Span

tests/test_guitar_parts.py

@@ -25,7 +25,7 @@ class GuitarPartTests(unittest.TestCase):
     generator.model.validate_document(result)
     return result
   def test_profile_shapes_cover_defining_chord_tones(self):
-    for symbol in ('CM', 'Cm', 'C7', 'CmM7', 'Csus', 'Cdim7', 'Caug7', 'C7b9', 'C13', 'C5', 'CM/E'):
+    for symbol in ('CM', 'Cm', 'C7', 'CmM7', 'Csus', 'Cdim7', 'Caug7', 'C7b9', 'C13', 'CM/E'):
       for profile in ('acoustic', 'electric'):
         with self.subTest(symbol=symbol, profile=profile):
           definition = generator.harmony.parse_symbol(symbol)
@@ -43,6 +43,11 @@ class GuitarPartTests(unittest.TestCase):
     self.assertNotIn(0, generator.fretboard.chord_requirements(chord, respect_bass=False).required)
     candidates = generator.guitar.chord_positions(generator.fretboard.chord_requirements(chord, respect_bass=False), profile='electric')
     self.assertTrue(any(all(p.midi % 12 != 0 for p in c) for c in candidates))
+  def test_power_chord_cannot_expand_span_or_invent_upper_tones(self):
+    requirements = generator.fretboard.chord_requirements(generator.harmony.parse_symbol('C5'))
+    self.assertEqual(set(requirements.allowed), {0, 7})
+    self.assertFalse(generator.acoustic_voicing.candidates(requirements))
+    self.assertFalse(generator.guitar.chord_positions(requirements, profile='electric'))
   def test_acoustic_combines_independent_rhythms_with_a_fixed_grip(self):
     result = self.section(tests.test_parts.xml_harmony() + tests.test_musicxml.xml_note(), 'acoustic')
     measure = result['staves'][0]['measures'][0]