Add test for RST replace

kivy/tests/test_rst_replace.py

@@ -0,0 +1,41 @@
+# coding=utf-8
+from kivy.tests.common import GraphicUnitTest
+from kivy.uix.rst import RstDocument
+
+
+class TestRstReplace(RstDocument):
+    def __init__(self, **kwargs):
+        super(TestRstReplace, self).__init__(**kwargs)
+        self.text = '''
+.. |uni| unicode:: 0xe4
+.. |nbsp| unicode:: 0xA0
+.. |text| replace:: is
+.. |hop| replace:: replaced
+.. _hop: https://kivy.org
+
+|uni| |nbsp| |text| |hop|_
+'''
+
+
+class RstSubstitutionTestCase(GraphicUnitTest):
+    def test_rst_replace(self):
+        rst = TestRstReplace()
+        self.render(rst)
+
+        # RstDocument > Scatter > GridLayout > RstParagraph
+        pg = rst.children[0].children[0].children[0]
+        rendered_text = pg.text[:]
+
+        # [anchor=] and [ref=] might change in the future
+        compare_text = (
+            u'[color=202020ff][anchor=hop]'
+            u'ä   is '
+            u'[ref=None][color=ce5c00ff]replaced[/color][/ref]'
+            u'[/color]'
+        )
+        self.assertEqual(rendered_text, compare_text)
+
+
+if __name__ == '__main__':
+    import unittest
+    unittest.main()