diff --git a/Tests/test_image.py b/Tests/test_image.py
index c1065d463..cd056d205 100644
--- a/Tests/test_image.py
+++ b/Tests/test_image.py
@@ -1087,6 +1087,3 @@ class TestRegistry:
     def test_encode_registry_fail(self) -> None:
         with pytest.raises(OSError):
             Image._getencoder("RGB", "DoesNotExist", ("args",), extra=("extra",))
-
-
-
diff --git a/Tests/test_image_merge.py b/Tests/test_image_merge.py
index 40e198623..21b8a1bfd 100644
--- a/Tests/test_image_merge.py
+++ b/Tests/test_image_merge.py
@@ -2,6 +2,11 @@ import pytest
 
 from PIL import Image
 
+def calculate_branch_coverage():
+    b = Image.Branches
+    print("Branches covered:", sum(b.values()))
+
+
 def test_merge_wrong_number_of_bands():
     R = Image.new('L', (100, 100), color=255)
     G = Image.new('L', (100, 100), color=128)
@@ -22,4 +27,4 @@ def test_merge_size_mismatch():
     with pytest.raises(ValueError, match="size mismatch"):
         Image.merge('RGB', [R, G, B])
 
-        
+
diff --git a/conftest.py b/conftest.py
index 5fda4f477..9fb8731fb 100644
--- a/conftest.py
+++ b/conftest.py
@@ -1,3 +1,43 @@
 from __future__ import annotations
+import pytest
+import sys
+
+from PIL import Image
 
 pytest_plugins = ["Tests.helper"]
+
+
+def calculate_coverage(test_name):
+    branch = Image.branches
+    branches = Image.branches
+    num_branches = len(branches)
+    branch_covered = {key: value for key, value in branches.items() if value is True}
+    sum_branches = len(branch_covered)
+    coverage = (sum_branches/num_branches) * 100
+    print(f"\nBranches covered: {sum_branches}")
+    print(f"\nTotal branches: {num_branches}")
+    print("\nBRANCH COVERAGE:", coverage, "%\n")
+    return coverage
+
+
+
+@pytest.hookimpl(tryfirst=True)
+def pytest_runtest_protocol(item, nextitem):
+    global test_name
+
+    last_arg = sys.argv[-1]
+
+    test_name = last_arg.split('/')[-1].split('::')[-1]
+
+    test_name = test_name.rstrip('.py')
+
+    return None
+
+@pytest.hookimpl(tryfirst=True)
+def pytest_sessionfinish(session, exitstatus):
+    global test_name
+
+    coverage = calculate_coverage(test_name)
+    print("\nBRANCH COVERAGE for", test_name, ":", coverage, "%\n")
+
+    
\ No newline at end of file
diff --git a/coveragetool.py b/coveragetool.py
deleted file mode 100644
index 60b74e26e..000000000
--- a/coveragetool.py
+++ /dev/null
@@ -1,22 +0,0 @@
-from PIL import Image 
-from PIL.Image import branches
-
-# Define a function to calculate and print branch coverage
-
-
-def calculate_branch_coverage():
-    num_branches = len(branches)
-    branch_covered = {key: value for key, value in branches.items() if value is True}
-    sum_branches = len(branch_covered)
-    coverage = (sum_branches/num_branches) * 100
-    print(f"Branches covered: {sum_branches}")
-    print(f"Total branches: {num_branches}")
-    print("\nBRANCH COVERAGE:", coverage, "%\n")
-
-R = Image.new('L', (100, 100), color=255)
-G = Image.new('L', (100, 100), color=128)  
-B = Image.new('L', (100, 100), color=0)
-merged_image = Image.merge('RGB', (R, G, B))
-merged_image.save('merged_image.png')
-
-calculate_branch_coverage()
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 947deeb78..315b65851 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -75,14 +75,6 @@ class DecompressionBombWarning(RuntimeWarning):
 class DecompressionBombError(Exception):
     pass
 
-branches = {
-    "1": False,
-    "2": False,
-    "3": False,
-    "4": False,
-    "5": False,
-}
-
 
 # Limit to around a quarter gigabyte for a 24-bit (3 bpp) image
 MAX_IMAGE_PIXELS: int | None = int(1024 * 1024 * 1024 // 4 // 3)
@@ -545,6 +537,14 @@ class Image:
         self.pyaccess = None
         self._exif = None
 
+    branches = {
+        "1": False,
+        "2": False,
+        "3": False,
+        "4": False,
+        "5": False,
+        }
+
     @property
     def width(self) -> int:
         return self.size[0]
@@ -594,6 +594,7 @@ class Image:
                 self._close_fp()
             self.fp = None
 
+
     def close(self) -> None:
         """
         Closes the file pointer, if possible.