Добавленены тест для ошибкок

#50
#51

tests/templates/format/test_regex.py

@@ -247,3 +247,85 @@ Another line of endless sadness.
                                       parameters=parameters)
         original_object.join_template(template_object)
         assert original_object.document_text == join_result
+
+    def test_format_regex_empty_text_tag(self):
+        parameters = ParametersContainer({'multiline': True, 'dotall': True})
+        original_text = '''#-------------------------------------------------------------------------------
+# Modified by Calculate Utilities 4.0
+# Processed template files:
+# /path/to/ancient/template
+#-------------------------------------------------------------------------------
+Hello
+'''
+
+        template_text = r'''
+<reg>Hello</reg>
+<text></text>
+'''
+
+        join_result = '''#-------------------------------------------------------------------------------
+# Modified by Calculate Utilities 4.0
+# Processed template files:
+# /path/to/ancient/template
+# /path/to/template
+#-------------------------------------------------------------------------------
+
+'''
+
+        original_object = RegexFormat(original_text, '/path/to/template',
+                                      add_header=True, already_changed=True,
+                                      parameters=parameters)
+        template_object = RegexFormat(template_text, '/path/to/template',
+                                      parameters=parameters)
+        original_object.join_template(template_object)
+        assert original_object.document_text == join_result
+
+    def test_format_regex_does_not_strip_values_in_tags(self):
+        parameters = ParametersContainer({'multiline': True, 'dotall': True})
+        original_text = '''#-------------------------------------------------------------------------------
+# Modified by Calculate Utilities 4.0
+# Processed template files:
+# /path/to/ancient/template
+#-------------------------------------------------------------------------------
+Hello
+
+World
+
+
+World
+'''
+
+        template_text = r'''
+<reg>
+
+
+World</reg>
+<text>WWWW</text>
+<reg>\Z</reg>
+<text>
+
+Testing
+</text>
+'''
+
+        join_result = '''#-------------------------------------------------------------------------------
+# Modified by Calculate Utilities 4.0
+# Processed template files:
+# /path/to/ancient/template
+# /path/to/template
+#-------------------------------------------------------------------------------
+Hello
+
+WorldWWWW
+
+
+Testing
+'''
+
+        original_object = RegexFormat(original_text, '/path/to/template',
+                                      add_header=True, already_changed=True,
+                                      parameters=parameters)
+        template_object = RegexFormat(template_text, '/path/to/template',
+                                      parameters=parameters)
+        original_object.join_template(template_object)
+        assert original_object.document_text == join_result