diff --git a/tests/test_crop.py b/tests/test_crop.py
new file mode 100644
index 0000000..4a53f56
--- /dev/null
+++ b/tests/test_crop.py
@@ -0,0 +1,40 @@
+import src as pyclip
+import os
+from .core.video import Video
+
+def crop(self, mock_video: pyclip.Video, left: int, upper: int, right: int, lower: int) -> Video:
+
+    # Check if the input video is opened
+    assert mock_video.isOpened(), f"Unable to open video file: {mock_video.file_path}"
+    
+    # Ensure that left, upper, right, and lower are integers
+    assert isinstance(left, int), "left must be an integer."
+    assert isinstance(upper, int), "upper must be an integer."
+    assert isinstance(right, int), "right must be an integer."
+    assert isinstance(lower, int), "lower must be an integer."
+
+    # get video details
+    frame_width = int(mock_video.getWidth())
+    frame_height = int(mock_video.getHeight())
+
+    # calculate the dimensions of the cropped region
+    new_width = right - left
+    new_height = lower - upper
+
+
+    # make assertions about the crop dimensions
+    assert new_width > 0, "Crop width must be greater than 0."
+    assert new_height > 0, "Crop height must be greater than 0."
+    assert left >= 0, "Left position must be non-negative."
+    assert upper >= 0, "Upper position must be non-negative."
+    assert right <= frame_width, "Right position must be within the video width."
+    assert lower <= frame_height, "Lower position must be within the video height."
+
+
+    output = mock_video.save(crop=[left, upper, right, lower])
+
+    return output
+
+
+
+