diff --git a/py-polars/tests/unit/io/test_csv.py b/py-polars/tests/unit/io/test_csv.py
index 49df41ce4795..0afa8b30b3cd 100644
--- a/py-polars/tests/unit/io/test_csv.py
+++ b/py-polars/tests/unit/io/test_csv.py
@@ -728,6 +728,7 @@ def test_write_csv_delimiter() -> None:
     df.write_csv(f, separator="\t")
     f.seek(0)
     assert f.read() == b"a\tb\n1\t1\n2\t2\n3\t3\n"
+    assert_frame_equal(df, pl.read_csv(f, separator="\t"))
 
 
 def test_write_csv_line_terminator() -> None:
@@ -736,6 +737,7 @@ def test_write_csv_line_terminator() -> None:
     df.write_csv(f, line_terminator="\r\n")
     f.seek(0)
     assert f.read() == b"a,b\r\n1,1\r\n2,2\r\n3,3\r\n"
+    assert_frame_equal(df, pl.read_csv(f, eol_char="\n"))
 
 
 def test_escaped_null_values() -> None:
diff --git a/py-polars/tests/unit/namespaces/conftest.py b/py-polars/tests/unit/namespaces/conftest.py
new file mode 100644
index 000000000000..9aa3a121a35d
--- /dev/null
+++ b/py-polars/tests/unit/namespaces/conftest.py
@@ -0,0 +1,10 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+
+@pytest.fixture()
+def namespace_files_path() -> Path:
+    return Path(__file__).parent / "files"
diff --git a/py-polars/tests/unit/namespaces/test_tree_fmt.txt b/py-polars/tests/unit/namespaces/files/test_tree_fmt.txt
similarity index 100%
rename from py-polars/tests/unit/namespaces/test_tree_fmt.txt
rename to py-polars/tests/unit/namespaces/files/test_tree_fmt.txt
diff --git a/py-polars/tests/unit/namespaces/test_meta.py b/py-polars/tests/unit/namespaces/test_meta.py
index 21e7e6671296..b8c79b056bd3 100644
--- a/py-polars/tests/unit/namespaces/test_meta.py
+++ b/py-polars/tests/unit/namespaces/test_meta.py
@@ -1,11 +1,14 @@
 from __future__ import annotations
 
-from pathlib import Path
+from typing import TYPE_CHECKING
 
 import pytest
 
 import polars as pl
 
+if TYPE_CHECKING:
+    from pathlib import Path
+
 
 def test_meta_pop_and_cmp() -> None:
     e = pl.col("foo").alias("bar")
@@ -70,10 +73,8 @@ def test_meta_is_regex_projection() -> None:
     assert e.meta.has_multiple_outputs()
 
 
-def test_meta_tree_format() -> None:
-    with Path("tests/unit/namespaces/test_tree_fmt.txt").open(
-        "r", encoding="utf-8"
-    ) as f:
+def test_meta_tree_format(namespace_files_path: Path) -> None:
+    with (namespace_files_path / "test_tree_fmt.txt").open("r", encoding="utf-8") as f:
         test_sets = f.read().split("---")
     for test_set in test_sets:
         expression = test_set.strip().split("\n")[0]