diff --git a/src/borg/selftest.py b/src/borg/selftest.py
index 1431fd97d..bab8f89f3 100644
--- a/src/borg/selftest.py
+++ b/src/borg/selftest.py
@@ -22,7 +22,7 @@ import time
 from unittest import TestResult, TestSuite, defaultTestLoader
 
 from .testsuite.crypto_test import CryptoTestCase
-from .testsuite.chunkers.chunker_test import ChunkerTestCase
+from .testsuite.chunkers.buzhash_test import ChunkerTestCase
 
 SELFTEST_CASES = [CryptoTestCase, ChunkerTestCase]
 
diff --git a/src/borg/testsuite/chunkers/chunker_test.py b/src/borg/testsuite/chunkers/buzhash_test.py
similarity index 57%
rename from src/borg/testsuite/chunkers/chunker_test.py
rename to src/borg/testsuite/chunkers/buzhash_test.py
index b9ec66f4b..1c6337047 100644
--- a/src/borg/testsuite/chunkers/chunker_test.py
+++ b/src/borg/testsuite/chunkers/buzhash_test.py
@@ -4,66 +4,12 @@
 from io import BytesIO
 
 from ...chunkers import get_chunker
-from ...chunkers.fixed import ChunkerFixed
 from ...chunkers.buzhash import buzhash, buzhash_update, Chunker
 from ...constants import *  # NOQA
 from .. import BaseTestCase
 from . import cf
 
 
-class ChunkerFixedTestCase(BaseTestCase):
-    def test_chunkify_just_blocks(self):
-        data = b"foobar" * 1500
-        chunker = ChunkerFixed(4096)
-        parts = cf(chunker.chunkify(BytesIO(data)))
-        self.assert_equal(parts, [data[0:4096], data[4096:8192], data[8192:]])
-
-    def test_chunkify_header_and_blocks(self):
-        data = b"foobar" * 1500
-        chunker = ChunkerFixed(4096, 123)
-        parts = cf(chunker.chunkify(BytesIO(data)))
-        self.assert_equal(
-            parts, [data[0:123], data[123 : 123 + 4096], data[123 + 4096 : 123 + 8192], data[123 + 8192 :]]
-        )
-
-    def test_chunkify_just_blocks_fmap_complete(self):
-        data = b"foobar" * 1500
-        chunker = ChunkerFixed(4096)
-        fmap = [(0, 4096, True), (4096, 8192, True), (8192, 99999999, True)]
-        parts = cf(chunker.chunkify(BytesIO(data), fmap=fmap))
-        self.assert_equal(parts, [data[0:4096], data[4096:8192], data[8192:]])
-
-    def test_chunkify_header_and_blocks_fmap_complete(self):
-        data = b"foobar" * 1500
-        chunker = ChunkerFixed(4096, 123)
-        fmap = [(0, 123, True), (123, 4096, True), (123 + 4096, 4096, True), (123 + 8192, 4096, True)]
-        parts = cf(chunker.chunkify(BytesIO(data), fmap=fmap))
-        self.assert_equal(
-            parts, [data[0:123], data[123 : 123 + 4096], data[123 + 4096 : 123 + 8192], data[123 + 8192 :]]
-        )
-
-    def test_chunkify_header_and_blocks_fmap_zeros(self):
-        data = b"H" * 123 + b"_" * 4096 + b"X" * 4096 + b"_" * 4096
-        chunker = ChunkerFixed(4096, 123)
-        fmap = [(0, 123, True), (123, 4096, False), (123 + 4096, 4096, True), (123 + 8192, 4096, False)]
-        parts = cf(chunker.chunkify(BytesIO(data), fmap=fmap))
-        # because we marked the '_' ranges as holes, we will get hole ranges instead!
-        self.assert_equal(parts, [data[0:123], 4096, data[123 + 4096 : 123 + 8192], 4096])
-
-    def test_chunkify_header_and_blocks_fmap_partial(self):
-        data = b"H" * 123 + b"_" * 4096 + b"X" * 4096 + b"_" * 4096
-        chunker = ChunkerFixed(4096, 123)
-        fmap = [
-            (0, 123, True),
-            # (123, 4096, False),
-            (123 + 4096, 4096, True),
-            # (123+8192, 4096, False),
-        ]
-        parts = cf(chunker.chunkify(BytesIO(data), fmap=fmap))
-        # because we left out the '_' ranges from the fmap, we will not get them at all!
-        self.assert_equal(parts, [data[0:123], data[123 + 4096 : 123 + 8192]])
-
-
 class ChunkerTestCase(BaseTestCase):
     def test_chunkify(self):
         data = b"0" * int(1.5 * (1 << CHUNK_MAX_EXP)) + b"Y"
diff --git a/src/borg/testsuite/chunkers/chunker_pytest_test.py b/src/borg/testsuite/chunkers/chunker_pytest_test.py
index 470c7ef74..d2cf83c1c 100644
--- a/src/borg/testsuite/chunkers/chunker_pytest_test.py
+++ b/src/borg/testsuite/chunkers/chunker_pytest_test.py
@@ -4,7 +4,7 @@ import tempfile
 
