Bug 1580620 - [mozbase] Make manifestparser fail on duplicate keys even without strict mode r=gbrown

Differential Revision: https://phabricator.services.mozilla.com/D45592

--HG--
extra : moz-landing-system : lando

testing/mozbase/manifestparser/manifestparser/ini.py

@@ -123,11 +123,13 @@ def read_ini(fp, variables=None, default='DEFAULT', defaults_only=False,
                 value = value.strip()
                 key_indent = line_indent
 
+                # make sure this key isn't already in the section
+                if key and current_section is not variables:
+                    assert key not in current_section
+
                 if strict:
-                    # make sure this key isn't already in the section or empty
+                    # make sure this key isn't empty
                     assert key
-                    if current_section is not variables:
-                        assert key not in current_section
 
                 current_section[key] = value
                 break

testing/mozbase/manifestparser/tests/test_read_ini.py

@@ -21,11 +21,11 @@ import mozunit
 
 class IniParserTest(unittest.TestCase):
 
-    def parse_manifest(self, string):
+    def parse_manifest(self, string, **kwargs):
         buf = StringIO()
         buf.write(string)
         buf.seek(0)
-        return read_ini(buf)
+        return read_ini(buf, **kwargs)
 
     def test_inline_comments(self):
         result = self.parse_manifest("""
@@ -59,6 +59,18 @@ birds=nope
         self.assertEqual(result[1][1]['dogs'].split(), ['yep', 'yep'])
         self.assertEqual(result[1][1]['birds'].split(), ['nope', 'fish=nope'])
 
+    def test_dupes_error(self):
+        dupes = """
+[test_dupes.py]
+foo = bar
+foo = baz
+"""
+        with self.assertRaises(AssertionError):
+            self.parse_manifest(dupes, strict=True)
+
+        with self.assertRaises(AssertionError):
+            self.parse_manifest(dupes, strict=False)
+
 
 if __name__ == '__main__':
     mozunit.main()