feat: flip images / eq method for image

src/safeds/data/image/containers/_image.py

@@ -221,7 +221,7 @@ def resize(self, new_width: int, new_height: int) -> Image:
         new_image._image = new_image._image.resize((new_width, new_height))
         return new_image
 
-    def flip_image_vertically(self) -> Image:
+    def flip_vertically(self) -> Image:
         """
         Flip the image vertically (horizontal axis, flips up-down and vice versa).
 
@@ -234,7 +234,7 @@ def flip_image_vertically(self) -> Image:
         imagecopy._image = self._image.transpose(PIL.Image.FLIP_TOP_BOTTOM)
         return imagecopy
 
-    def flip_image_horizontally(self) -> Image:
+    def flip_horizontally(self) -> Image:
         """
         Flip the image horizontally (vertical axis, flips left-right and vice versa).
 

tests/safeds/data/image/containers/test_image.py

@@ -223,15 +223,27 @@ def test_should_raise(self) -> None:
         assert (image.__eq__(other)) is NotImplemented
 
 
-class TestFlip:
+class TestFlipVertically:
     def test_should_flip_vertically(self) -> None:
         image = Image.from_png_file(resolve_resource_path("image/original.png"))
-        image = image.flip_image_vertically()
+        image = image.flip_vertically()
         image2 = Image.from_png_file(resolve_resource_path("image/flip_vertically.png"))
         assert image == image2
 
+    def test_should_be_original(self) -> None:
+        image = Image.from_png_file(resolve_resource_path("image/original.png"))
+        image2 = image.flip_vertically().flip_vertically()
+        assert image == image2
+
+
+class TestFlipHorizontally:
     def test_should_flip_horizontally(self) -> None:
         image = Image.from_png_file(resolve_resource_path("image/original.png"))
-        image = image.flip_image_horizontally()
+        image = image.flip_horizontally()
         image2 = Image.from_png_file(resolve_resource_path("image/flip_horizontally.png"))
         assert image == image2
+
+    def test_should_should_be_original(self) -> None:
+        image = Image.from_png_file(resolve_resource_path("image/original.png"))
+        image2 = image.flip_horizontally().flip_horizontally()
+        assert image == image2