document_page_approval migration from Odoo 8.0 to Odoo 9.0

Lint error corrected

test improved

lint error corrected in test file

readme corrected

test improved

test of document page history workflow added

CI error corrected

dreipst comment

Migration to new api improved in model's file and data tag remove in xml file

code totally migrate to odoo 9.0 api

document_page_approval/tests/test_document_page_approval.py

@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+from openerp.tests import common
+
+
+class TestDocumentPageApproval(common.TransactionCase):
+    """Test document page approval model."""
+
+    def test_get_display_content(self):
+        """Test page display content."""
+        # Check content of a category
+        category = self.env['document.page'].search([
+            ('name', '=', 'OpenERP Features')
+            ])
+
+        self.assertIsNotNone(category.display_content, 'a category')
+
+        # Check content of a page
+        pages = self.env['document.page'].search([
+            ('parent_id', '=', category.id)
+            ])
+        page = pages[0]
+        self.assertIsNotNone(page.display_content, 'Page content')
+
+        # Check if approval is required
+        self.assertFalse(page.is_approval_required(page))
+
+        # Check content of an approval page
+        page.approval_required = True
+
+        self.assertIsNotNone(page.display_content, 'Page content')
+
+        # Check if approval is required
+        self.assertTrue(page.is_approval_required(page))
+
+        # Check if parent approval is required
+        self.assertTrue(page.is_parent_approval_required)