def test_equal_1(self): self.assertEqual(heavy_metal_umlauts( 'Announcing the Macbook Air Guitar' ), 'Ännöüncïng thë Mäcböök Äïr Güïtär')
def test_equal_3(self): self.assertEqual(heavy_metal_umlauts( "Strong sales of Google's VR Metalheadsets send tech stock pric" "es soaring" ), "Ströng sälës öf Gööglë's VR Mëtälhëädsëts sënd tëch stöck prïcë" "s söärïng")
def test_equal_4(self): self.assertEqual(heavy_metal_umlauts( 'Vegan Black Metal Chef hits the big time on Amazon TV' ), 'Vëgän Bläck Mëtäl Chëf hïts thë bïg tïmë ön Ämäzön TV')
def test_equal_2(self): self.assertEqual(heavy_metal_umlauts( 'Facebook introduces new heavy metal reaction buttons' ), 'Fäcëböök ïntrödücës nëw hëävÿ mëtäl rëäctïön büttöns')