diff --git a/tests/test_debug.py b/tests/test_debug.py
new file mode 100644
index 0000000..f2a2c79
--- /dev/null
+++ b/tests/test_debug.py
@@ -0,0 +1,35 @@
+from plasma.debug import draw, tree, info
+
+
+class TestDebugging:
+
+    def test_tree(self, root, grid):
+        lines = tree(root).split('\n')
+        assert lines[0].startswith('root')
+        assert lines[1].strip().startswith('a')
+        assert lines[2].strip().startswith('*')
+        assert lines[3].strip().startswith('b')
+
+    def test_draw(self, root, grid):
+        a, *_ = grid
+        root._width = 24
+        root._height = 10
+        a.payload = 'XXXXXXXXXXXX'
+        data = draw(root)
+        assert data == '''
+        ┌──────────┐┌──────────┐
+        │XXXXXXXXXX││b.........│
+        │..........││..........│
+        │..........││..........│
+        │..........│└──────────┘
+        │..........│┌──┐┌──┐┌──┐
+        │..........││c.││d.││e.│
+        │..........││..││..││..│
+        │..........││..││..││..│
+        └──────────┘└──┘└──┘└──┘
+        '''.replace(' ', '')[1:]
+
+    def test_info(self, root, grid, capsys):
+        info(root)
+        out, _ = capsys.readouterr()
+        assert out == tree(root) + '\n' + draw(root) + '\n'
diff --git a/tests/test_plasma.py b/tests/test_plasma.py
index 7c23cad..0fd7197 100644
--- a/tests/test_plasma.py
+++ b/tests/test_plasma.py
@@ -1007,35 +1007,3 @@ def test_restore_keep_flexible(self, root, tiny_grid):
         assert b._size is None
         assert c._size == 10
 
-class TestDebugging:
-
-    def test_tree(self, root, grid):
-        lines = tree(root).split('\n')
-        assert lines[0].startswith('root')
-        assert lines[1].strip().startswith('a')
-        assert lines[2].strip().startswith('*')
-        assert lines[3].strip().startswith('b')
-
-    def test_draw(self, root, grid):
-        a, *_ = grid
-        root._width = 24
-        root._height = 10
-        a.payload = 'XXXXXXXXXXXX'
-        data = draw(root)
-        assert data == '''
-        ┌──────────┐┌──────────┐
-        │XXXXXXXXXX││b.........│
-        │..........││..........│
-        │..........││..........│
-        │..........│└──────────┘
-        │..........│┌──┐┌──┐┌──┐
-        │..........││c.││d.││e.│
-        │..........││..││..││..│
-        │..........││..││..││..│
-        └──────────┘└──┘└──┘└──┘
-        '''.replace(' ', '')[1:]
-
-    def test_info(self, root, grid, capsys):
-        info(root)
-        out, _ = capsys.readouterr()
-        assert out == tree(root) + '\n' + draw(root) + '\n'