diff --git a/test/unit_tests/coordinate_transformer_test.py b/test/unit_tests/coordinate_transformer_test.py
index 4be5be1..549ac4a 100644
--- a/test/unit_tests/coordinate_transformer_test.py
+++ b/test/unit_tests/coordinate_transformer_test.py
@@ -23,7 +23,21 @@ def coordinate_test_fpdf():
     return pdf
 
 
+@pytest.fixture(params=["top_left", "bottom_left", "bottom_right", "top_right"])
+def corner(request):
+    return request.param
+
+
 def get_fpdf_coordinates(corner):
+    """Origin top left, y1 <= y2; all coords on page are positive
+    (0,0)--+--(2,0)--+
+      |////|    |////|
+      +--(1,1)  +--(3,1)
+
+    (0,2)--+  (2,2)--+
+      |////|    |////|
+      +--(1,3)  +--(3,3)
+    """
     metadata = base_position_metadata()
 
     if corner == "top_left":
@@ -32,22 +46,32 @@ def get_fpdf_coordinates(corner):
     elif corner == "bottom_left":
         metadata.update({Info.X1: 0, Info.Y1: 200, Info.X2: 100, Info.Y2: 300})
 
+    elif corner == "bottom_right":
+        metadata.update({Info.X1: 200, Info.Y1: 200, Info.X2: 300, Info.Y2: 300})
+
+    elif corner == "top_right":
+        metadata.update({Info.X1: 200, Info.Y1: 0, Info.X2: 300, Info.Y2: 100})
+
+    else:
+        raise ValueError(f"No coordinates specified for corner {corner}.")
+
     return metadata
 
 
 def get_fitz_coordinates(corner):
-    metadata = base_position_metadata()
-
-    if corner == "top_left":
-        metadata.update({Info.X1: 0, Info.Y1: 0, Info.X2: 100, Info.Y2: 100})
-
-    elif corner == "bottom_left":
-        metadata.update({Info.X1: 0, Info.Y1: 200, Info.X2: 100, Info.Y2: 300})
-
-    return metadata
+    return get_fpdf_coordinates(corner)
 
 
 def get_pdfnet_coordinates(corner):
+    """Origin bottom left, y1 <= y2; all coords on page are positive
+      +---(1,3) +--(3,3)
+      |////|    |////|
+    (0,2)--+  (2,2)--+
+
+      +--(1,1)  +--(3,1)
+      |////|    |////|
+    (0,0)--+  (2,0)--+
+    """
     metadata = base_position_metadata()
 
     if corner == "top_left":
@@ -56,6 +80,15 @@ def get_pdfnet_coordinates(corner):
     elif corner == "bottom_left":
         metadata.update({Info.X1: 0, Info.Y1: 0, Info.X2: 100, Info.Y2: 100})
 
+    elif corner == "bottom_right":
+        metadata.update({Info.X1: 200, Info.Y1: 0, Info.X2: 300, Info.Y2: 100})
+
+    elif corner == "top_right":
+        metadata.update({Info.X1: 200, Info.Y1: 200, Info.X2: 300, Info.Y2: 300})
+
+    else:
+        raise ValueError(f"No coordinates specified for corner {corner}.")
+
     return metadata
 
 
@@ -112,7 +145,6 @@ def coordinate_test_page_image(coordinate_test_pdf):
     return pdf2image.convert_from_bytes(coordinate_test_pdf)[0]
 
 
-@pytest.mark.parametrize("corner", ["top_left", "bottom_left"])
 @pytest.mark.parametrize("coordinate_system", ["fpdf"])
 def test_fpdf_coordinate_transformer(position_metadata_in_given_system, position_metadata_in_reference_system):
     """We use FPDF's coordinate system as the reference system (arbitrarily). Hence, FPDFCoordinateTransformer
@@ -128,7 +160,6 @@ def test_fpdf_coordinate_transformer(position_metadata_in_given_system, position
     )
 
 
-@pytest.mark.parametrize("corner", ["top_left", "bottom_left"])
 @pytest.mark.parametrize("coordinate_system", ["fitz"])
 def test_fitz_coordinate_transformer(position_metadata_in_given_system, position_metadata_in_reference_system):
     """How I inferred the transformation:
@@ -147,7 +178,6 @@ def test_fitz_coordinate_transformer(position_metadata_in_given_system, position
     )
 
 
-@pytest.mark.parametrize("corner", ["top_left", "bottom_left"])
 @pytest.mark.parametrize("coordinate_system", ["pdfnet"])
 def test_pdfnet_coordinate_transformer(position_metadata_in_given_system, position_metadata_in_reference_system):
     """How I inferred the transformation: