record id="product.product_product_2" model="product.product">
+            <field name="name">Support Contract (on timesheet)</field>
+            <field name="track_service">timesheet</field>
+        </record>
+
+        <record id="line_services" model="sale.order.line">
+            <field name="order_id" ref="sale.sale_order_3"/>
+            <field name="name">Advance</field>
+            <field name="product_id" ref="sale.advance_product_0"/>
+            <field name="product_uom" ref="product.product_uom_day"/>
+            <field name="price_unit">150.0</field>
+            <field name="product_uom_qty">5.0</field>
+        </record>
+
+        <record id="project_GAP" model="project.project">
+            <field name="date_start" eval="time.strftime('%Y-%m-01 10:00:00')"/>
+            <field name="name">Internal - GAP Analysis</field>
+            <field name="color">2</field>
+            <field name="privacy_visibility">employees</field>
+            <field name="alias_model">project.task</field>
+            <field name="type_ids" eval="[(4, ref('project.project_stage_0')) ,(4,ref('project.project_stage_1')) ,(4,ref('project.project_stage_2')) ,(4,ref('project.project_stage_3'))]"/>
+        </record>
+
+        <record id="product.product_product_fixed_price" model="product.product">
+            <field name="track_service">task</field>
+            <field name="project_id" ref="project_GAP"/>
+        </record>
+    </data>
+</odoo>

sale_project_fixed_price_task_completed_invoicing/tests/__init__.py

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+# -*- coding: utf-8 -*-
+from . sale_project_fixed_price

sale_project_fixed_price_task_completed_invoicing/tests/sale_project_fixed_price.py

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+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+from odoo.addons.sale.tests.test_sale_common import TestSale
+
+
+class TestSaleProjectFixedPrice(TestSale):
+
+    def test_sale_project_fixed_price(self):
+        prod_task = self.env.ref('product.product_product_fixed_price')
+        so_vals = {
+            'partner_id': self.partner.id,
+            'partner_invoice_id': self.partner.id,
+            'partner_shipping_id': self.partner.id,
+            'order_line': [(0, 0, {'name': prod_task.name,
+                                   'product_id': prod_task.id,
+                                   'product_uom_qty': 1,
+                                   'product_uom': prod_task.uom_id.id,
+                                   'price_unit': prod_task.list_price})],
+            'pricelist_id': self.env.ref('product.list0').id,
+        }
+        so = self.env['sale.order'].create(so_vals)
+        so.action_confirm()
+
+        # check task creation
+        project = self.env.ref('sale_timesheet.project_GAP')
+        task = project.task_ids.filtered(
+            lambda t: t.name == '%s:%s' % (so.name, prod_task.name))
+        self.assertTrue(task, 'Sale Service: task is not created')
+        self.assertEqual(task.partner_id, so.partner_id,
+                         'Sale Service: customer should be the same on task '
+                         'and on SO')
+        # validate the task
+        task.toggle_invoiceable()
+        line = so.order_line
+        self.assertTrue(line.product_uom_qty == line.qty_delivered,
+                        'Sale Service: line should be invoiced completely')