 import pytest
 
-from .chunker_test import cf
+from . import cf
 from ...chunkers import (
     Chunker,
     ChunkerFixed,
diff --git a/src/borg/testsuite/chunkers/chunker_slow_test.py b/src/borg/testsuite/chunkers/chunker_slow_test.py
index 6eac5b4a2..8f436ec2d 100644
--- a/src/borg/testsuite/chunkers/chunker_slow_test.py
+++ b/src/borg/testsuite/chunkers/chunker_slow_test.py
@@ -1,7 +1,7 @@
 from hashlib import sha256
 from io import BytesIO
 
-from .chunker_test import cf
+from . import cf
 from ...chunkers import Chunker
 from ...constants import *  # NOQA
 from ...helpers import hex_to_bin
diff --git a/src/borg/testsuite/chunkers/fixed_test.py b/src/borg/testsuite/chunkers/fixed_test.py
new file mode 100644
index 000000000..14d8a92da
--- /dev/null
+++ b/src/borg/testsuite/chunkers/fixed_test.py
@@ -0,0 +1,59 @@
+from io import BytesIO
+
+from ...chunkers.fixed import ChunkerFixed
+from ...constants import *  # NOQA
+from .. import BaseTestCase
+from . import cf
+
+
+class ChunkerFixedTestCase(BaseTestCase):
+    def test_chunkify_just_blocks(self):
+        data = b"foobar" * 1500
+        chunker = ChunkerFixed(4096)
+        parts = cf(chunker.chunkify(BytesIO(data)))
+        self.assert_equal(parts, [data[0:4096], data[4096:8192], data[8192:]])
+
+    def test_chunkify_header_and_blocks(self):
+        data = b"foobar" * 1500
+        chunker = ChunkerFixed(4096, 123)
+        parts = cf(chunker.chunkify(BytesIO(data)))
+        self.assert_equal(
+            parts, [data[0:123], data[123 : 123 + 4096], data[123 + 4096 : 123 + 8192], data[123 + 8192 :]]
+        )
+
+    def test_chunkify_just_blocks_fmap_complete(self):
+        data = b"foobar" * 1500
+        chunker = ChunkerFixed(4096)
+        fmap = [(0, 4096, True), (4096, 8192, True), (8192, 99999999, True)]
+        parts = cf(chunker.chunkify(BytesIO(data), fmap=fmap))
+        self.assert_equal(parts, [data[0:4096], data[4096:8192], data[8192:]])
+
+    def test_chunkify_header_and_blocks_fmap_complete(self):
+        data = b"foobar" * 1500
+        chunker = ChunkerFixed(4096, 123)
+        fmap = [(0, 123, True), (123, 4096, True), (123 + 4096, 4096, True), (123 + 8192, 4096, True)]
+        parts = cf(chunker.chunkify(BytesIO(data), fmap=fmap))
+        self.assert_equal(
+            parts, [data[0:123], data[123 : 123 + 4096], data[123 + 4096 : 123 + 8192], data[123 + 8192 :]]
+        )
+
+    def test_chunkify_header_and_blocks_fmap_zeros(self):
+        data = b"H" * 123 + b"_" * 4096 + b"X" * 4096 + b"_" * 4096
+        chunker = ChunkerFixed(4096, 123)
+        fmap = [(0, 123, True), (123, 4096, False), (123 + 4096, 4096, True), (123 + 8192, 4096, False)]
+        parts = cf(chunker.chunkify(BytesIO(data), fmap=fmap))
+        # because we marked the '_' ranges as holes, we will get hole ranges instead!
+        self.assert_equal(parts, [data[0:123], 4096, data[123 + 4096 : 123 + 8192], 4096])
+
+    def test_chunkify_header_and_blocks_fmap_partial(self):
+        data = b"H" * 123 + b"_" * 4096 + b"X" * 4096 + b"_" * 4096
+        chunker = ChunkerFixed(4096, 123)
+        fmap = [
+            (0, 123, True),
+            # (123, 4096, False),
+            (123 + 4096, 4096, True),
+            # (123+8192, 4096, False),
+        ]
+        parts = cf(chunker.chunkify(BytesIO(data), fmap=fmap))
+        # because we left out the '_' ranges from the fmap, we will not get them at all!
+        self.assert_equal(parts, [data[0:123], data[123 + 4096 : 123 + 8192]])