diff --git a/testing/code/test_terminal_writer.py b/testing/code/test_terminal_writer.py
deleted file mode 100644
index 01da3c235..000000000
--- a/testing/code/test_terminal_writer.py
+++ /dev/null
@@ -1,28 +0,0 @@
-import re
-from io import StringIO
-
-import pytest
-from _pytest._io import TerminalWriter
-
-
-@pytest.mark.parametrize(
-    "has_markup, expected",
-    [
-        pytest.param(
-            True, "{kw}assert{hl-reset} {number}0{hl-reset}\n", id="with markup"
-        ),
-        pytest.param(False, "assert 0\n", id="no markup"),
-    ],
-)
-def test_code_highlight(has_markup, expected, color_mapping):
-    f = StringIO()
-    tw = TerminalWriter(f)
-    tw.hasmarkup = has_markup
-    tw._write_source(["assert 0"])
-    assert f.getvalue().splitlines(keepends=True) == color_mapping.format([expected])
-
-    with pytest.raises(
-        ValueError,
-        match=re.escape("indents size (2) should have same size as lines (1)"),
-    ):
-        tw._write_source(["assert 0"], [" ", " "])
diff --git a/testing/io/test_terminalwriter.py b/testing/io/test_terminalwriter.py
index 1e4f04ac0..b3bd9cfae 100644
--- a/testing/io/test_terminalwriter.py
+++ b/testing/io/test_terminalwriter.py
@@ -1,5 +1,6 @@
 import io
 import os
+import re
 import shutil
 import sys
 from typing import Generator
@@ -207,3 +208,26 @@ class TestTerminalWriterLineWidth:
         assert len(text) == 10
         tw.write(text)
         assert tw.width_of_current_line == 9
+
+
+@pytest.mark.parametrize(
+    "has_markup, expected",
+    [
+        pytest.param(
+            True, "{kw}assert{hl-reset} {number}0{hl-reset}\n", id="with markup"
+        ),
+        pytest.param(False, "assert 0\n", id="no markup"),
+    ],
+)
+def test_code_highlight(has_markup, expected, color_mapping):
+    f = io.StringIO()
+    tw = terminalwriter.TerminalWriter(f)
+    tw.hasmarkup = has_markup
+    tw._write_source(["assert 0"])
+    assert f.getvalue().splitlines(keepends=True) == color_mapping.format([expected])
+
+    with pytest.raises(
+        ValueError,
+        match=re.escape("indents size (2) should have same size as lines (1)"),
+    ):
+        tw._write_source(["assert 0"], [" ", " "])