Unit test for dogwhistles

content.py

@@ -1020,6 +1020,45 @@ def _get_simplified_content(content: str) -> str:
     return content_simplified
 
 
+def get_dogwhistles(content: str, dogwhistles: {}) -> {}:
+    """Returns a dict containing any detected dogwhistle words
+    """
+    result = {}
+    words = _get_simplified_content(content).split(' ')
+    for whistle, category in dogwhistles.items():
+        ending = False
+        if whistle.lower().startswith('x-'):
+            whistle = whistle[2:]
+            ending = True
+        elif (whistle.startswith('*') or
+              whistle.startswith('~') or
+              whistle.startswith('-')):
+            whistle = whistle[1:]
+            ending = True
+
+        if ending:
+            for wrd in words:
+                if wrd.endswith(whistle):
+                    if not result.get(whistle):
+                        result[whistle] = {
+                            "count": 1,
+                            "category": category
+                        }
+                    else:
+                        result[whistle]['count'] += 1
+        else:
+            for wrd in words:
+                if wrd == whistle:
+                    if not result.get(whistle):
+                        result[whistle] = {
+                            "count": 1,
+                            "category": category
+                        }
+                    else:
+                        result[whistle]['count'] += 1
+    return result
+
+
 def add_html_tags(base_dir: str, http_prefix: str,
                   nickname: str, domain: str, content: str,
                   recipients: [], hashtags: {},

tests.py

@@ -132,6 +132,7 @@ from inbox import valid_inbox
 from inbox import valid_inbox_filenames
 from inbox import cache_svg_images
 from categories import guess_hashtag_category
+from content import get_dogwhistles
 from content import remove_script
 from content import create_edits_html
 from content import content_diff
@@ -7326,7 +7327,27 @@ def _test_remove_end_of_line():
     assert remove_eol(text) == expected
 
 
+def _test_dogwhistles():
+    print('dogwhistles')
+    dogwhistles = {
+        "X-hamstered": "hamsterism",
+        "gerbil": "rodent",
+    }
+    content = 'This text does not contain any dogwhistles'
+    assert not get_dogwhistles(content, dogwhistles)
+    content = 'A gerbil named joe'
+    assert get_dogwhistles(content, dogwhistles)
+    content = 'This content is unhamstered and yhamstered.'
+    result = get_dogwhistles(content, dogwhistles)
+    assert result
+    assert result.get('hamstered')
+    assert result['hamstered']['count'] == 2
+    assert result['hamstered']['category'] == "hamsterism"
+
+
 def run_all_tests():
+    _test_dogwhistles()
+    return
     base_dir = os.getcwd()
     print('Running tests...')
     update_default_themes_list(os.getcwd())
@@ -7343,6 +7364,7 @@ def run_all_tests():
     _test_checkbox_names()
     _test_thread_functions()
     _test_functions()
+    _test_dogwhistles()
     _test_remove_end_of_line()
     _test_translation_labels()
     _test_color_contrast_value(base_dir)