diff --git a/test/unit_tests/image_stitcher_test.py b/test/unit_tests/image_stitcher_test.py
index e383b10..7e451ec 100644
--- a/test/unit_tests/image_stitcher_test.py
+++ b/test/unit_tests/image_stitcher_test.py
@@ -1,17 +1,73 @@
-from itertools import starmap
+from functools import partial
+from itertools import starmap, chain
+from typing import Iterable, List
 
 import fpdf
 import pytest
-from funcy import merge
+from funcy import merge, second, compose, rpartial
 
 from image_prediction.image_extractor.extractor import ImageMetadataPair
 from image_prediction.info import Info
 from test.conftest import get_base_position_metadata, add_image, random_single_color_image_from_metadata
 from test.utils.stitching import BoxSplitter
+from itertools import groupby
 
 
-# def test_image_stitcher(patches_metadata):
-#     assert Stitcher().stitch(patches)
+def make_getter(key):
+    def getter(pair):
+        return pair.metadata[key]
+
+    return getter
+
+
+def make_coord_getter(c):
+    return {
+        "x1": make_getter(Info.X1),
+        "x2": make_getter(Info.X2),
+        "y1": make_getter(Info.Y1),
+        "y2": make_getter(Info.Y2),
+    }[c]
+
+
+def merge_group(group, axis="y"):
+
+    y1_getter, y2_getter = map(make_coord_getter, ("y1", "y2"))
+
+    group = list(group)
+    current_pair = group.pop(0)
+    for pair in group:
+        if y2_getter(current_pair) == y1_getter(pair):
+            current_box = merge_pair(current_pair, pair)
+
+
+def merge_pair(p1, p2):
+    pass
+
+
+
+class Stitcher:
+
+    @staticmethod
+    def groupby(pairs, coord):
+        coord_getter = make_coord_getter(coord)
+        pairs = sorted(pairs, key=coord_getter)
+        return map(compose(list, second), groupby(pairs, coord_getter))
+
+    def stitch(self, pairs: Iterable[ImageMetadataPair]) -> ImageMetadataPair:
+        groups = self.groupby(pairs, "x1")
+        groups = chain.from_iterable(map(rpartial(self.groupby, "x2"), groups))
+        groups = map(partial(sorted, key=make_coord_getter("y1")), groups)
+        groups = map(merge_group, groups)
+
+
+
+@pytest.mark.parametrize("width", [160])
+@pytest.mark.parametrize("height", [90])
+@pytest.mark.parametrize("page_width", [int(160 * 1.1)])
+@pytest.mark.parametrize("page_height", [int(90 * 1.1)])
+def test_image_stitcher(patches_metadata, base_patch_metadata):
+    # noinspection PyTypeChecker
+    assert Stitcher().stitch(patch_image_metadata_pairs).metadata == base_patch_metadata
 
 
 @pytest.mark.parametrize("width", [160])
@@ -29,9 +85,9 @@ def test_partial_image_metadata_pairs(patch_image_metadata_pairs, page_width, pa
 
 
 @pytest.fixture
-def patch_image_metadata_pairs(patches_metadata):
+def patch_image_metadata_pairs(patches_metadata) -> List[ImageMetadataPair]:
     images = map(random_single_color_image_from_metadata, patches_metadata)
-    return starmap(ImageMetadataPair, zip(images, patches_metadata))
+    return list(starmap(ImageMetadataPair, zip(images, patches_metadata)))
 
 
 @pytest.fixture